Radio frequency tag identification method and device, computer device and storage medium

Abstract

The application discloses a radio frequency tag identification method and device, computer equipment and a storage medium. The method comprises the following steps: acquiring state synchronization data sent by a master control unit through a communication link; checking radio frequency tag identification data in the state synchronization data based on check information to obtain a check result; and determining a radio frequency tag identification result based on the radio frequency tag identification data when the check result is a check pass. The slave control unit can complete the determination of the radio frequency tag identification result based on the radio frequency tag identification data on the master control unit side, thereby reducing the necessity of configuring a radio frequency identification module on the slave control unit side. Meanwhile, the slave control unit determines the radio frequency tag identification result only after the check is passed, which can reduce the risk of misjudgment of the radio frequency tag identification state of the slave control unit, thereby balancing the product space, hardware cost and reliability of the radio frequency tag identification result on the slave control unit side.

Description

Technical Field

[0001] This invention relates to the field of industrial safety, and in particular to a radio frequency tag identification method, apparatus, computer equipment, and storage medium. Background Technology

[0002] In the field of industrial safety control, devices such as safety locks, safety switches, and safety relays typically require RFID tag identification to determine whether operators, doors, keys, or objects under inspection meet preset safety control conditions. To improve the reliability of safety control systems, some systems employ a collaborative architecture between a master control unit and a slave control unit. Both units participate in determining the RFID tag identification status and managing the safety status, thus reducing the impact of a single control unit malfunction on the safety control outcome.

[0003] In existing technologies, to enable both the main control unit and the slave control unit to obtain RFID tag identification results, RFID modules are typically configured on both sides. Each control unit then reads and identifies the RFID tag using its corresponding module. While this approach allows both units to obtain RFID tag identification data, it requires two sets of RFID modules, increasing hardware costs and circuit layout space, as well as the complexity of internal wiring and structural layout. Furthermore, the need for synchronization or consistency checks on the identification results from both sides during the separate identification process increases the complexity of the control logic.

[0004] Therefore, how to reduce the redundant configuration of RFID modules in security control systems, while taking into account both product space and the reliability of identification results from the control unit side, has become a technical problem that needs to be solved. Summary of the Invention

[0005] Based on this, it is necessary to provide an RFID tag identification method, device, computer equipment, and storage medium to address the above-mentioned technical problems. This method has the advantages of reducing redundant configuration of RFID modules in security control systems, thereby balancing product space requirements and the reliability of identification results from the control unit side.

[0006] A radio frequency tag identification method is provided, the method being applied to a slave control unit of a security control system, the security control system further comprising a master control unit, the master control unit being configured with a radio frequency identification module, and the master control unit and the slave control unit being connected to the same communication link, the method comprising: The status synchronization data sent by the main control unit is obtained through the communication link. The status synchronization data includes RFID tag identification data and verification information generated by the main control unit based on the RFID tag identification data. The RFID tag identification data is obtained by the main control unit through the RFID module to identify the RFID tag. The RFID tag identification data includes RFID tag identification information and RFID tag identification status. The RFID tag identification information is used to characterize the identity of the RFID tag. The RFID tag identification status includes in-place status and removed status. Based on the verification information, the RFID tag identification data in the status synchronization data is verified to obtain the verification result; When the verification result is successful, the RFID tag identification result is determined based on the RFID tag identification data.

[0007] Optionally, when the verification result is successful, determining the RFID tag identification result based on the RFID tag identification data includes: When the verification result is successful, the RFID tag identification information is matched with the RFID tag identification information stored locally from the control unit to obtain a tag matching result; Based on the tag matching result and the RFID tag identification status, the RFID tag identification result is determined.

[0008] Optionally, matching the RFID tag identification information with the RFID tag identification information stored locally from the control unit to obtain a tag matching result includes: The multiple bytes in the RFID tag identification information are compared byte by byte with the multiple bytes in the RFID tag identification information stored locally from the control unit to obtain the comparison result; When the comparison result shows that a preset number of consecutive bytes match, the tag matching result is determined to be a successful match.

[0009] Optionally, determining the RFID tag identification result based on the tag matching result and the RFID tag identification status includes: When the tag matching result is a successful match and the RFID tag identification status is in place, the in-place status is confirmed for the first time to obtain the first continuous confirmation result. When the tag matching result is a match failure, or the RFID tag identification status is a removal status, a second continuous confirmation is performed on the tag matching result being a match failure and / or the removal status to obtain a second continuous confirmation result; The RFID tag identification result is determined based on the first or the second consecutive confirmation result; The second number is greater than the first number.

[0010] Optionally, the verification information includes a cyclic redundancy check value; after verifying the RFID tag identification data in the status synchronization data based on the verification information and obtaining the verification result, the method further includes: When the verification result is a verification failure, update the number of verification failures; When the number of verification failures reaches a preset failure threshold, it is determined that there is a communication failure between the main control unit and the slave control unit.

[0011] Optionally, before obtaining the status synchronization data sent by the main control unit through the communication link, the method further includes: The initialization synchronization data packet sent by the main control unit is obtained through the communication link. The initialization synchronization data packet includes device type, output type, RFID tag identification information, version number, and initialization verification information. Based on the initialization verification information, the initialization synchronization data packet is verified; If the initialization synchronization data packet passes verification, the RFID tag identification information in the initialization synchronization data packet is stored.

[0012] Optionally, when the verification result is successful, after determining the RFID tag identification result based on the RFID tag identification data, the method further includes: The RFID tag identification status of the slave control unit is updated based on the RFID tag identification result; The identification status of the RFID tag is associated with the safety output fault status, power failure status, and communication fault status of the security control system.

