A conference room reservation information synchronization communication system based on heterogeneous terminals
By combining serial port and low-power wireless communication, the problems of network dependence, terminal adaptation difficulty, reliability and scalability of the meeting room reservation system in complex building scenarios are solved, and efficient and stable information synchronization and display are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-09
- Publication Date
- 2026-07-03
AI Technical Summary
Existing meeting room reservation systems suffer from strong network dependence, difficulty in adapting to heterogeneous terminals, insufficient reliability of centralized architecture, unstable communication, and poor scalability in scenarios such as old buildings and renovated buildings. They cannot meet the requirements of high stability, high reliability, easy deployment, and easy expansion in complex building scenarios.
By combining serial communication with low-power wireless communication, and through standardized information frame encapsulation, a unified parsing strategy for heterogeneous terminals, a dual-link automatic switching mechanism, and a clock offset correction method, reliable distribution and synchronization of meeting room reservation information among heterogeneous terminals can be achieved.
Achieving efficient and reliable information transmission and synchronization in the absence of a unified network environment reduces development and maintenance costs, improves system adaptability and management efficiency, and ensures consistent display and risk resistance across the entire domain.
Smart Images
Figure CN122334555A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of building information communication and conference management technology, and more specifically, to a conference room reservation information synchronous communication system based on heterogeneous terminals. Background Technology
[0002] With the rapid popularization of smart buildings, digital offices, and distributed collaborative offices, meeting rooms, as frequently used public resources in enterprises and parks, have seen their reservation, scheduling, and status display become core aspects of intelligent building management. Currently, mainstream meeting room reservation systems generally adopt a centralized architecture of cloud server + local area network + display terminal, completing data interaction, information synchronization, and status distribution through a unified network. In newly built buildings with good network conditions and standardized cabling, basic meeting management functions can be achieved.
[0003] However, in actual engineering deployment and long-term operation, existing meeting room reservation systems have revealed obvious shortcomings in scenario adaptation and technical limitations. First, they are overly dependent on the network. The system's operation relies heavily on a stable local area network or external network connection. In scenarios such as old buildings, renovated buildings, insufficient low-voltage well resources, severe wireless signal obstruction, and inconvenient large-scale cabling, network latency, disconnection, and packet loss are prone to occur. This directly leads to failures such as the inability to send reservation information, incorrect terminal display, and asynchronous status, seriously affecting meeting order and office efficiency.
[0004] Secondly, the heterogeneity of terminals makes adaptation difficult. Devices such as conference room door screens, front desk screens, office PCs, mobile tablets, and embedded controllers in buildings run different operating systems such as Windows, Android, Linux, and RTOS. Their data protocols, communication interfaces, and parsing rules are incompatible with each other. Traditional systems find it difficult to achieve cross-platform unified parsing and real-time synchronization, and often need to develop separate adaptation programs for different terminals, which greatly increases development and maintenance costs.
[0005] Secondly, centralized architectures lack reliability. Existing systems mostly use servers or hosts as core nodes. Once a host crashes, the network is interrupted, or the service malfunctions, the entire reservation distribution chain will immediately fail. Slave terminals cannot independently obtain and update reservation status, exhibiting the vulnerability of "single point of failure, global paralysis." At the same time, traditional communication methods mainly rely on TCP / IP networks, which have poor transmission stability in long-distance, multi-node, and strong interference environments. Data is easily hijacked, tampered with, or lost, and there is a lack of simple, stable, and low-power communication solutions suitable for building sites.
[0006] Furthermore, most systems lack standardized data frame structures, resulting in chaotic information exchange formats, cumbersome terminal access processes, and the need for reconfiguration and debugging when expanding to new conference rooms or terminals. They also fail to support plug-and-play functionality, making it difficult to meet the practical needs of large and medium-sized campuses for flexible expansion and rapid deployment. Existing technologies also generally lack relay forwarding and dual-link redundancy mechanisms, leading to particularly prominent issues of insufficient signal coverage and unstable communication in complex electromagnetic environments and long-distance transmission scenarios.
