A method and system for wireless connection of multi-terminal intercommunication of a card manufacturing machine

Abstract

The application discloses a kind of card making machine multi-terminal intercommunication wireless connection method and system, belong to card making technical field, in this method, flat end built-in identity card module and communicate with card making end by wireless network, card making end built-in Android system, by fixed wiring harness direct connection card making equipment and with card making equipment share same power harness power supply and fixed placement;Through the steps such as broadcast discovery, network connection establishment, instruction issuing execution and result return, wireless intercommunication between mobile front end and fixed back end in card making service is realized, the technical problems of power supply shortage, interface conflict, frequent plugging and mobility limitation under traditional USB direct connection mode are solved, and it is suitable for on-site instant production scene of various cards such as social security card, bank card and the like.

Description

Technical Field

[0001] This invention relates to the field of card production technology, specifically to a wireless connection method and system for multi-terminal interconnection of card production machines. Background Technology

[0002] A card-making machine is a specialized terminal device used to produce various types of cards. It integrates card printing, chip writing, magnetic stripe encoding, and identity verification functions, and is widely used in government service halls, bank branches, social security agencies, and other locations. Traditional card-making systems typically use desktop or laptop computers as control terminals, connecting to card printers, ID card readers, magnetic stripe readers, and contact and contactless smart card readers via USB interfaces. Operators install the drivers for each device and run the card-making software on the computer to complete identity verification, data collection, and card-making command issuance. With the development of mobile internet technology and the increasing demand for on-site, real-time card production in government and financial services, the traditional fixed card-making model based on desktop or laptop computers has gradually revealed the following technical problems.

[0003] The limited power supply capacity of USB interfaces makes it difficult to meet the stable operation requirements of multiple card-making devices simultaneously. According to the USB 2.0 specification, the standard USB interface has a maximum current limit of 500mA and a voltage range of 4.4V to 5.25V. In practical applications, the power consumption requirements of various card-making devices differ. Card printers, for example, require driving stepper motors to feed cards, rotating ribbons, and heating the printhead during operation, and their instantaneous operating current often exceeds the power supply capacity of the standard USB interface. When multiple card-making devices are connected to the same computer simultaneously, the total power supply capacity of the USB interface is distributed among the devices, leading to problems such as insufficient power supply, instability, or frequent disconnections for some devices. While existing technologies using USB hubs with independent power supplies can alleviate the power shortage to some extent, their deployment is complex and costly, and they do not fundamentally eliminate the stability risks caused by the USB power supply bottleneck.

[0004] The signal quality of USB interfaces is significantly affected by factors such as cable length and electromagnetic interference. In scenarios where card manufacturing equipment is distributed across different areas, USB cables need to be stretched and pass through various regions, making the signal susceptible to attenuation and distortion during transmission. When multiple high-power devices are connected to the same bus via a USB hub, the theoretical maximum bus bandwidth of 480Mbps for the USB 2.0 interface is prone to saturation, leading to data transmission interruptions or sudden drops in speed, directly impacting card manufacturing efficiency and success rate.

[0005] Excessive system resource consumption and frequent interface conflicts are observed. Different types of card-making equipment require their own drivers, and multiple drivers and background monitoring services simultaneously consume CPU and memory resources. During system startup, the initialization process of numerous peripherals prolongs boot time. Under Windows operating systems, when multiple devices are connected to the same USB hub, the operating system's selective suspend mechanism may cause some devices to be incorrectly recognized or experience response delays. When multiple devices are connected to a USB hub, the uncertainty of device recognition order and resource allocation can easily lead to interface conflicts and driver loading failures, requiring frequent unplugging and replugging of devices to restore connectivity.

[0006] Furthermore, frequent plugging and unplugging causes physical wear and tear on USB interfaces, affecting the long-term reliability of the system. In traditional office settings, card-making equipment, computers, and various peripherals are frequently plugged and unplugged due to site adjustments, equipment replacements, or personnel relocation. According to connector reliability analysis, frequent plugging and unplugging can cause fatigue in the contact contacts, leading to reduced contact area after plating wear, further resulting in unstable conductivity. This is particularly common in USB interfaces, board-to-board connectors, and test fixtures. For older devices using Type-A interfaces, improper insertion orientation and pulling on the cable can also accelerate physical damage to the interface, leading to poor contact and communication abnormalities. In high-frequency usage scenarios such as bank counters and social security service halls, these physical wear and tear issues further exacerbate system maintenance costs.

[0007] Regarding the mobilization of card-making systems, existing technologies have attempted to combine card-making equipment with mobile terminals. For example, one type of smart card printer integrates an Android industrial control board and a wireless communication module, using the wireless communication module to achieve wireless communication with a mobile terminal, enabling the smart card printer to interconnect with the mobile terminal's network. However, this solution highly integrates all functions within the printer, making it an all-in-one smart device. Although it achieves wireless connection between the mobile terminal and the printer, it is primarily geared towards a single printing scenario. For complex business scenarios requiring simultaneous connection to multiple card-making devices, such as using ID card readers, magnetic stripe readers, and contact and contactless smart card readers simultaneously, this solution still suffers from limited integration and difficulty in expanding to multiple devices. Another technical solution uses an industrial control computer on the card issuer to communicate with a cloud server via a 5G module, utilizing the cloud for card issuance data management and distribution. This solution centrally manages the scheduling of card-making tasks and data processing in the cloud, making it suitable for large-scale remote distributed deployment scenarios. However, unlike the local offline card-making scenario focused on in this invention, this solution heavily relies on external network connectivity and cannot function properly when the network is interrupted or the signal is poor. Meanwhile, this solution also failed to solve technical problems such as insufficient power supply, interface conflicts, and physical plug-and-play losses between the mobile terminal and the card-making terminal.

[0008] In summary, existing card-making systems still have shortcomings in terms of power supply stability, interface reliability, system resource consumption, and device mobility. How to ensure the portability of the card-making system while resolving power supply bottlenecks, interface conflicts, and physical losses when multiple devices are connected is a technical challenge that urgently needs to be addressed by those skilled in the art. Summary of the Invention

[0009] In order to overcome the problems of the prior art, the present invention discloses a wireless connection method and system for multi-terminal interoperability of a card making machine.