[0013] An RFID tag identification device is applied to a slave control unit of a security control system. The security control system further includes a master control unit, which is equipped with an RFID module. The master control unit and the slave control unit are connected to the same communication link. The device includes: The acquisition module is used to acquire status synchronization data sent by the main control unit through the communication link. The status synchronization data includes RFID tag identification data and verification information generated by the main control unit based on the RFID tag identification data. The RFID tag identification data is obtained by the main control unit through the RFID module to identify the RFID tag. The RFID tag identification data includes RFID tag identification information and RFID tag identification status. The RFID tag identification information is used to characterize the identity of the RFID tag, and the RFID tag identification status includes in-place status and removed status. The verification module is used to verify the radio frequency tag identification data in the status synchronization data based on the verification information, and obtain the verification result; The determination module is used to determine the RFID tag identification result based on the RFID tag identification data when the verification result is that the verification is passed.

[0014] A computer device includes a memory, a processor, and computer-readable instructions stored in the memory and executable on the processor, wherein the processor implements the above-described radio frequency tag identification method when executing the computer-readable instructions.

[0015] A readable storage medium having computer-readable instructions stored thereon, which, when executed by a processor, implement the above-described radio frequency tag identification method.

[0016] The aforementioned RFID tag identification method, apparatus, computer equipment, and storage medium acquire status synchronization data sent by the main control unit through the communication link. This status synchronization data includes RFID tag identification data and verification information generated by the main control unit based on the RFID tag identification data. The RFID tag identification data is obtained by the main control unit through the RFID module identifying the RFID tag. The RFID tag identification data includes RFID tag identification information and RFID tag identification status. The RFID tag identification information characterizes the identity of the RFID tag, and the RFID tag identification status includes an in-place status and a removed status. Based on the verification information, the RFID tag identification data in the status synchronization data is verified to obtain a verification result. When the verification result is successful, the RFID tag identification result is determined based on the RFID tag identification data. In summary, the control unit acquires status synchronization data sent by the main control unit through the same communication link. The status synchronization data includes RFID tag identification data identified by the RFID module on the main control unit side and corresponding verification information. After receiving the status synchronization data, the control unit first verifies the RFID tag identification data based on the verification information, and determines the RFID tag identification result based on the RFID tag identification data when the verification is successful. Therefore, the slave control unit can determine the RFID identification result based on the RFID identification data from the master control unit, thereby reducing the need for repeated configuration of the RFID module on the slave control unit side. This helps to reduce hardware costs, reduce circuit layout space, and simplify the master-slave identification result synchronization logic. At the same time, the slave control unit does not directly and unconditionally use the data sent by the master control unit, but determines the RFID identification result only after verification. This reduces the risk of communication interference or abnormal data transmission causing the slave control unit to misjudge the RFID identification status, thus balancing product space, hardware costs, and the reliability of the RFID identification result on the slave control unit side. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic flowchart of an RFID tag identification method according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a radio frequency tag identification device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a computer device according to an embodiment of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In one embodiment, such as Figure 1 As shown, a radio frequency tag identification method is provided. This method is applied to a slave control unit of a security control system. The security control system also includes a master control unit, which is equipped with a radio frequency identification module. The master control unit and the slave control unit are connected to the same communication link. The method includes the following steps: 101. Obtain status synchronization data sent by the main control unit through the communication link.

[0021] In this embodiment of the invention, the safety control system can be an industrial safety door lock, safety switch, safety relay, safety light curtain controller, or other industrial safety equipment requiring safety status monitoring. The safety control system includes a main control unit and a slave control unit. The main control unit can be a main control chip, a main control microcontroller, or a main safety controller, while the slave control unit can be a slave control chip, a slave control microcontroller, or an auxiliary safety controller. The main control unit is equipped with a radio frequency identification (RFID) module, which may include an RFID read / write chip, an RFID antenna, and peripheral matching circuitry connected to the RFID read / write chip, used for sensing, reading, and identifying RFID tags. The communication link can be a serial communication link, an SPI communication link, a CAN communication link, an I2C communication link, or other communication links capable of transmitting data between the main control unit and the slave control unit.

[0022] In the actual operation, the main control unit identifies RFID tags through the RFID module, obtaining RFID tag identification data. RFID tag identification data can be understood as data characterizing the RFID tag identification status, specifically including RFID tag identification information and RFID tag identification status. RFID tag identification information identifies the RFID tag, such as its unique serial number, card number, tag serial number, or encoded tag identification data. RFID tag identification status characterizes the current identification status of the RFID tag, such as in-situ, removed, successfully identified, or failed to identify. After obtaining the RFID tag identification data, the main control unit can filter, de-jitter, or format the data to reduce the impact of radio frequency interference, momentary departure from the identification area, and other factors on identification stability.

[0023] The main control unit can also generate verification information based on the RFID tag identification data, and encapsulate the RFID tag identification data and verification information into status synchronization data before sending it to the slave control unit via the communication link. The verification information can be a cyclic redundancy check (CRC) value, a cumulative check value, a parity check value, or other check values ​​that can be used to determine the integrity of data transmission. For example, the main control unit can calculate a CRC16 check value for the byte content in the RFID tag identification data and combine the CRC16 check value with the RFID tag identification data to form the status synchronization data. In this way, after receiving the status synchronization data, the slave control unit does not directly use the identification content sent by the main control unit, but can first use the verification information to determine whether errors occurred during the transmission of the RFID tag identification data, thus providing a reliable data foundation for subsequently determining the RFID tag identification result.

[0024] In one possible embodiment, the status synchronization data may further include a frame header, data length, data type, frame sequence number, or time stamp. The frame header can help the control unit identify the start position of a frame of status synchronization data; the data length can determine the length of the data to be received; the data type can distinguish between RFID tag identification data, fault status data, or initialization data; and the frame sequence number or time stamp can help determine whether the data is lost, duplicated, or expired. This data organization method improves the stability and traceability of RFID tag identification data synchronization between the master and slave control units.