[0007] In summary, existing meeting room reservation information distribution and synchronization technologies have significant shortcomings in areas such as weak / no-network environment adaptation, heterogeneous terminal compatibility, distributed reliability, ease of on-site deployment, and system scalability. They cannot fully meet the high stability, high reliability, easy deployment, and easy expansion requirements of meeting management in complex building scenarios. Therefore, developing a meeting room reservation communication system that does not rely on a unified network, supports unified synchronization of heterogeneous terminals, and possesses relay forwarding and dual-link redundancy capabilities has become an urgent technical problem to be solved in the field of smart buildings. Summary of the Invention
[0008] To address the technical problems existing in the prior art, this invention provides a conference room reservation information synchronization communication system based on heterogeneous terminals. By combining serial communication with low-power wireless communication, it enables reliable distribution and synchronous display of conference room reservation information among terminals with different operating systems.
[0009] To achieve the above objectives, the present invention adopts the following technical solution: The present invention provides a conference room reservation information synchronization communication system based on heterogeneous terminals, including a host terminal 100, a communication relay unit 200 and a plurality of slave terminals 300; the host terminal 100 and the communication relay unit 200 are connected through a first serial port, the communication relay unit 200 and the plurality of slave terminals 300 are connected through wireless communication, and the slave terminals 300 and the communication relay unit 200 are also connected through a second serial port.
[0010] The host terminal 100 is used to generate meeting room reservation information, and after encapsulating the meeting room reservation information into a reservation information frame of a preset format, it sends it to the communication relay unit 200 through the first serial port.
[0011] The communication relay unit 200 is used to receive reservation information frames from the host terminal 100, perform structure recognition and information filtering on the reservation information frames, and send the filtered reservation information to each slave terminal 300 via wireless communication.
[0012] The slave terminal 300 is used to receive reservation information sent by the communication relay unit 200 and display the meeting room reservation status based on the received reservation information.
[0013] In a further embodiment of the present invention, the host terminal 100 includes a reservation information generation unit 101, an information encapsulation unit 102, and a serial port transmission unit 103; the reservation information generation unit 101 is used to generate meeting room reservation data, the information encapsulation unit 102 is used to encapsulate the meeting room reservation data according to a preset data structure, and the serial port transmission unit 103 is used to send the encapsulated reservation information frame to the communication relay unit 200 through a first serial port.
[0014] In a further embodiment of the present invention, the communication relay unit 200 includes a serial port receiving unit 201, an information parsing and filtering unit 202, and a wireless transmitting unit 203; the serial port receiving unit 201 is used to receive reservation information frames, the information parsing and filtering unit 202 is used to identify and filter the reservation information frames according to a preset frame structure, and the wireless transmitting unit 203 is used to send the filtered reservation information to several slave terminals 300.
[0015] In a further embodiment of the present invention, the reservation information frame includes a frame start identifier, multiple reservation information fields, and a frame end identifier, with each reservation information field distinguished by a uniform delimiter.
[0016] In a further embodiment of the present invention, the slave unit 300 includes an information receiving unit 301, an information parsing unit 302, and a display unit 303; the information receiving unit 301 is used to receive reservation information, the information parsing unit 302 is used to parse the reservation information, and the display unit 303 is used to display the parsed meeting room reservation status.
[0017] Building upon this foundation, the present invention further enhances the system's operational stability, cross-terminal compatibility, and status synchronization accuracy in scenarios such as complex buildings, weak network obstruction, electromagnetic interference, and heterogeneous terminals through four core technical means: standardized information frame encapsulation, unified parsing strategy for heterogeneous terminals, dual-link automatic switching mechanism, and clock offset correction method. This ensures that meeting room reservation information can still be efficiently distributed, reliably transmitted, accurately parsed, and consistently displayed across the entire network even in environments without a unified network, weak network, or external network.
[0018] Preferably, the present invention encapsulates information frames in a standardized manner; the present invention adopts a fixed-length, uniform-format reservation information frame structure to ensure that all terminals can parse it without difference.