[0010] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: A wireless connection method for multi-terminal interoperability of a card making machine is applied to a system including a tablet terminal and a card making terminal. The tablet terminal has a built-in ID card module and communicates with the card making terminal through a wireless network. The card-making terminal has a built-in Android system and is directly connected to the card-making equipment via a fixed wiring harness. The card-making terminal and the card-making equipment are powered by the same power wiring harness and are fixedly placed. The method includes the following steps: S1, the card-making terminal broadcasts identity information in all connectable networks to search for the tablet terminal. After the tablet terminal starts up, it receives broadcasts from all receiveable networks to search for the card-making terminal. S2, when the tablet receives the broadcast, the tablet establishes a network communication connection with the card-making terminal, and the card-making terminal exits the broadcast loop after receiving the network communication request; S3: The tablet sends card production operation instructions to the card production terminal via network communication. S4, the card-making terminal receives the card-making operation instruction and controls the card-making equipment directly connected to the card-making terminal to perform the corresponding card-making operation; S5, the card-making end sends the operation result of the card-making operation back to the tablet end; S6: The tablet receives the operation results and feeds them back to the operator. The card-making terminal maintains a network communication connection with the tablet and waits to receive new card-making operation instructions.

[0011] Preferably, the built-in ID card module on the tablet is used to verify identity before performing step S3.

[0012] Preferably, the card-making equipment directly connected to the card-making end via a fixed wiring harness includes at least a card printer and an ID card reader. The fixed placement of the card-making end reduces the number of times the physical interface needs to be plugged and unplugged.

[0013] Preferably, after establishing the network communication connection in step S2, the method further includes a step of obtaining the battery status: The card-making terminal obtains the remaining battery power information of the tablet terminal and compares it with at least one preset power threshold. When the remaining battery power is lower than the first threshold, the terminal performs load offloading processing on the received card-making operation command. The load offloading process includes the card-making terminal receiving the metadata of at least one card-making operation task cached on the tablet terminal at one time, storing it in the local task queue of the card-making terminal, and instructing the tablet terminal to enter a low-power mode. While the tablet terminal is in a low-power mode, the card-making terminal continues to execute the card-making operations in the task queue. After the execution is completed, the tablet terminal is woken up and the results are sent back.

[0014] Preferably, after establishing the network communication connection in step S2, the method further includes connection keep-alive and breakpoint resume steps: The card-making terminal and the tablet terminal negotiate the initial heartbeat interval and monitor network status parameters in real time, including packet loss rate and / or round-trip time jitter. The card-making end dynamically adjusts the heartbeat interval based on network status parameters. When the packet loss rate is lower than the first packet loss rate threshold and the round-trip time jitter value is lower than the first jitter threshold, the heartbeat interval is increased. When the packet loss rate is higher than the second packet loss rate threshold or the round-trip time jitter is higher than the second jitter threshold, reduce the heartbeat interval; When the heartbeat timeout occurs for a preset number of consecutive times, the connection is determined to be broken. The card-making end pauses the current card-making operation and saves the breakpoint information. At the same time, step S1 is re-executed to enter the broadcast search state. The tablet automatically re-executes the broadcast reception and reconnection steps. After reconnection, the card-making terminal continues the card-making operation from the point of breakpoint based on the breakpoint information.

[0015] Preferably, in step S3, the tablet terminal assigns a globally unique instruction identifier to each instruction when issuing the card production operation instruction; The card-making end maintains a historical list of executed instruction identifiers and queries the historical list based on the instruction identifier after receiving an instruction: If the identifier already exists, the card-making terminal retrieves the result of the last execution of the instruction from the local cache and sends it back to the tablet terminal; If the identifier does not exist, the card making operation is performed, the identifier is stored in the history list, and the execution result is stored. The historical list uses a first-in-first-out (FIFO) strategy to limit its storage length.

[0016] Preferably, the card-making equipment directly connected to the card-making terminal via a wired connection also includes at least one of the following: a magnetic stripe reader / writer, a contact smart card reader / writer, or a contactless smart card reader / writer.

[0017] Preferably, when at least two tablets establish network communication connections with the same card-making terminal, the card-making terminal maintains a dynamic task queue, and each entry in the dynamic task queue includes at least the unique identifier of the tablet, the request time, the service type, and the priority level. The card-making end determines the execution order of tasks in the queue based on priority level and the pre-execution time of the card-making operation instruction, with tasks with shorter execution times being executed before those with longer execution times; When the card-making terminal processes an instruction, it sends queuing status information to other requesting tablet terminals. The queuing status information includes the queue length and the estimated waiting time.

[0018] Preferably, the card-making terminal acquires the status information of its directly connected card-making equipment during idle periods. The status information includes at least one of ribbon remaining amount, printhead temperature, and paper jam status. The card-making terminal pushes status information to the tablet terminal for display via network communication.

[0019] On the other hand, a wireless connection system for multi-terminal interoperability of card issuing machines is provided, including: On the tablet, which has a built-in ID card module, it communicates with the card-making terminal via a wireless network. After starting up, it receives broadcasts from all available networks to find the card-making terminal, establishes a network communication connection with the card-making terminal, issues card-making operation instructions, and receives and feeds back the operation results. The card-making terminal, with a built-in Android system, is directly connected to card-making equipment, including at least a card printer, via a fixed cable harness. The card-making terminal and the card-making equipment share the same power cable harness and are fixedly placed. The card-making terminal is used to cyclically broadcast identity information to search for the tablet terminal in all connectable networks. In response to the network communication request from the tablet terminal, it establishes a network communication connection with it and exits the broadcast loop. It receives card-making operation instructions from the tablet terminal, controls the card-making equipment to execute the corresponding card-making operation, and sends the operation results back to the tablet terminal. After sending back the results, it maintains a network communication connection with the tablet terminal to wait for new instructions.