[0025] 102. Based on the verification information, verify the RFID tag identification data in the status synchronization data to obtain the verification result.

[0026] In this embodiment of the invention, after acquiring the status synchronization data, the slave control unit can first parse the RFID tag identification data and verification information from the status synchronization data. Then, according to the verification rules consistent with those of the master control unit, it recalculates the verification value of the RFID tag identification data and compares the recalculated verification value with the verification information carried in the status synchronization data to obtain the verification result. If the recalculated verification value matches the verification information, it indicates that the RFID tag identification data did not experience data misalignment, loss, or tampering during the transmission process from the master control unit to the slave control unit, and the verification result can be determined as successful. If the recalculated verification value does not match the verification information, it indicates that the RFID tag identification data may have been interfered with or experienced an anomaly during transmission, and the verification result can be determined as failed.

[0027] For example, when the verification information is a CRC16 checksum, the main control unit can calculate the CRC16 checksum based on each byte of the RFID tag identification data and send the CRC16 checksum along with the RFID tag identification data to the slave control unit. After receiving the status synchronization data, the slave control unit uses the same CRC16 algorithm to calculate the CRC16 checksum on the received RFID tag identification data. If the calculation result matches the received CRC16 checksum, the status synchronization data frame is considered valid; otherwise, it is considered invalid. This verification process avoids the slave control unit directly using incorrect RFID tag identification data, thereby reducing the risk of misjudgment of RFID tag identification results due to communication interference.

[0028] In one possible embodiment, the verification scope may include not only the RFID tag identification data itself, but also fields such as data type, data length, frame sequence number, or time stamp. Thus, when performing verification, the slave control unit can not only determine whether the RFID tag identification data is complete, but also whether the status synchronization data has frame type errors, abnormal lengths, duplicate receptions, or timing anomalies, thereby further improving the reliability of data synchronization between the master and slave control units.

[0029] 103. When the verification result is "verification passed", determine the RFID tag identification result based on the RFID tag identification data.

[0030] In this embodiment of the invention, after confirming that the verification result is successful, the control unit can use the RFID tag identification data as valid data and determine the RFID tag identification result based on the RFID tag identification data. The RFID tag identification result can be used to characterize whether the RFID tag has been effectively identified, whether the RFID tag is in place, whether the RFID tag has been removed, whether the RFID tag identifier matches, or whether the RFID tag identification is abnormal. For example, when the RFID tag identification data includes RFID tag identification information and RFID tag identification status, the control unit can determine whether the currently identified RFID tag is a preset tag based on the RFID tag identification information, and determine whether the RFID tag is still within the effective identification range of the RFID module based on the RFID tag identification status.

[0031] Specifically, when the RFID tag identification data indicates that the RFID tag is in place, and the RFID tag identification information matches the RFID tag identification information stored locally by the control unit, the control unit can determine that the RFID tag identification result is valid. When the RFID tag identification data indicates that the RFID tag is removed, or the RFID tag identification information does not match the RFID tag identification information stored locally by the control unit, the control unit can determine that the RFID tag identification result is invalid or abnormal. In this way, the control unit does not simply receive the final judgment result from the main control unit, but performs local judgment based on its own stored data and the received identification status after the communication verification is passed, thereby improving the reliability of the RFID tag identification result on the control unit side.

[0032] When the verification result fails, the slave control unit can choose not to update the RFID tag identification result based on the currently received RFID tag identification data. This avoids incorrect identification results being written into the local status due to communication interference, data misalignment, or data loss. For example, if the status synchronization data sent by the master control unit is interfered with during transmission, causing some bytes in the RFID tag identification information to change, the slave control unit can identify this anomaly through verification, discard the current frame data, and continue waiting for the next frame of valid status synchronization data, thereby avoiding misjudging an erroneous tag as a valid tag.

[0033] In one possible embodiment, after determining the RFID tag identification result, the slave control unit can also write the RFID tag identification result into a local status register, status buffer, or fault status management module, enabling the RFID tag identification result to participate in subsequent security output control, door lock status judgment, fault alarm, or safety shutdown logic. By incorporating the RFID tag identification result into the slave control unit's local security status management, the slave control unit can still obtain a reliable RFID tag identification status even in the absence of direct RFID acquisition actions.

[0034] In this embodiment of the invention, status synchronization data sent by the main control unit is obtained through the communication link. The status synchronization data includes RFID tag identification data and verification information generated by the main control unit based on the RFID tag identification data. The RFID tag identification data is obtained by the main control unit through the RFID module identifying the RFID tag. Based on the verification information, the RFID tag identification data in the status synchronization data is verified to obtain a verification result. When the verification result is successful, the RFID tag identification result is determined based on the RFID tag identification data. In summary, the slave control unit obtains status synchronization data sent by the main control unit through the same communication link. The status synchronization data includes RFID tag identification data identified by the RFID module on the main control unit side and corresponding verification information. After receiving the status synchronization data, the slave control unit first verifies the RFID tag identification data based on the verification information, and determines the RFID tag identification result based on the RFID tag identification data when the verification is successful. Therefore, the slave control unit can determine the RFID identification result based on the RFID identification data from the master control unit, thereby reducing the need for repeated configuration of the RFID module on the slave control unit side. This helps to reduce hardware costs, reduce circuit layout space, and simplify the master-slave identification result synchronization logic. At the same time, the slave control unit does not directly and unconditionally use the data sent by the master control unit, but determines the RFID identification result only after verification. This reduces the risk of communication interference or abnormal data transmission causing the slave control unit to misjudge the RFID identification status, thus balancing product space, hardware costs, and the reliability of the RFID identification result on the slave control unit side.