[0019] The frame structure satisfies the following constraint formula: Frame=Head+ID+Acc+Loc+Date+Tstart+Tend+Num+Name+CRC+Tail Among them: Head and Tail are the frame start and end identifiers, used for frame synchronization; CRC is the cyclic redundancy check code, used for transmission integrity verification; all fields have fixed lengths and uniform delimiters to avoid parsing errors from the source.
[0020] Preferably, this invention employs a unified parsing strategy for heterogeneous terminals; to ensure consistent parsing across heterogeneous terminals such as Windows, Android, Linux, and RTOS, this invention defines a parsing success rate formula: P_ana % In the formula: N_correct: number of correctly parsed frames; N_total: total number of received frames. This system can ensure a high parsing success rate; P_analyze ≥ 99.5%, achieving full platform compatibility.
[0021] Preferably, the present invention uses a dual-link automatic handover mechanism; to ensure uninterrupted communication in weak network, obstructed, or interference environments, the system monitors the wireless signal quality in real time and executes the following link handover decision conditions: If(RSSI<-85dBm)OR(Loss_count≥3)ThenSwitch_to_UART In the formula: RSSI: wireless signal strength; Loss_count: the number of consecutive lost frames. If any condition is met, the system will automatically switch from wireless to the second serial port to achieve seamless redundant communication.
[0022] Preferably, the present invention employs a clock offset correction method; to eliminate display asynchrony caused by slave clock drift, the present invention employs a master reference time correction formula: T_sync = T_local + ΔT ΔT = T_host - T_terminal Where: T_sync: corrected slave synchronization time; T_local: slave local time; ΔT: master and slave time offset; T_host: master standard time. After correction, the synchronization error of the whole system is ≤100ms, ensuring that the status of all terminals is completely consistent.
[0023] Through the aforementioned standardized frame structure, unified parsing rules, dual-link redundancy, and high-precision clock correction, this invention realizes a conference room reservation information distribution system that is available without a network, heterogeneous compatible, stable and reliable, and synchronized across the entire domain, significantly improving system adaptability and management efficiency in complex building scenarios.
[0024] Compared with the prior art, the present invention has the following beneficial effects: This invention overcomes the shortcomings of traditional systems, such as excessive reliance on networks, difficulty in adapting to heterogeneous terminals, low reliability of centralized architecture, and poor information synchronization accuracy, through key technologies such as dual-link communication combining serial port and low-power wireless, standardized information frame encapsulation, relay forwarding decoupling architecture, and clock skew correction. It has outstanding technical advantages and practical value.
[0025] This invention employs a communication method with redundant wireless main link and serial backup link, coupled with signal quality monitoring and automatic switching mechanisms. It can maintain stable communication in complex building environments with no unified local area network, weak network coverage, wireless obstruction, and strong electromagnetic interference. It completely eliminates the dependence on traditional TCP / IP networks and cloud platforms, effectively solving the problems of system deployment failure or operation interruption in old buildings and scenarios where wiring is inconvenient. It significantly improves the continuity of information transmission and environmental adaptability.
[0026] This invention designs reservation information frames with fixed structures, unified fields, and standardized separation, and uses a platform-independent unified parsing strategy to enable terminal devices with different operating systems such as Windows, Android, Linux, and RTOS to complete information recognition and status restoration according to the same rules. This eliminates the need to develop separate adaptation programs for various hardware and systems, truly achieving seamless compatibility and consistent display between heterogeneous terminals, and significantly reducing the cost of system development, deployment, and subsequent maintenance.
[0027] This invention introduces a host reference time and clock offset correction method to correct the local clock deviation of each slave terminal with a unified time reference. This effectively eliminates the clock drift problem caused by crystal oscillator error and long-term operation, enabling high-precision status synchronization of all terminals in the building. It avoids situations such as incorrect appointment time and inconsistent status display, and greatly improves the standardization and accuracy of meeting management.
[0028] Meanwhile, this invention adopts a three-level decoupled architecture of "master-relay-slave," using a communication relay unit to complete data verification, filtering, and forwarding, reducing the direct coupling between the master and slave units. This ensures that a single point of failure does not affect the overall operation, significantly enhancing the system's resilience. Combined with a standardized frame structure and CRC check mechanism, it can effectively filter erroneous frames, duplicate frames, and interference data, ensuring the integrity and accuracy of reservation information during transmission.