[0020] The beneficial effects of this invention are as follows: Compared with the prior art, the technical solution provided by the present invention has the following significant advantages: This invention separates the tablet end from the card-making end. The tablet end uses wireless network communication and has a built-in ID card module, while the card-making end uses a fixed wiring harness to directly connect to the card-making equipment and shares the same power wiring harness with the card-making equipment. This completely avoids the problem of insufficient power supply when multiple card-making devices are connected to a mobile terminal via USB interface, and eliminates the hidden dangers of device recognition failure, unstable operation and frequent disconnection caused by limited power supply capacity. By fixing the card-making terminal and directly connecting it to the card-making equipment with a fixed cable harness, the physical connection between the card-making terminal and each card-making device no longer needs to be plugged in or unplugged after deployment. This fundamentally solves the problems of physical wear, poor contact and interface damage of USB interface caused by frequent plugging and unplugging, and significantly improves the long-term reliability of the system in high-frequency usage scenarios such as bank counters and social security service halls. The card-making terminal uses a built-in Android system to manage all card-making devices directly connected to it. The tablet only needs to send commands via wireless network to complete various card-making operations, eliminating the need to install various drivers and background monitoring services on the tablet. This reduces the system resource consumption of the tablet, shortens the device startup time, and avoids interface conflicts and driver loading failures caused by the selective suspension mechanism of the operating system or the uncertainty of USB hub resource allocation. By embedding the ID card module into the tablet, operators can complete identity verification without having to carry their ID cards to a fixed card-making terminal. Combined with wireless communication between the tablet and the card-making terminal, the identity verification process is fully mobile, improving the flexibility and convenience of on-site instant card-making services. By actively acquiring and pushing equipment status information such as ribbon remaining amount, printhead temperature, and paper jam status to the tablet during idle periods, operators can remotely monitor the operation of the card making equipment without having to visit the card making terminal in person, thus reducing equipment inspection costs and minimizing card making interruption time caused by consumables running out or equipment failure. By implementing dynamic task queue scheduling, prioritizing short tasks, and providing real-time notification of queuing status when multiple tablets access the system concurrently, the system achieves orderly management of multiple mobile front-ends sharing the same card-making terminal. This avoids conflicts between multiple source commands, improves the overall system response efficiency, and enhances the user experience in multi-person collaborative card-making scenarios.

[0021] It should be noted that all data writing operations in this invention are only for non-ID cards such as social security cards and bank cards, and do not involve writing any data to the ID card chip or magnetic stripe. The ID card reader is only used to read ID card information and does not have any writing function. Attached Figure Description

[0022] Figure 1 This is a flowchart of a wireless connection method for multi-terminal interoperability of a card making machine provided in Embodiment 1 of the present invention; Figure 2 This is a flowchart illustrating a wireless connection system for multi-terminal interoperability of a card making machine, as provided in Embodiment 1 of the present invention. Detailed Implementation

[0023] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, exemplary embodiments will be described in detail below, examples of which are illustrated in the accompanying drawings. In the following description relating to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of methods and systems consistent with some aspects of this application as detailed in the appended claims.

[0024] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a” and “the” as used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0025] The following detailed description of the specific implementation methods, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided in detail. Example 1

[0026] Please refer to Figure 1 This embodiment provides a wireless connection method for multi-terminal interconnection of a card making machine, which is applied to a system including a tablet terminal and a card making terminal. The tablet terminal has a built-in ID card module and communicates with the card making terminal through a wireless network. The card-making terminal has a built-in Android system and is directly connected to the card-making equipment via a fixed wiring harness. The card-making terminal and the card-making equipment are powered by the same power wiring harness and are fixedly placed. The method includes the following steps: S1, the card-making terminal broadcasts its identity information in all connectable networks to search for the tablet terminal. After the tablet terminal starts up, it receives broadcasts from all receivable networks to search for the card-making terminal. In step S1, both the card-making terminal and the tablet terminal are in network listening and broadcasting state, thus achieving mutual discovery. S2, the tablet receives the broadcast and establishes a network communication connection with the card-making terminal. After receiving the network communication request, the card-making terminal exits the broadcast loop. At this time, the wireless communication link between the two is officially established, and the card-making terminal stops broadcasting to avoid wasting network resources. S3, the tablet sends card production operation instructions to the card production terminal via network communication. The card production operation instructions can include various business instructions such as new card application, card replacement, social security card activation, password modification, card loss reporting, and card replacement with the same number. S4, the card-making terminal receives the card-making operation instruction and controls the card-making equipment directly connected to the card-making terminal to perform the corresponding card-making operation. The card-making equipment includes card printers, ID card readers, magnetic stripe readers, contact or contactless smart card readers, etc. The card-making terminal parses the received instruction and drives the corresponding equipment to complete the card printing, data writing or reading operation. S5, the card-making terminal sends the operation result of the card-making operation back to the tablet terminal. The operation result can be information such as whether the card-making was successful or failed, as well as the reason for failure, error code, etc. S6, the tablet receives the operation results and feeds them back to the operator. The card-making terminal maintains a network communication connection with the tablet and waits to receive new card-making operation instructions. In this way, after a card-making task is completed, the connection is not broken and the card-making terminal remains in standby mode, ready to respond immediately to the next instruction issued by the tablet. Specifically, this invention solves the technical problems of insufficient power supply, interface conflict, frequent plugging and unplugging, and limited mobility in the traditional USB direct connection method by fixing the card-making end in place and sharing the power supply with the card-making equipment, while the tablet end has a built-in ID card module and communicates with the card-making end through a wireless network. It utilizes the process of broadcast discovery, connection establishment, instruction issuance and execution, result feedback and connection maintenance to effectively solve the technical problems of insufficient power supply, interface conflict, frequent plugging and unplugging and limited mobility in the traditional USB direct connection method, and realizes stable and reliable seamless interoperability between multiple ends of the card-making machine.

[0027] Furthermore, before the tablet sends the card-making operation instruction to the card-making terminal via network communication in step S3, the built-in ID card module of the tablet verifies the identity of the operation object; The operator places the ID card to be processed on the ID card reading area of ​​the tablet; The ID card module reads the identity information stored in the ID card, including name, citizen identification number, photo, etc. After the tablet reads the identity information, it compares it with the card issuance qualification data pre-stored in the business system; The comparison process can verify whether the ID card is eligible for services such as new card application, card replacement, or card replacement in a different location; If the verification is successful, the tablet will continue to execute step S3 and issue a card production operation instruction. If the verification fails, the tablet will display a verification failure message on its own screen and terminate the card production process. Specifically, through the above identity verification steps, this invention ensures that only those who have been legally authenticated can trigger the subsequent card-making operation instructions, thereby improving the security and compliance of the card-making business and avoiding the risk of illegal identity theft for card-making business. At the same time, by directly embedding the ID card module into the tablet, the entire identity verification process is not affected by the fixed position of the card-making terminal. Operators can complete the verification in mobile scenarios by holding the tablet, further improving the convenience of the business.