[0035] Optionally, the RFID tag identification data includes RFID tag identification information and RFID tag identification status. In the step of determining the RFID tag identification result based on the RFID tag identification data when the verification result is successful, the RFID tag identification information can also be matched with the RFID tag identification information stored locally from the control unit to obtain the tag matching result; and the RFID tag identification result can be determined based on the tag matching result and the RFID tag identification status.

[0036] In this embodiment of the invention, after the control unit confirms that the state synchronization data verification is successful, it can further match the received RFID tag identification information with the RFID tag identification information pre-stored locally to determine whether the RFID tag currently identified by the main control unit is a target tag allowed in the security control scenario.

[0037] The RFID tag identification information stored locally on the control unit can be written during the factory configuration phase, or sent by the main control unit during the initialization and synchronization phase, or written during device pairing, authorization registration, or maintenance configuration. By storing the RFID tag identification information locally, the slave control unit can perform independent comparisons after receiving identification data sent by the main control unit, rather than relying entirely on the identification conclusion given by the main control unit, thereby improving the reliability of identification and judgment on the slave control unit side.

[0038] In this way, the control unit can not only confirm whether the data transmitted by the main control unit is complete, but also re-evaluate the received RFID tag identification information based on the tag identification information stored locally. This makes the RFID tag identification result subject to communication verification, tag matching and identification status constraints at the same time. This helps to avoid situations such as correct communication data but mismatched tag identity, or tags that have been removed but are still misjudged as valid, thereby improving the accuracy of RFID tag identification results in security control scenarios.

[0039] In one possible embodiment, the tag matching result may also include multiple result types such as successful matching, failed matching, missing data, abnormal format, or unauthorized tag. The control unit can set different processing methods for different result types. For example, it can trigger a security alarm for failed matching or unauthorized tags, maintain the previous valid identification result and wait for the next frame of status synchronization data for missing data or abnormal format, and enter a security protection state when consecutive abnormalities reach a preset number.

[0040] In one possible embodiment, to reduce the risk of RFID tag identification information being reused or forged during transmission between the master control unit and the slave control unit, the master control unit can also generate a dynamic identification field based on the RFID tag identification information and the frame sequence number corresponding to the status synchronization data, and send the dynamic identification field as part of the RFID tag identification data to the slave control unit. After the status synchronization data verification is successful, the slave control unit can generate a local expected identification field based on the locally stored RFID tag identification information and frame sequence number, and match the local expected identification field with the received dynamic identification field to determine the tag matching result.

[0041] Optionally, in the step of matching the RFID tag identification information with the RFID tag identification information stored locally in the control unit to obtain the tag matching result, multiple bytes in the RFID tag identification information can be compared byte by byte with multiple bytes in the RFID tag identification information stored locally in the control unit to obtain the comparison result; when the comparison result shows that a preset number of consecutive bytes match, the tag matching result is determined to be a successful match.

[0042] In this embodiment of the invention, after receiving the RFID tag identification information, the slave control unit can compare the received RFID tag identification information with the locally stored RFID tag identification information byte by byte in byte order. The RFID tag identification information can consist of multiple bytes, for example, a 16-byte tag ID. The slave control unit can start from the first byte and compare the received tag ID with the local tag ID sequentially to see if they match, and count the number of consecutive matching bytes; if the current byte matches, the comparison continues to the next byte; if the current byte does not match, the consecutive matching count can be cleared to zero, and the comparison of subsequent bytes can start again.

[0043] When the number of consecutive matching bytes reaches a preset number, the received RFID tag identification information is considered to match the RFID tag identification information stored locally in the control unit, thus determining the tag matching result as a successful match. For example, when the RFID tag identification information is a 16-byte tag ID, the preset number can be 16; when all 16 consecutive bytes received match the 16 bytes stored locally, it can be determined that the current RFID tag is a registered or authorized target tag. If any byte is inconsistent during the comparison process, it indicates that the received RFID tag identification information is not completely consistent with the RFID tag identification information stored locally, and the tag matching result can be determined as a failed match, or the system can continue to wait for subsequent status synchronization data for re-comparison.

[0044] By comparing tags byte-by-byte, the control unit can determine tag identity without relying on complex algorithms, making it easy to implement in resource-constrained control chips. Furthermore, a successful match is only considered complete after a predetermined number of consecutive matching bytes, reducing the risk of false matches due to accidental matching of a single byte and improving the accuracy of RFID tag identification results. For example, in industrial security door lock scenarios, the control unit is only allowed to use the tag matching result as a valid basis for subsequent security status determination when the received tag ID is continuously and completely identical to the locally stored authorized tag ID.

[0045] In one possible embodiment, the control unit can also determine whether the length, data format, or frame position of the RFID tag identification information meets preset requirements before byte-by-byte comparison. If the length is insufficient, the format is abnormal, or the frame position is incorrect, the tag matching result can be directly determined as a matching failure, and byte-by-byte comparison can be discontinued. This can reduce invalid data participating in the matching judgment and improve the data processing efficiency of the control unit.

[0046] Optionally, in the step of determining the RFID tag identification result based on the tag matching result and the RFID tag identification status, when the tag matching result is a successful match and the RFID tag identification status is in-situ, a first continuous confirmation of the in-situ status is performed to obtain a first continuous confirmation result; when the tag matching result is a failed match or the RFID tag identification status is removed, a second continuous confirmation of the failed match and / or removed status is performed to obtain a second continuous confirmation result; the RFID tag identification result is determined based on the first continuous confirmation result or the second continuous confirmation result; wherein the second number is greater than the first number.