[0029] In addition, the system of this invention is easy to deploy and highly scalable, requiring no complex network configuration and cabling construction. New conference rooms and display terminals can be added and used immediately. It can be flexibly adapted to various scenarios such as small and medium-sized office buildings, large industrial parks, and building renovations, and has stronger versatility and practicality, which better meets the construction needs of smart buildings for high efficiency, stability, and low cost. Attached Figure Description
[0030] Figure 1 This invention provides an overall structural block diagram of a conference room reservation information synchronization communication system based on heterogeneous terminals, as provided in an embodiment of the invention. Figure 2 This is a block diagram of the host-side structure in an embodiment of the present invention; Figure 3 This is a block diagram of the communication relay unit structure in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structural composition of the reservation information frame in an embodiment of the present invention; Figure 5 This is a block diagram of the slave device structure in an embodiment of the present invention. Detailed Implementation
[0031] The following is in conjunction with the appendix Figure 1 To be continued Figure 5 The technical solution of the present invention will be further described in detail below with specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiment.
[0032] Example 1 This embodiment provides a conference room reservation information synchronization communication system based on heterogeneous terminals, as shown in the attached figure. Figure 1 As shown, attached Figure 1 A block diagram of an overall structure of a conference room reservation information synchronization communication system based on heterogeneous terminals provided in an embodiment of the present invention is shown below. Figure 1 As shown, the system includes a host terminal 100, a communication relay unit 200, and several slave terminals 300. In this embodiment, the host terminal 100 adopts an embedded processor platform running the Android system, integrating a touch screen and reservation management software for inputting, editing, storing, and generating meeting room reservation information; the host terminal 100 establishes a wired connection with the communication relay unit 200 through a first serial port (an RS485 serial port is selected in this embodiment), ensuring that the data transmission between the host terminal and the relay unit has the characteristics of strong anti-interference ability, long transmission distance, and high stability.
[0033] Combined with appendix Figure 1 and Figure 2 , attached Figure 2This is a block diagram of the host terminal structure in an embodiment of the present invention. The host terminal 100 specifically includes a reservation information generation unit 101, an information encapsulation unit 102, and a serial port transmission unit 103. The reservation information generation unit 101 is used to generate meeting room reservation data. The specific data collection process is as follows: Staff select the target meeting room through the touch screen of the host terminal 100, and enter the reservation person's information (including name, employee number, and contact information), meeting room location information (such as building floor and room number), reservation date, meeting start time, meeting end time, number of participants, and meeting topic name, etc. The system automatically checks for abnormal situations such as time conflicts and the number of participants exceeding the meeting room's rated capacity. After confirming that there are no errors, standardized reservation data is generated. The information encapsulation unit 102 is used to encapsulate the meeting room reservation data into a reservation information frame in a preset format. The encapsulation process strictly follows the design specifications of fixed length and uniform delimiter to ensure that terminals of different operating systems can be parsed without difference. The serial port transmission unit 103 transmits the encapsulated reservation information frame stably to the communication relay unit 200 through the first serial port at a fixed baud rate (9600bps in this embodiment). The frame start identifier and CRC check code are attached during the transmission process to provide a basis for subsequent data verification.
[0034] Please combine Figure 1 and Figure 3 , Figure 3 This is a block diagram of the communication relay unit in an embodiment of the present invention. The communication relay unit 200 includes a serial port receiving unit 201, an information parsing and filtering unit 202, and a wireless transmitting unit 203. The serial port receiving unit 201 listens to and receives reservation information frames from the host 100 in real time through the first serial port, buffers the received data and waits for the complete frame transmission to be completed; the information parsing and filtering unit 202 identifies and filters the reservation information frames according to the preset frame structure. The specific execution steps are as follows: First, the frame start identifier is identified to determine whether the data frame is transmitted completely. If the frame start identifier is not detected, it is determined to be invalid fragment data and is directly discarded; if the frame structure is complete, the transmission integrity is checked by CRC check code, and the error frames that fail the check are removed. At the same time, the repeatedly sent reservation information frames are removed to avoid the situation of repeated status refresh on the slave end; the wireless transmission unit 203 sends the filtered valid reservation information frames to several slave ends 300 in a broadcast form through a low-power wireless communication method (in this embodiment, a LoRa wireless module is used, which supports long-distance, low-power transmission), realizing data relay and decoupling, and reducing the direct coupling between the host end and the slave end.