[0028] Furthermore, the card-making equipment that is directly connected to the card-making end via a fixed wiring harness includes at least a card printer and an ID card reader; The Android system built into the card-making terminal establishes wired connections with the card printer and the ID card reader through a set of fixed-length wires. Once the equipment is deployed, the fixed wiring harness remains connected and will not be plugged or unplugged. The card-making end sends printing instructions to the card printer through the fixed wiring harness, controlling it to complete the thermal sublimation printing of the card pattern and text. Meanwhile, the card-making terminal is also connected to a contact smart card reader via a fixed wiring harness to write data from the social security card chip into the card.

[0029] The card-making terminal is fixed in place. In actual deployment, the card-making terminal is placed at a fixed workstation in a bank counter, social security service hall or community service point, and its position remains unchanged relative to the ground or desktop. The cable harnesses between the card-making terminal and devices such as card printers and ID card readers are all secured with cable trays or cable ties to prevent the interfaces from becoming loose due to accidental pulling. Specifically, since the card-making end is fixedly placed and directly connected to the card-making equipment using a fixed wiring harness, the number of physical interface plug-and-play cycles for the entire system is almost zero. Compared with the traditional method of frequently plugging and unplugging the card-making equipment to different computers or tablets via USB interface, this invention avoids problems such as physical interface wear, poor contact, and damage to interface clips caused by repeated plugging and unplugging, significantly extending the service life of the hardware equipment, while reducing the probability of card-making failure due to loose interfaces and improving the overall operational stability of the system.

[0030] Furthermore, after establishing a network communication connection between the tablet and the card-making end in step S2, this method also includes a power status acquisition step; The card-making terminal obtains the remaining battery power information from the tablet terminal. The card-making terminal sends a power query request to the tablet terminal through the established network communication connection. In response to the request, the tablet terminal sends back the current percentage or remaining power level of its battery power to the card-making terminal. The remaining battery power information can be a precise remaining percentage, or it can be a level indicator corresponding to low power, normal power, full power, etc. The card-making terminal compares the remaining battery power with at least one preset power threshold and pre-stores one or more power thresholds inside the card-making terminal. The first threshold is a threshold value used to determine whether the tablet terminal has entered a low power state. The first threshold can be set to 20% or 15% of the total battery capacity. The card-making terminal will compare the remaining battery power obtained with the first threshold. When the remaining battery power is lower than the first threshold, the card-making terminal determines that the tablet terminal is in a low power state, and at this time, it performs load offloading processing on the received card-making operation command. The purpose of load offloading is to transfer the computing and communication tasks that originally needed to be continuously performed on the tablet to the card manufacturing end, thereby reducing the power consumption of the tablet. Load offloading includes the following specific operations: The card-making terminal receives metadata for at least one card-making operation task cached on the tablet terminal at a time. When the tablet detects that its remaining battery power is below the first threshold, it does not immediately stop working, but instead caches the card-making operation tasks that have passed identity verification and are ready to be issued locally. Each card-making operation task corresponds to a set of metadata, which includes at least the task type, card-making parameters, card data, and task priority information; The tablet packagees the metadata of at least one card-making operation task in the cache and sends it to the card-making terminal in one go through the network communication connection. The card-making terminal receives the data packet completely. The card-making terminal stores the received metadata into its own local task queue. The Android system built into the card-making terminal has local storage capabilities and maintains a first-in-first-out task queue. The card-making terminal stores the metadata of each card-making operation task received into the task queue in the order of receipt or in the order of priority carried in the metadata. The card-making terminal instructs the tablet terminal to enter low-power mode. After completing the transmission of metadata, the card-making terminal sends a low-power mode command to the tablet terminal through network communication connection. Upon receiving the instruction, the tablet will shut down or reduce the power supply to non-essential modules, including turning off the display backlight, reducing the processor clock speed, and pausing the active scanning function of the wireless network, so that the tablet enters a deep standby or hibernation state to save battery power to the maximum extent.

[0031] The card-making terminal continues to execute card-making operations in the task queue while the tablet is in low-power mode. Because the card-making terminal shares the same power harness with the card-making equipment, it has a continuous and stable power supply and is not limited by battery power. The card-making terminal sequentially retrieves the metadata of each card-making operation task from the local task queue. Based on the card-making parameters and card data in the metadata, it controls the card printer and other card-making equipment directly connected to it to complete the card printing, data writing and other operations one by one. During this process, the tablet remains in a low-power state and does not need to participate in any card manufacturing process.

[0032] After the execution is completed, the card-making terminal wakes up the tablet terminal and sends back the result. When all card-making operation tasks in the local task queue of the card-making terminal have been completed, the card-making terminal sends a wake-up signal to the tablet terminal through network communication connection. The wake-up signal can be a specific format of Wake-up packet or an activation command in a keep-connected state; After receiving the wake-up signal, the tablet exits low-power mode and resumes normal operation of the processor and wireless network module. The card-making terminal packages and sends back the execution results of each card-making operation task, including success or failure status, failure reason, completion time, and other information, to the tablet terminal. After receiving the results, the tablet terminal displays them on the screen for the operator to view. Specifically, through the above-mentioned power status acquisition and load offloading processing, this method makes full use of the advantage of the card-making terminal and the card-making equipment sharing a fixed power supply. When the tablet terminal's power is insufficient, the card-making task is completely transferred to the card-making terminal for execution, enabling the tablet terminal to enter a low-power mode in a timely manner to save power. At the same time, it ensures that the card-making business is not interrupted, effectively solving the contradiction between the limited battery life of the tablet terminal and the power consumption of batch card-making tasks in mobile card-making scenarios, and improving the system's continuous operation capability and user experience.