[0047] In this embodiment of the invention, after obtaining the tag matching result and the RFID tag identification status, the control unit may not immediately update the RFID tag identification result based on a single judgment result. Instead, it may continuously confirm the in-situ status, the matching failure status, or the removal status to reduce the risk of misjudgment caused by instantaneous interference, occasional identification jitter, or short-term communication fluctuations. Specifically, when the tag matching result is a successful match and the RFID tag identification status is in-situ, it can be considered that the currently received RFID tag is consistent with the locally stored target tag and that the target tag is within the effective identification range. At this time, the control unit can perform the first continuous confirmation of the in-situ status. If the first continuous confirmation confirms that the tag is successfully matched and in-situ, the first continuous confirmation result is considered successful, and the RFID tag identification result can be determined as valid identification or the tag being in-situ.

[0048] When the tag matching result is "match failed," or the RFID tag identification status is "removed," it indicates that the current RFID tag may not be the target tag, or the target tag has left the effective identification range. Since the removal and matching failure statuses can be affected by factors such as RF signal attenuation, tag movement, and communication jitter, determining tag removal or identification abnormality based on a single judgment can easily lead to frequent false triggers of the safety control equipment. Therefore, the control unit can perform a second consecutive confirmation of the matching failure and / or removal statuses; only when the second consecutive count meets the matching failure and / or removal statuses is the second consecutive confirmation result considered successful, and the RFID tag identification result can be determined as invalid identification, tag removal, or tag abnormality.

[0049] The second count being greater than the first indicates a more cautious assessment of anomalies or removal directions, and a relatively faster assessment of restoration to the in-situ direction. For example, the first count could be 2, and the second count could be 9. When the target tag re-enters the valid identification range, the control unit can restore the identification validity status after a few more confirmations; when the target tag is suspected of being removed or the match has failed, more consecutive confirmations are required before updating to an invalid identification status. This method balances the response speed of RFID tag in-situ identification with the stability of removal and anomaly assessment, reducing jumps in RFID tag identification results caused by industrial field interference.

[0050] In one possible embodiment, the control unit can be configured with a bit confirmation counter and an error confirmation counter. When a judgment result satisfies the conditions of successful matching and being in the bit position, the bit position confirmation counter is incremented, and the error confirmation counter is cleared. When a judgment result satisfies the conditions of failed matching and / or removal, the error confirmation counter is incremented, and the bit position confirmation counter is cleared. After either counter reaches its corresponding threshold, the control unit updates the RFID tag identification result, thereby achieving continuous confirmation processing.

[0051] In another possible embodiment, when determining the RFID tag identification result based on the tag matching result and the RFID tag identification status, the slave control unit can also adaptively adjust the first count and the second count based on the stability of the status synchronization data. The first count and the second count are not fixed values, but are dynamically determined according to the communication status between the master control unit and the slave control unit, the continuity of the status synchronization data, and the jumps in the RFID tag identification status, so that the confirmation process of the RFID tag identification result can adapt to different communication environments.

[0052] Specifically, after obtaining the tag matching result and the RFID tag identification status, the control unit can first determine the status stability parameters corresponding to the current status synchronization data. These status stability parameters may include at least one of the following: consecutive successful verification count, number of failed verification count, frame sequence number continuity, status synchronization data reception interval, and the proportion of identical identification statuses occurring within a preset window. The consecutive successful verification count can be used to characterize whether the communication link between the master control unit and the slave control unit is stable within the current time period; frame sequence number continuity can be used to determine whether there are lost, duplicate, or out-of-order frames in the status synchronization data; and the proportion of identical identification statuses occurring within the preset window can be used to determine whether there is jitter in the RFID tag identification status.

[0053] When the state stability parameter indicates a stable communication link, continuous frame sequence numbers, and a high proportion of identical identification states within a preset window, the control unit can reduce the first and / or second counts to improve the response speed of the RFID tag identification results. For example, if multiple consecutive frames of state synchronization data pass verification and the RFID tag identification state remains in place, the first count can be set to a smaller value, allowing the control unit to quickly confirm the tag's presence.

[0054] When the stability parameter indicates communication link instability, verification failures, discontinuous frame sequence numbers, or frequent changes in RFID tag identification status, the control unit can increase the first and / or second counts to improve the anti-interference capability of the RFID tag identification results. Especially when the tag matching result is a failure, or the RFID tag identification status changes from in-situ to removed, increasing the second count allows the control unit to repeatedly confirm the matching failure or removal status before updating the RFID tag identification result to invalid identification or tag removal. This avoids misjudgments caused by momentary communication anomalies, RF signal jitter, or brief tag offsets.

[0055] In this embodiment, the second count can always be greater than the first count. That is, for confirming the tag's position orientation, fewer counts can be used to ensure response speed; for confirming tag removal, matching failure, or abnormal orientation, more counts can be used to ensure judgment stability. Through this adaptive adjustment method, the control unit can dynamically adjust the confirmation strategy based on the real-time stability of the status synchronization data, ensuring that the RFID tag identification results balance response speed and anti-interference capability.

[0056] Optionally, the verification information includes a cyclic redundancy check value; after verifying the RFID tag identification data in the status synchronization data based on the verification information and obtaining the verification result, the number of verification failures can be updated when the verification result is a verification failure; when the number of verification failures reaches a preset failure threshold, it is determined that there is a communication failure between the main control unit and the slave control unit.

[0057] In this embodiment of the invention, the cyclic redundancy check (CRUD) value can be used to determine whether an error occurred during the transmission of state synchronization data through the communication link. After receiving the state synchronization data from the control unit, the RFID tag identification data and the CRUD value can be parsed from it, and the check value is recalculated on the received RFID tag identification data according to the same CRUD algorithm as the main control unit. If the recalculated check value is consistent with the CRUD value carried in the state synchronization data, the check result can be determined as a successful check; if the two are inconsistent, the check result can be determined as a failed check.