[0035] Please combine Figure 1 and Figure 4 , Figure 4This is a schematic diagram illustrating the structural composition of a reservation information frame in an embodiment of the present invention. The reservation information frame sequentially includes a frame start identifier, a meeting room identifier field, a reservation account field, a meeting room location field, a reservation date field, a start time field, an end time field, a number of participants field, and a meeting name field, ending with a frame end identifier, thus forming a complete data frame structure. Each reservation information field is distinguished by a uniform separator (a comma "," is used in this embodiment), and each field has a fixed length constraint, specifically satisfying the following constraint formula: Frame=Head+ID+Acc+Loc+Date+Tstart+Tend+Num+Name+CRC+Tail Here, Head is the frame start identifier (set to "#" in this embodiment), and Tail is the frame end identifier (set to "*" in this embodiment). Both are used to achieve frame synchronization identification for heterogeneous terminals. CRC is the Cyclic Redundancy Check code, used to verify data integrity during transmission to ensure that data has not been tampered with or lost. ID is the unique identifier of the meeting room, Acc is the reservation account information, Loc is the location of the meeting room, Date is the reservation date, Tstart / Tend are the meeting start / end times respectively, Num is the number of participants, and Name is the meeting topic name. All fields have fixed lengths and uniform parsing rules to avoid parsing errors and garbled characters caused by inconsistent data formats from the root.
[0036] Please combine Figure 1 and Figure 5 , Figure 5 This is a block diagram of the slave unit structure in this embodiment of the invention. The slave unit 300 is a display terminal deployed outside the doors of each conference room, supporting heterogeneous operating systems such as Windows, Android, Linux, and RTOS. Specifically, it includes an information receiving unit 301, an information parsing unit 302, and a display unit 303. The information receiving unit 301 supports dual-link reception via wireless communication and a second serial port (USART serial port is used in this embodiment). By default, it prioritizes receiving reservation information frames sent by the communication relay unit 200 via the wireless link, while simultaneously monitoring the wireless signal strength (RSSI) and the number of consecutive lost frames (Loss_count) in real time, and executing link switching decision conditions. If(RSSI<-85dBm)OR(Loss_count≥3)ThenSwitch_to_UART When the wireless signal strength is below -85dBm or three or more consecutive frames of data are lost, the system automatically and smoothly switches from wireless communication to the second serial port communication to ensure uninterrupted communication in environments with weak networks, obstructions, or strong electromagnetic interference. The information parsing unit 302 parses the received reservation information frames, specifically executing unified parsing rules: truncating fields to a fixed length, splitting data according to a unified delimiter, extracting frame start / end identifiers to complete frame synchronization, and defining a parsing success rate formula. P_ana % Where N_correct represents the number of correctly parsed frames, and N_total represents the total number of received frames. This embodiment ensures a system parsing success rate P_analyze ≥ 99.5% through standardized frame structure and parsing rules, achieving cross-platform compatibility. During the parsing process, the information parsing unit 302 also performs clock offset correction based on the host reference time, using the host reference time correction formula: T_sync = T_local + ΔT ΔT = T_host - T_terminal Wherein, T_sync is the corrected slave synchronization time, T_local is the slave's local time, ΔT is the time offset between the master and slave, T_host is the master's standard time, and T_terminal is the slave's local time when receiving the frame. Correction eliminates time deviations caused by slave clock drift, ensuring a system-wide synchronization error ≤100ms. Display unit 303 is an LCD module that displays the current reservation status of the meeting room in real-time and accurately based on the parsed reservation information. Specific display content includes the meeting room number, the person making the reservation, the reservation time, the number of attendees, and the meeting topic. It employs a three-level display strategy: real-time refresh, periodic self-check, and offline persistence. The display status is refreshed immediately upon receiving a new reservation information frame; the local clock and reservation status are checked every second to ensure accurate display; and even if the wireless or serial link is disconnected, the last valid reservation status is maintained to avoid black screens or garbled characters, ensuring the continuity of the meeting room status display.