[0033] Furthermore, after establishing a network communication connection between the tablet end and the card-making end in step S2, this method also includes connection keep-alive and breakpoint resume steps; The card-making end and the tablet end negotiate the initial heartbeat interval. The heartbeat interval refers to the time period during which the card-making end and the tablet end periodically send heartbeat packets to confirm that the connection is still valid. After the initial connection is established, the card-making end sends a negotiation request containing a suggested heartbeat interval value to the tablet end. The tablet end returns an accepted value or a modified value according to its own network policy and power consumption requirements. The two parties finally determine the initial heartbeat interval, which can be set to one second or two seconds. The card-making terminal and tablet terminal monitor network status parameters in real time, including packet loss rate and round-trip time jitter. Packet loss rate refers to the percentage of data packets sent per unit of time that are not successfully received by the other party, expressed as a percentage. Round-trip time jitter is the absolute value of the difference between the round-trip times of two consecutive heartbeat packets, reflecting the stability of network latency. The card-making end can calculate the above parameters by carrying a serial number and timestamp in each heartbeat packet and based on the confirmation packet returned by the tablet end. The card-making terminal dynamically adjusts the heartbeat interval based on network status parameters; The card-making terminal has preset thresholds for a first packet loss rate, a second packet loss rate, a first jitter threshold, and a second jitter threshold. The first packet loss rate threshold is lower than the second packet loss rate threshold, and the first jitter threshold is lower than the second jitter threshold; For example, the first packet loss rate threshold can be set to 1%, and the second packet loss rate threshold can be set to 5%; The first jitter threshold can be set to 10 milliseconds, and the second jitter threshold can be set to 50 milliseconds; When the packet loss rate is lower than the first packet loss rate threshold and the round-trip time jitter is lower than the first jitter threshold, it indicates that the current network quality is excellent and stable. Under this condition, the card-making end increases the heartbeat interval. The increase can be made by increasing in fixed steps, such as 0.5 seconds each time, or by increasing by 20% of the current heartbeat interval. Increasing the heartbeat interval can reduce the heartbeat packets' consumption of network bandwidth and processing resources at both ends, while also reducing the power consumption of the tablet. When the packet loss rate is higher than the second packet loss rate threshold or the round-trip time jitter is higher than the second jitter threshold, it indicates that the current network quality is poor or there is significant fluctuation. In this case, the card-making end reduces the heartbeat interval. The heartbeat interval can be reduced in fixed increments, such as 0.3 seconds each time, or by 10% of the current heartbeat interval. Reducing the heartbeat interval allows for more frequent checks of the connection status, and can detect and trigger the recovery mechanism more quickly if a connection anomaly occurs. The connection is considered broken when the heartbeat timeout occurs after a preset number of consecutive heartbeats. Heartbeat timeout refers to a situation where the card-issuing terminal sends a heartbeat packet but does not receive a confirmation response from the tablet terminal within a specified time window. The preset number of times can be set to three. If three consecutive heartbeats time out, the card-issuing terminal considers the network connection to be interrupted.

[0034] After the connection is determined to be broken, the card-making terminal suspends the current card-making operation and saves the breakpoint information; The current card production operation may be in the process of printing cards or writing data. The card production terminal should immediately stop controlling the card production equipment and record the progress of the currently executed operation as breakpoint information. Breakpoint information includes at least the identifier of the card-making operation instruction currently being processed, the step number that the instruction has already completed, the location of the data that has been written, and the operation parameters that have not yet been executed. Breakpoint information is stored in local non-volatile memory at the card manufacturing end, ensuring that it will not be lost even in the event of a power outage; At the same time, the card-making terminal re-executes step S1 to enter the broadcast search state. The card-making terminal exits the original network communication connection state and begins to broadcast identity information in a loop within all connectable networks to search for available tablet terminals again. The tablet automatically re-executes the broadcast reception and reconnection steps. After detecting that the original network communication connection is broken, the tablet automatically starts the broadcast reception process and rescans the broadcast information sent by the card-making terminal in the network without manual intervention. Once the card-making terminal receives the broadcast, the tablet initiates another network communication request to re-establish a connection with the card-making terminal. After reconnection, the card-making terminal continues the card-making operation from the point of breakpoint based on the breakpoint information; After the card-making end and the tablet end re-establish network communication connection, the card-making end first reads the breakpoint information stored locally to identify the card-making operation that was not completed when the last interruption occurred and its progress. The card-making end requests the missing subsequent instruction parameters from the tablet end based on the operation identifier in the breakpoint information, or directly sends a command to the card-making device to continue execution using the saved parameters. For example, if the breakpoint information shows that the chip data of a social security card has been written for the first eight bytes but the remaining sixteen bytes have not been written, the card-making end will continue writing from the ninth byte without having to re-execute the entire card-making process. This avoids the entire card being rendered unusable or needing to be restarted due to temporary network interruptions, significantly improving the success rate of operations in a wireless card manufacturing environment. Specifically, through the above-mentioned connection keep-alive and breakpoint resume steps, the present invention, in the scenario of unstable wireless network, on the one hand, dynamically adjusts the heartbeat interval to adapt to changes in network quality and reduce unnecessary resource consumption, and on the other hand, can automatically save the progress when the network is unexpectedly disconnected and accurately restore it after reconnection, realizing the breakpoint resume of card making operation, effectively ensuring the continuity and reliability of wireless card making service.

[0035] Furthermore, during the process of sending card production operation instructions from the tablet terminal to the card production terminal via network communication in step S3, the tablet terminal assigns a globally unique instruction identifier to each card production operation instruction when sending it. A globally unique instruction identifier is a string or numeric code that is not repeated throughout the system. The tablet can generate this identifier using a universally unique identification code standard, or it can combine the tablet's device serial number, current timestamp, and incrementing serial number to form the identifier. Each card-making operation instruction corresponds to a unique identifier, which is encapsulated along with the instruction and sent to the card-making terminal. The card-making terminal maintains a historical list of executed instruction identifiers. This historical list is stored in the local memory of the card-making terminal and is used to record the identifiers of all card-making operation instructions that have been executed by the card-making terminal. The initial state of the historical list is empty. After receiving a card production operation instruction carrying a globally unique instruction identifier from the tablet, the card production terminal does not execute the instruction immediately, but first queries the historical list based on the instruction identifier. The query operation refers to comparing each item in the history list with existing records to determine whether the currently received instruction identifier already exists in the history list; If the identifier already exists in the history list, it means that the card production operation instruction has been received and executed once before by the card production terminal; At this point, the card-making terminal retrieves the result of the last execution of the instruction from the local cache and sends it back to the tablet terminal; The local cache pre-stores the correspondence between the identifier of each executed instruction and its execution result; The card-making end looks up the corresponding execution result in the cache based on the identifier and returns the result directly to the tablet end without re-executing the card-making operation; This avoids the card-making terminal repeatedly executing the same card-making action when the tablet terminal repeatedly sends the same instruction due to network latency or lost confirmation packets, thus preventing card waste and consumable consumption. If the identifier does not exist in the history list, it means that this card production operation instruction is being received for the first time; At this time, the card-making terminal performs the card-making operation normally, that is, it controls the card-making equipment directly connected to it to complete card printing, data writing and other actions according to the instructions. After execution, the card-making terminal stores the identifier of the instruction in the history list, stores the execution result in the local cache, and sends the result back to the tablet terminal. The history list uses a first-in-first-out (FIFO) strategy to limit its storage length. The FIFO strategy means that when the number of identifiers recorded in the history list reaches the preset storage length limit, newly added identifiers will be added to the end of the list, while the earliest identifier at the front of the list will be removed from the list. The maximum storage length can be set according to the local storage capacity of the card-making terminal and actual business needs, for example, it can be set to one thousand. This strategy ensures that the history list does not grow indefinitely, avoiding the problems of excessive storage space consumption and reduced query efficiency due to too many identifiers, while retaining a batch of recently executed instruction identifiers for deduplication. Specifically, through the above mechanism, the present invention ensures that in the event of packet loss or retransmission in wireless network communication, the card production operation instructions repeatedly issued by the tablet terminal will not cause the card production terminal to repeatedly execute the actual card production action, effectively avoiding the waste of card materials and consumables caused by repeated printing or writing, and improving the fault tolerance and resource utilization efficiency of the wireless card production system.