[0058] When the verification result is a failure, the control unit can assume that the current state synchronization data may be affected by communication interference, data misalignment, byte loss, or abnormal frame content. Therefore, it will not use the current state synchronization data to update the RFID tag identification result, and will update the verification failure count. The verification failure count can be implemented using a counter. Each verification failure increments the counter; when subsequent state synchronization data verifications pass, the counter can be reset to zero, or the counter value can be reduced according to the fault tolerance strategy. This method avoids immediately triggering a communication failure due to a single communication anomaly, improving the stability of fault diagnosis.

[0059] When the number of verification failures reaches a preset failure threshold, it can be considered that the communication link between the master control unit and the slave control unit has experienced a continuous anomaly, and the slave control unit can confirm that a communication fault exists between the master control unit and the slave control unit. The preset failure threshold can be set according to the communication cycle, data refresh frequency, and security response requirements. For example, when status synchronization data is sent according to a fixed cycle, the preset failure threshold can be set to 200 times; when 200 consecutive verification failures correspond to approximately 900ms, the communication fault can be confirmed after the communication anomaly lasts for approximately 900ms, thus balancing anti-interference capability and fault response speed.

[0060] In one possible embodiment, after determining a communication failure, the control unit can trigger a security alarm, prevent the updating of RFID tag identification results, control the security output to enter a protection state, or write the fault code corresponding to the communication failure into a non-volatile memory such as Flash or EEPROM. Subsequent maintenance personnel can determine the source of the fault by reading the fault code, making it easier to distinguish between RFID tag identification abnormalities, communication link abnormalities, and main control unit abnormalities.

[0061] Optionally, before obtaining the status synchronization data sent by the main control unit through the communication link, the initialization synchronization data packet sent by the main control unit can also be obtained through the communication link. The initialization synchronization data packet includes device type, output type, RFID tag identification information, version number, and initialization verification information. Based on the initialization verification information, the initialization synchronization data packet is verified. If the initialization synchronization data packet passes the verification, the RFID tag identification information in the initialization synchronization data packet is stored.

[0062] In this embodiment of the invention, before receiving status synchronization data during operation, the slave control unit can first receive an initialization synchronization data packet sent by the master control unit to complete the basic parameter synchronization. The initialization synchronization data packet can be sent after power-on initialization, master-slave communication establishment, device parameter updates, or changes to RFID tag authorization information. The device type in the initialization synchronization data packet can be used to indicate the product category of the current security control device, such as a security door lock, security switch, or security relay; the output type can be used to indicate the security output form, such as single-channel output, dual-channel output, or OSSD output; the RFID tag identification information can be used to indicate the identity of the target tag that is allowed to be identified; the version number can be used to indicate the parameter version, program version, or protocol version currently used by the master control unit; and the initialization verification information can be used to determine whether the initialization synchronization data packet is complete during transmission.

[0063] After receiving the initialization synchronization data packet from the control unit, it first parses the device type, output type, RFID tag identification information, version number, and initialization verification information, and then verifies the initialization synchronization data packet according to preset verification rules. For example, the initialization verification information can be a CRC16 checksum. Before sending the initialization synchronization data packet, the main control unit calculates the CRC16 checksum based on the device type, output type, RFID tag identification information, and version number, and writes the CRC16 checksum into the initialization synchronization data packet. After receiving the initialization synchronization data packet from the control unit, it recalculates the checksum using the same CRC16 algorithm and compares it with the received initialization verification information. If they match, the initialization synchronization data packet verification is considered successful; if they do not match, the current initialization synchronization data packet can be discarded, and the main control unit can be asked to resend it.

[0064] If the initialization synchronization data packet verification passes, the slave control unit can store the RFID tag identification information from the initialization synchronization data packet as local reference data for subsequent tag matching. The RFID tag identification information can be stored in RAM, Flash, EEPROM, or other storage areas. For example, if the RFID tag identification information is a 16-byte tag ID, the slave control unit can write this 16-byte tag ID into the local parameter area. After receiving subsequent status synchronization data, the RFID tag identification information in the status synchronization data is compared byte-by-byte with the 16-byte tag ID in the local parameter area. In this way, the slave control unit does not need to re-acquire the target tag reference information during operation and can complete the local matching judgment based on the tag identification information that has been synchronized and verified during the initialization phase.

[0065] In one possible embodiment, the initialization synchronization data packet may further include a frame header, data length, locking mode, parameter validity flag, or end flag. For example, the initialization synchronization data packet may sequentially include a fixed frame header, a device type field, an output type field, a locking mode field, 16 bytes of RFID tag identification information, a high byte of the version number, a low byte of the version number, a high byte of the CRC16 algorithm, a low byte of the CRC16 algorithm, and an end flag. Organizing the initialization synchronization data packet in a fixed format facilitates quick location of each field from the control unit and reduces the risk of errors in parsing initialization parameters.

[0066] Optionally, when the verification result is successful, after determining the RFID tag identification result based on the RFID tag identification data, the RFID tag identification status of the control unit can be updated based on the RFID tag identification result; the RFID tag identification status can be associated with the safety output fault status, power failure status and communication fault status of the safety control system.

[0067] In this embodiment of the invention, after determining the RFID tag identification result, the control unit can convert the RFID tag identification result into a locally identifiable RFID tag identification status and update it in the local status register, status buffer, or status management module. The RFID tag identification status can include tag in-situ status, tag removed status, tag matching failure status, tag identification abnormal status, or tag identification valid status. For example, when the RFID tag identification result indicates that the target tag has been successfully matched and is in-situ, the control unit can update the local RFID tag identification status to valid identification; when the RFID tag identification result indicates that the target tag has been removed, the tag identifier does not match, or the identification data is abnormal, the control unit can update the local RFID tag identification status to invalid identification or identification abnormality.