[0037] The system operation flow in this embodiment is as follows: Reservation information generation: Staff enter meeting room reservation data through the reservation information generation unit 101 of the host terminal 100, the information encapsulation unit 102 encapsulates the data into a standardized reservation information frame, and the serial port sending unit 103 sends it to the communication relay unit 200 through the first serial port. Data relay processing: The serial port receiving unit 201 of the communication relay unit 200 receives the reservation information frame, the information parsing and filtering unit 202 completes frame identification, CRC check and invalid frame filtering, and the wireless transmitting unit 203 broadcasts the valid frame to each slave terminal 300 through low power wireless. Information reception and parsing: The information receiving unit 301 of the slave terminal 300 selects wireless or second serial port to receive data according to the signal quality, and the information parsing unit 302 executes unified parsing rules and clock offset correction to extract valid reservation information; Status display: Display unit 303 displays the meeting room reservation status in real time, achieving a high degree of consistency in the status of all terminals in the building.
[0038] The system in this embodiment can operate stably in old buildings, renovated buildings, and environments with weak network coverage without a unified local area network or external network. It does not require large-scale cabling construction, and can be used immediately when adding new conference rooms or slave units. It has the advantages of simple structure, flexible deployment, strong compatibility, high synchronization accuracy, and good stability. It can be widely used for intelligent management of conference rooms in various office buildings, industrial parks, and old buildings, and effectively solves the technical problems of traditional conference room reservation systems such as reliance on networks, difficulty in adapting to heterogeneous terminals, low synchronization accuracy, and poor anti-interference ability.
[0039] Example 2 The core structure and operation process of this embodiment are the same as those of Embodiment 1. The difference is that the communication relay unit 200 in this embodiment is equipped with dual wireless modules (which support LoRa and Bluetooth Low Energy communication respectively), which can automatically switch the communication frequency band according to the deployment location of the slave unit 300, further improving the signal coverage capability inside complex buildings; the display unit 303 of the slave unit 300 is equipped with a status indicator light, which stays on when the meeting room is in the reserved state and flashes when it is idle, so that staff can quickly identify the usage status of the meeting room and improve the scheduling efficiency of the meeting room.
[0040] Example 3 This embodiment shares the same core structure and operating flow as Embodiment 1, with the following differences: In this embodiment, the host unit 100 integrates a Bluetooth module, supporting wireless connection with mobile terminals (phones, tablets). Staff can remotely input reservation information via mobile terminals. The information encapsulation unit 102 encapsulates the reservation data input by the mobile terminal into standardized reservation information frames and sends them to the serial port transmission unit 103, realizing remote input and synchronous distribution of reservation information and improving the ease of use of the system. The information parsing and filtering unit 202 adds a data encryption module to encrypt the reservation information frames using AES. The information parsing unit 302 on the slave unit 300 decrypts the frames before parsing and displaying them, improving the security of reservation information transmission and preventing information leakage.
[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A conference room reservation information synchronization communication system based on heterogeneous terminals, characterized in that, The system includes a host terminal, a communication relay unit, and several slave terminals. The host terminal and the communication relay unit are connected via a first serial port, and the communication relay unit is connected to the slave terminals via wireless communication. The slave terminals and the communication relay unit are also connected via a second serial port to form a dual-link redundant connection. The host terminal generates meeting room reservation information, encapsulates the reservation information into a reservation information frame of a preset format, and sends it to the communication relay unit via the first serial port. The communication relay unit receives the reservation information frames from the host terminal, performs structure recognition, data verification, and information filtering on the reservation information frames, and sends the filtered valid reservation information to each slave terminal via wireless communication. The slave terminals receive the reservation information sent by the communication relay unit and display the meeting room reservation status based on the parsed reservation information.