[0036] Furthermore, in this invention, the card-making equipment directly connected to the card-making end via a wired connection also includes at least one of a magnetic stripe reader / writer, a contact smart card reader / writer, and a contactless smart card reader / writer. The Android system built into the card-making terminal establishes a physical connection with the aforementioned devices through a fixed wiring harness. The magnetic stripe reader is used to read and write the magnetic track data stored in the magnetic stripe on the back of bank cards and social security cards, including information from the first, second, and third magnetic tracks. Contact smart card readers connect to the card manufacturing end through an interface conforming to the ISO 7816 standard, and are used to read and write data in the contact smart card chip, such as personal identification information, keys and certificates of social security cards; The contactless smart card reader connects to the card manufacturing end through an RF interface conforming to ISO 14443 or ISO 15693 standards, and is used to exchange data with RFID cards or near-field communication devices to complete the read and write operations of contactless smart cards. Based on the type of card-making operation instruction issued by the tablet terminal, the card-making terminal controls the card-making equipment that is directly connected to the card-making terminal via a wire to complete the operation of writing personalized data into the chip of a legally authorized social security card or bank card. For example, when the card production operation command requires writing information to the magnetic stripe of the social security card, the card production terminal controls the magnetic stripe reader to complete the writing; When the card manufacturing operation command requires updating the key in the chip, the card manufacturing terminal controls the contact smart card reader to complete the writing; When the card-making operation command requires reading the balance of the contactless bus card, the card-making terminal controls the contactless smart card reader to complete the reading; Specifically, by directly connecting magnetic stripe readers, contact smart card readers, and contactless smart card readers to the card-making terminal via wired connections, this invention enables the card-making terminal to simultaneously support multiple types of card reading and writing needs. It eliminates the need for separate wiring harnesses and power supplies for each reader, and also eliminates the need for repeatedly plugging and unplugging different readers on the tablet. All readers receive stable power and data transmission through a fixed wiring harness on the card-making terminal, reducing the number of physical interface plugging and unplugging operations and improving system integration and reliability. Furthermore, the tablet does not need to be directly connected to any reader; it can complete various types of card data reading and writing operations simply by sending commands to the card-making terminal via a wireless network, simplifying the hardware configuration of the mobile terminal.

[0037] Furthermore, in this invention, when at least two tablets establish network communication connections with the same card-making terminal, the card-making terminal maintains a dynamic task queue. Multiple tablets can simultaneously maintain connections with the same card-making terminal via a wireless network. Each tablet can independently issue card-making operation instructions. The card-making terminal establishes a dynamic task queue for these concurrently arriving instructions. This queue changes in real time during operation based on the arrival, execution, and completion of tasks. Each entry in the dynamic task queue must include at least a unique identifier for the tablet, the request time, the business type, and the priority level. The unique identifier on the tablet is used to distinguish the instructions sent by different tablets. It can be the tablet's media access control address, device serial number, or network protocol address. The request time record shows the moment when the card-making terminal receives the instruction, accurate to the millisecond or microsecond level. The service type indicates the specific card issuance service corresponding to this instruction, such as new card issuance, card replacement, social security card activation, password modification, and card loss reporting. Priority levels are pre-set processing priority levels based on business type or tablet user identity. Priority levels can be divided into high priority, medium priority, and low priority. For example, card replacement operations can be set to high priority, while social security card inquiry operations can be set to low priority. The card-making end determines the execution order of tasks in the queue based on priority level and the pre-execution time of the card-making operation instruction; The estimated execution time refers to the estimated time required for the card-making end to complete the instruction based on the business type and operation parameters in the instruction. For example, printing a color card may take six seconds, while reading only ID card information may take one second. The card-making end first sorts the tasks in the queue from highest to lowest priority, with the higher priority tasks placed at the front of the queue; When multiple tasks have the same priority level, the card-making end further compares the pre-execution time of each task, and the task with the shorter execution time is executed in priority over the task with the longer execution time. This scheduling strategy can prevent a long task from occupying the card-making equipment for an extended period, thus blocking all subsequent short tasks and reducing the overall average response time.

[0038] When the card-making terminal processes an instruction, it sends a queuing status notification to other tablet terminals that are making requests. When the card-making terminal retrieves the task to be executed from the dynamic task queue and starts processing the instruction, the card-making terminal proactively sends queuing status notification information to all other tablet terminals that have established connections and have pending requests, except for the tablet terminal that initiated the instruction. The queue status information includes queue length and estimated waiting time; Queue length refers to the number of tasks in the current dynamic task queue that have not yet been executed, including all tasks queued after the task being processed; The estimated waiting time is a time value calculated by the card-making end based on the remaining execution time of the currently executing task and the estimated execution time of each task ahead in the queue. The card-making terminal can periodically update this information and push it to various tablet terminals; After receiving the queuing status notification, the tablet displays the current queuing status and the estimated waiting time on its screen. Based on this, the operator can decide whether to continue waiting, cancel the task, or select another card-making terminal. Specifically, through the aforementioned dynamic task queue and its scheduling mechanism, this invention achieves orderly management when multiple tablets concurrently use the same card-making terminal, avoiding conflicts and chaos between multi-source instructions. The short task priority strategy significantly improves the overall response efficiency of the system, while the queuing status notification information enables operators of each tablet to understand the workload of the card-making terminal in real time, improving the user experience in multi-person collaborative card-making scenarios.