[0068] After updating the RFID tag identification status from the control unit, the RFID tag identification status can be associated with security output fault status, power supply fault status, and communication fault status for management. Security output fault status can include OSSD output abnormality, output short circuit, output overload, or output disconnection; power supply fault status can include undervoltage, overvoltage, or power failure; communication fault status can include communication interruption between the master and slave control units, continuous verification failures, or synchronization data timeout. Through association management, RFID tag identification abnormalities are not treated as isolated states but can participate in the security control logic judgment along with other security-related faults.

[0069] For example, in a security door lock application scenario, if the RFID tag identification status is valid, and the security output fault status, power fault status, and communication fault status are all normal, the slave control unit can maintain the current normal security state. If the RFID tag identification status is tag removed or tag matching failed, even if the security output and power status are normal, the slave control unit can use this status as a basis for determining that the security control conditions are not met, and then cooperate with the master control unit to trigger the security output shutdown, lock the door, or issue a fault indication. As another example, when the RFID tag identification status is normal, but the communication fault status is abnormal, the slave control unit can also enter a security protection state to prevent security judgment failure due to master-slave data asynchrony.

[0070] In this way, the control unit can incorporate RFID tag identification results into a unified safety status management process. This allows the RFID tag identification status, along with critical statuses such as safety output, power supply, and communication, to form a basis for safety judgment, thereby improving the consistency and reliability of safety control logic. Compared to simply recording RFID tag identification results, this method enables RFID tag identification anomalies to be reflected in safety status management in a timely manner, facilitating subsequent execution of safety alarms, fault logging, output protection, or shutdown protection.

[0071] In one possible embodiment, the control unit can set status bits or fault codes for different states. For example, a first status bit can be set for RFID tag identification anomalies, a second status bit for safety output faults, a third status bit for power supply faults, and a fourth status bit for communication faults. The control unit can determine the final safety state based on the combination of multiple status bits, and control the safety output to enter the protection state when any critical status bit is abnormal. At the same time, the corresponding fault code is written to non-volatile memory for easy subsequent maintenance and fault tracing.

[0072] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0073] In one embodiment, an RFID tag identification device is provided, which corresponds one-to-one with the RFID tag identification method described in the above embodiments. For example... Figure 2 As shown, the RFID tag identification device includes an acquisition module 201, a verification module 202, and a determination module 203. Detailed descriptions of each functional module are as follows: The acquisition module 201 is used to acquire the status synchronization data sent by the main control unit through the communication link. The status synchronization data includes RFID tag identification data and verification information generated by the main control unit based on the RFID tag identification data. The RFID tag identification data is obtained by the main control unit through the RFID module to identify the RFID tag. The RFID tag identification data includes RFID tag identification information and RFID tag identification status. The RFID tag identification information is used to characterize the identity of the RFID tag. The RFID tag identification status includes an in-place status and a removed status. Verification module 202 is used to verify the radio frequency tag identification data in the status synchronization data based on the verification information, and obtain the verification result; The determination module 203 is used to determine the radio frequency tag identification result based on the radio frequency tag identification data when the verification result is that the verification is passed.

[0074] Optionally, the determining module 203 is further configured to: When the verification result is successful, the RFID tag identification information is matched with the RFID tag identification information stored locally from the control unit to obtain a tag matching result; Based on the tag matching result and the RFID tag identification status, the RFID tag identification result is determined.

[0075] Optionally, the determining module 203 is further configured to: The multiple bytes in the RFID tag identification information are compared byte by byte with the multiple bytes in the RFID tag identification information stored locally from the control unit to obtain the comparison result; When the comparison result shows that a preset number of consecutive bytes match, the tag matching result is determined to be a successful match.

[0076] Optionally, the determining module 203 is further configured to: When the tag matching result is a successful match and the RFID tag identification status is in place, the in-place status is confirmed for the first time to obtain the first continuous confirmation result. When the tag matching result is a match failure, or the RFID tag identification status is a removal status, a second continuous confirmation is performed on the tag matching result being a match failure and / or the removal status to obtain a second continuous confirmation result; The RFID tag identification result is determined based on the first or the second consecutive confirmation result; The second number is greater than the first number.

[0077] Optionally, the verification information includes a cyclic redundancy check value; after verifying the RFID tag identification data in the status synchronization data based on the verification information and obtaining the verification result, the device is further configured to: When the verification result is a verification failure, update the number of verification failures; When the number of verification failures reaches a preset failure threshold, it is determined that there is a communication failure between the main control unit and the slave control unit.

[0078] Optionally, before acquiring the status synchronization data sent by the main control unit through the communication link, the device is further configured to: The initialization synchronization data packet sent by the main control unit is obtained through the communication link. The initialization synchronization data packet includes device type, output type, RFID tag identification information, version number, and initialization verification information. Based on the initialization verification information, the initialization synchronization data packet is verified; If the initialization synchronization data packet passes verification, the RFID tag identification information in the initialization synchronization data packet is stored.

[0079] Optionally, after determining the RFID tag identification result based on the RFID tag identification data when the verification result is successful, the device is further configured to: The RFID tag identification status of the slave control unit is updated based on the RFID tag identification result; The identification status of the RFID tag is associated with the safety output fault status, power failure status, and communication fault status of the security control system.