2. The meeting room reservation information synchronization communication system based on heterogeneous terminals according to claim 1, characterized in that, The host unit includes a reservation information generation unit, an information encapsulation unit, and a serial port transmission unit. The reservation information generation unit is used to collect and generate meeting room reservation data, including meeting room identifier, reservation account, meeting room location, reservation date, start time, end time, number of participants, and meeting name. The information encapsulation unit is used to standardize and encapsulate the reservation data according to a preset fixed structure to form a reservation information frame that can be uniformly parsed across terminals. The serial port transmission unit is used to stably send the encapsulated reservation information frame to the communication relay unit through the first serial port.
3. The meeting room reservation information synchronous communication system based on heterogeneous terminals according to claim 1, characterized in that, The communication relay unit includes a serial port receiving unit, an information parsing and filtering unit, and a wireless transmitting unit; the serial port receiving unit is used to receive reservation information frames from the host through a first serial port. The information parsing and filtering unit is used to complete frame synchronization identification, CRC verification, error frame removal and duplicate frame filtering according to the preset frame structure; the wireless transmission unit is used to send the filtered valid reservation information to each slave terminal in the form of broadcast.
4. The meeting room reservation information synchronous communication system based on heterogeneous terminals according to claim 1, characterized in that, The reservation information frame sequentially includes a frame start identifier, a meeting room identifier field, a reservation account field, a meeting room location field, a reservation date field, a start time field, an end time field, a number of participants field, a meeting name field, a CRC check field, and a frame end identifier. All fields are separated by a uniform delimiter and satisfy the following structural constraints: Frame=Head+ID+Acc+Loc+Date+Tstart+Tend+Num+Name+CRC+Tail Head is the frame start identifier, Tail is the frame end identifier, and CRC is the cyclic redundancy check code.
5. A conference room reservation information synchronization communication system based on heterogeneous terminals according to claim 1, characterized in that, The slave device includes an information receiving unit, an information parsing unit, and a display unit; the information receiving unit supports dual-link reception via wireless and a second serial port, and can monitor the wireless signal strength RSSI and the number of consecutive lost frames (Loss_count) in real time, and execute link switching decision conditions. If(RSSI<-85dBm)OR(Loss_count≥3)ThenSwitch_to_UART The system automatically switches from wireless communication to the second serial port communication when any condition is met. The information parsing unit is used to parse the reservation information frame according to a unified rule and perform clock offset correction based on the host reference time. The correction formula is as follows: T_sync=T_local+ΔTΔT=T_host-T_terminal Where T_sync is the corrected synchronization time, T_local is the slave local time, ΔT is the time offset between the master and slave, and T_host is the master standard time; the display unit is used to display the meeting room reservation status in real time according to the parsing results, and supports offline status maintenance.
6. A conference room reservation information synchronization communication system based on heterogeneous terminals according to claim 5, characterized in that, The information parsing unit achieves compatibility with heterogeneous terminals such as Windows, Android, Linux, and RTOS according to a unified parsing rule, and calculates the parsing success rate using the following formula: P_ana % Where N_correct is the number of correctly parsed frames, N_total is the total number of received frames, and the system parsing success rate is no less than 99.5%.
7. A conference room reservation information synchronization communication system based on heterogeneous terminals according to claim 1, characterized in that, After the slave device completes the clock offset correction, the synchronization error of the terminal status of the entire system does not exceed 100ms.
8. A conference room reservation information synchronization communication system based on heterogeneous terminals according to claim 1, characterized in that, The communication relay unit uses a LoRa low-power wireless module to achieve long-distance, interference-resistant data broadcast transmission.
9. A conference room reservation information synchronous communication system based on heterogeneous terminals according to claim 1, characterized in that, The first serial port is an RS485 serial port, and the second serial port is a USART serial port.
10. A conference room reservation information synchronization communication system based on heterogeneous terminals according to claim 1, characterized in that, The system supports plug-and-play slave terminals and can stably distribute and synchronously display meeting room reservation information in environments without a unified local area network, weak networks, and complex electromagnetic fields.