[0039] Furthermore, in this invention, the card-making terminal obtains the status information of its directly connected card-making equipment during idle periods. Idle periods refer to times when the card-making terminal has no card-making operation instructions currently being executed and there are no pending tasks in the dynamic task queue. During this time gap when there is no business processing, the card-making terminal actively communicates with each card-making device directly connected to it through a fixed wiring harness and sends status query commands to devices such as card printers, ID card readers, magnetic stripe readers, contact or contactless smart card readers. Status information includes at least one of ribbon remaining, printhead temperature, and paper jam status; The remaining ribbon quantity refers to the remaining usable length or the remaining number of printable cards of the color or monochrome ribbon installed in the card printer. The card-making end obtains this information by reading the smart chip on the ribbon cartridge or by the ribbon usage count fed back by the printer. Printhead temperature refers to the current operating temperature of the printhead in a card printer. The card-making end obtains this value through the temperature sensor built into the printer. Paper jam status refers to whether there is a card jam inside the card printer. The card making end obtains this status through the paper jam detection sensor of the printer, and its value includes two states: normal and paper jam. After obtaining the above status information, the card-making terminal temporarily stores it in local memory; The card-making terminal can continuously acquire status information from multiple card-making devices within an idle period, or it can acquire information in batches over time. The card-making terminal pushes status information to the tablet terminal for display via network communication connection; After obtaining the status information, the card-making terminal immediately or within the next heartbeat cycle sends the encapsulated status information data packet to each tablet terminal that is connected to it via network communication connection; After receiving the status information, the tablet displays the percentage or number of sheets of ribbon remaining, the current temperature of the printhead, and a message indicating whether there is a paper jam on its screen in graphical or textual form. Operators can promptly understand the operating status of the card making equipment based on the displayed content, prepare to replace consumables in advance before the ribbon runs out, stop using the equipment to prevent damage when the print head temperature is abnormal, and go to the card making end to troubleshoot the problem when a paper jam occurs. Specifically, by actively acquiring and pushing card-making equipment status information during idle periods, this invention eliminates the need for operators to physically inspect the equipment at the card-making terminal or perform any manual queries on the tablet. This allows for remote, real-time monitoring of the card-making equipment's health status, effectively reducing equipment inspection costs, minimizing card-making interruptions due to consumable depletion or equipment malfunctions, and improving the maintainability and user experience of the wireless card-making system.

[0040] Further, please refer to Figure 2 This embodiment also provides a wireless connection system for multi-terminal interoperability of card making machine, the system including a tablet terminal and a card making terminal; The tablet has a built-in ID card module, which is integrated with the tablet and installed directly inside the tablet's casing. It is connected to the motherboard through the tablet's built-in bus. The tablet communicates with the card-making terminal via a wireless network. The tablet is equipped with a wireless communication module that supports wireless LAN communication protocols and can establish a wireless network connection with the card-making terminal. After startup, the tablet receives broadcasts from all available networks and searches for the card-making terminal by listening to the broadcast information on the network. When the tablet receives the identity broadcast from the card-making terminal, it initiates a network communication request to the card-making terminal and establishes a network communication connection with the card-making terminal. After the connection is established, the tablet sends card production operation instructions to the card production terminal through the network communication connection, and receives the operation results returned by the card production terminal, and displays the operation results on its screen to the operator.

[0041] The card-making terminal has a built-in Android system, which runs on the embedded motherboard of the card-making terminal and is responsible for managing all hardware resources and communication logic of the card-making terminal. The card-making end is directly connected to card-making equipment, including at least a card printer, via a fixed cable harness. One end of the fixed cable harness is permanently connected to the interface of the card-making end, and the other end is connected to the card printer, ID card reader, and other card-making equipment respectively. Once connected, the cable is not plugged in or unplugged. The card-making terminal and the card-making equipment use the same power harness for power supply. That is, the card-making terminal and the card printer and other equipment are connected to the same power strip or the same power adapter and are centrally powered by the same AC power supply. The card-making terminal itself is fixed in place, for example, it is placed under the service counter or in a dedicated cabinet and is not mobile. The card-generating terminal is used to continuously broadcast identity information across all connectable networks to locate the tablet terminal; The Android system in the card-making terminal controls the wireless network module to periodically send out broadcast packets containing its own identifier and available service types. These broadcast packets can be received by all devices within the same network. The card-making terminal is also used to respond to network communication requests from the tablet terminal, establish a network communication connection with it, and exit the broadcast loop; When the tablet initiates a connection request, the card-making terminal accepts the request, establishes a two-way communication link with the tablet, and immediately stops broadcasting to avoid unnecessary network occupation. The card-making terminal is also used to receive card-making operation instructions sent from the tablet terminal and control the card-making equipment to perform the corresponding card-making operation; After parsing the instruction content, the card-making terminal sends a print command to the card printer, a read command to the ID card reader, or a corresponding control signal to other card-making equipment through a fixed wiring harness; The card-making terminal is also used to transmit the operation results of the card-making operation back to the tablet terminal, and maintain the network communication connection with the tablet terminal after transmission to wait for new instructions; After the card-making terminal completes a card-making operation, it does not disconnect and continues to maintain the network session with the tablet terminal so that the tablet terminal can immediately send the next instruction without rebroadcasting discovery. Specifically, the wireless connection system for multi-terminal interconnection of card making machines provided by this invention, through the built-in ID card module on the tablet terminal and communication with the card making terminal via a wireless network, and the fixed placement of the card making terminal, which is directly connected to the card making equipment using a fixed cable harness and shares the same power cable harness with the card making equipment, completely solves the problems of insufficient power supply, interface conflict, physical interface loss and limited mobility caused by USB cable harness plugging and unplugging in traditional card making systems. This allows operators to move freely in the service hall with the tablet terminal to complete identity verification and card making operations, while the card making terminal and the various card making devices connected to it stably and reliably perform the actual card making tasks in a fixed position, truly realizing efficient, stable and secure wireless interconnection between multiple terminals.

[0042] Although alternative embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make further changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0043] The above specific embodiments further illustrate the purpose, technical solution and beneficial effects of this application. It should be understood that the above are only specific embodiments of this application and are not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solution of this application should be included within the scope of protection of this invention.

Claims

1. A wireless connection method for multi-terminal interoperability of a card-making machine, applied to a system including a tablet terminal and a card-making terminal, characterized in that, The tablet has a built-in ID card module and communicates with the card-making terminal via a wireless network; The card-making terminal has a built-in Android system and is directly connected to the card-making equipment via a fixed wiring harness. The card-making terminal and the card-making equipment are powered by the same power wiring harness and are fixedly placed. The method includes the following steps: S1, the card-making terminal broadcasts identity information in all connectable networks in a loop to search for the tablet terminal. After the tablet terminal is started, it receives broadcasts from all receiveable networks to search for the card-making terminal. S2, in response to the tablet receiving the broadcast, the tablet and the card-making terminal establish a network communication connection, and the card-making terminal exits the broadcast loop after receiving the network communication request; S3, the tablet terminal sends a card-making operation command to the card-making terminal through the network communication connection; S4, the card-making terminal receives the card-making operation instruction and controls the card-making equipment directly connected to the card-making terminal to perform the corresponding card-making operation; S5, the card-making terminal sends the operation result of the card-making operation back to the tablet terminal; S6, the tablet receives the operation result and feeds it back to the operator, the card-making terminal maintains a network communication connection with the tablet and waits to receive new card-making operation instructions.

2. The method according to claim 1, characterized in that, The built-in ID card module on the tablet is used to verify identity before performing step S3.

3. The method according to claim 1, characterized in that, The card-making terminal is directly connected to the card-making equipment via a fixed wiring harness, including at least a card printer and an ID card reader. The fixed placement of the card-making terminal reduces the number of times the physical interface is plugged and unplugged.

4. The method according to claim 1, characterized in that, After establishing the network communication connection in step S2, the method further includes a step of obtaining the battery status: The card-making terminal obtains the remaining battery power information of the tablet terminal, and compares the remaining battery power with at least one preset power threshold. When the remaining battery power is lower than the first threshold, the terminal performs load offloading processing on the received card-making operation command. The load offloading process includes the card-making terminal receiving metadata of at least one card-making operation task cached by the tablet terminal at one time, storing it in the local task queue of the card-making terminal, and instructing the tablet terminal to enter a low-power mode. During the low-power mode of the tablet terminal, the card-making terminal continues to execute the card-making operations in the task queue. After the execution is completed, the tablet terminal is woken up and the results are sent back.

5. The method according to claim 1, characterized in that, After establishing the network communication connection in step S2, the process also includes connection keep-alive and breakpoint resume steps: The card-making terminal negotiates the initial heartbeat interval with the tablet terminal and monitors network status parameters in real time, including packet loss rate and / or round-trip time jitter value. The card-making terminal dynamically adjusts the heartbeat interval according to the network status parameters. When the packet loss rate is lower than the first packet loss rate threshold and the round-trip time jitter value is lower than the first jitter threshold, the heartbeat interval is increased. When the packet loss rate is higher than the second packet loss rate threshold or the round-trip time jitter is higher than the second jitter threshold, reduce the heartbeat interval; When the heartbeat timeout occurs for a preset number of consecutive times, the connection is determined to be broken. The card-making terminal pauses the current card-making operation and saves the breakpoint information. At the same time, it re-executes step S1 to enter the broadcast search state. The tablet terminal automatically re-executes the broadcast reception and reconnection steps. After reconnection, the card-making terminal continues to execute the card-making operation from the point of breakpoint based on the breakpoint information.

6. The method according to claim 1, characterized in that, In step S3, the tablet assigns a globally unique instruction identifier to each instruction when issuing the card production operation instruction; The card-making terminal maintains a historical list of executed instruction identifiers, and queries the historical list based on the instruction identifier after receiving an instruction: If the identifier already exists, the card-making terminal retrieves the result of the last execution of the instruction from the local cache and sends it back to the tablet terminal; If the identifier does not exist, a card-making operation is performed, the identifier is stored in the history list, and the execution result is stored. The historical list uses a first-in-first-out (FIFO) strategy to limit its storage length.

7. The method according to claim 1, characterized in that, The card-making equipment directly connected to the card-making terminal via a wired connection also includes at least one of the following: a magnetic stripe reader / writer, a contact smart card reader / writer, and a contactless smart card reader / writer.

8. The method according to claim 1, characterized in that, When at least two tablets establish network communication connections with the same card-making terminal, the card-making terminal maintains a dynamic task queue. Each entry in the dynamic task queue includes at least a unique identifier of the tablet, request time, service type, and priority level. The card-making terminal determines the execution order of tasks in the queue based on the priority level and the pre-execution time of the card-making operation instruction, wherein tasks with shorter execution times are executed in priority over tasks with longer execution times; When the card-making terminal processes an instruction, it sends queuing status information to other requesting tablet terminals. The queuing status information includes the queue length and the estimated waiting time.

9. The method according to claim 1, characterized in that, The card-making terminal acquires the status information of its directly connected card-making device during idle periods. The status information includes at least one of ribbon remaining amount, printhead temperature, and paper jam status. The card-making terminal pushes the status information to the tablet terminal for display via the network communication connection.

10. A wireless connection system for multi-terminal interoperability of a card issuing machine, characterized in that, include: On the tablet, which has a built-in ID card module, it communicates with the card-making terminal via a wireless network. After starting up, it receives broadcasts from all available networks to find the card-making terminal, establishes a network communication connection with the card-making terminal, issues card-making operation instructions, and receives and feeds back the operation results. The card-making terminal, with a built-in Android system, is directly connected to a card-making device, including at least a card printer, via a fixed wiring harness. The card-making terminal and the card-making device share the same power supply harness and are fixedly placed. The card-making terminal is used to cyclically broadcast identity information in all connectable networks to search for the tablet terminal, respond to the network communication request from the tablet terminal to establish a network communication connection with it and exit the broadcast loop, receive card-making operation instructions issued by the tablet terminal, control the card-making device to perform the corresponding card-making operation, send the operation result back to the tablet terminal, and maintain a network communication connection with the tablet terminal after the return, waiting to receive new instructions.

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