[0080] Each module in the aforementioned RFID tag identification device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0081] In one embodiment, a computer device is provided, which may be a terminal device, and its internal structure diagram may be as follows: Figure 3As shown, the computer device includes a processor, memory, and network interface connected via a system bus. The processor provides computing and control capabilities. The memory includes a readable storage medium storing computer-readable instructions. The network interface communicates with external terminals via a network connection. When executed by the processor, the computer-readable instructions implement an RFID tag identification method. The readable storage medium provided in this embodiment includes both non-volatile and volatile readable storage media.

[0082] In this embodiment of the application, a readable storage medium is provided, which stores computer-readable instructions. When the computer-readable instructions are executed by a processor, they implement the steps of the radio frequency tag identification method described above.

[0083] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing related hardware with computer-readable instructions. These computer-readable instructions can be stored in a non-volatile readable storage medium or a volatile readable storage medium. When executed, these computer-readable instructions can include the processes of the embodiments of the methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0084] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0085] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for identifying radio frequency tags, characterized in that, The method is applied to a slave control unit of a security control system, which further includes a master control unit. The master control unit is equipped with a radio frequency identification (RFID) module, and the master control unit and the slave control unit are connected to the same communication link. The method includes: The status synchronization data sent by the main control unit is obtained through the communication link. The status synchronization data includes RFID tag identification data and verification information generated by the main control unit based on the RFID tag identification data. The RFID tag identification data is obtained by the main control unit through the RFID module to identify the RFID tag. The RFID tag identification data includes RFID tag identification information and RFID tag identification status. The RFID tag identification information is used to characterize the identity of the RFID tag. The RFID tag identification status includes in-place status and removed status. Based on the verification information, the RFID tag identification data in the status synchronization data is verified to obtain the verification result; When the verification result is successful, the RFID tag identification result is determined based on the RFID tag identification data; When the verification result is successful, determining the RFID tag identification result based on the RFID tag identification data includes: When the verification result is successful, the RFID tag identification information is matched with the RFID tag identification information stored locally from the control unit to obtain the tag matching result; Based on the tag matching result and the RFID tag identification status, the RFID tag identification result is determined; The verification information includes a cyclic redundancy check value; after verifying the RFID tag identification data in the status synchronization data based on the verification information and obtaining the verification result, the method further includes: When the verification result is a verification failure, update the number of verification failures; When the number of verification failures reaches a preset failure threshold, it is determined that there is a communication failure between the main control unit and the slave control unit.

2. The radio frequency tag identification method as described in claim 1, characterized in that, The step of matching the RFID tag identification information with the RFID tag identification information stored locally from the control unit to obtain the tag matching result includes: The multiple bytes in the RFID tag identification information are compared byte by byte with the multiple bytes in the RFID tag identification information stored locally from the control unit to obtain the comparison result; When the comparison result shows that a preset number of consecutive bytes match, the tag matching result is determined to be a successful match.

3. The radio frequency tag identification method as described in claim 1, characterized in that, The step of determining the RFID tag identification result based on the tag matching result and the RFID tag identification status includes: When the tag matching result is a successful match and the RFID tag identification status is in place, the in-place status is confirmed for the first time to obtain the first continuous confirmation result. When the tag matching result is a match failure, or the RFID tag identification status is a removal status, a second continuous confirmation is performed on the tag matching result being a match failure and / or the removal status to obtain a second continuous confirmation result; The RFID tag identification result is determined based on the first or the second consecutive confirmation result; The second number is greater than the first number.

4. The radio frequency tag identification method as described in claim 1, characterized in that, Before obtaining the status synchronization data sent by the main control unit through the communication link, the method further includes: The initialization synchronization data packet sent by the main control unit is obtained through the communication link. The initialization synchronization data packet includes device type, output type, RFID tag identification information, version number, and initialization verification information. Based on the initialization verification information, the initialization synchronization data packet is verified; If the initialization synchronization data packet passes verification, the RFID tag identification information in the initialization synchronization data packet is stored.

5. The radio frequency tag identification method as described in claim 1, characterized in that, When the verification result is successful, after determining the RFID tag identification result based on the RFID tag identification data, the method further includes: The RFID tag identification status of the slave control unit is updated based on the RFID tag identification result; The identification status of the RFID tag is associated with the safety output fault status, power failure status, and communication fault status of the security control system.

6. A radio frequency tag identification device, characterized in that, The device is applied to a slave control unit of a security control system, which also includes a master control unit. The master control unit is equipped with a radio frequency identification (RFID) module, and the master control unit and the slave control unit are connected to the same communication link. The device includes: The acquisition module is used to acquire status synchronization data sent by the main control unit through the communication link. The status synchronization data includes RFID tag identification data and verification information generated by the main control unit based on the RFID tag identification data. The RFID tag identification data is obtained by the main control unit through the RFID module to identify the RFID tag. The RFID tag identification data includes RFID tag identification information and RFID tag identification status. The RFID tag identification information is used to characterize the identity of the RFID tag, and the RFID tag identification status includes in-place status and removed status. The verification module is used to verify the radio frequency tag identification data in the status synchronization data based on the verification information, and obtain the verification result; The determination module is used to determine the RFID tag identification result based on the RFID tag identification data when the verification result is that the verification is passed. The determining module is further configured to: When the verification result is successful, the RFID tag identification information is matched with the RFID tag identification information stored locally from the control unit to obtain the tag matching result; Based on the tag matching result and the RFID tag identification status, the RFID tag identification result is determined; The verification information includes a cyclic redundancy check value; after verifying the RFID tag identification data in the status synchronization data based on the verification information and obtaining the verification result, the device is further configured to: When the verification result is a verification failure, update the number of verification failures; When the number of verification failures reaches a preset failure threshold, it is determined that there is a communication failure between the main control unit and the slave control unit.

7. A computer device comprising a memory, a processor, and computer-readable instructions stored in the memory and running on the processor, characterized in that, When the processor executes the computer-readable instructions, it implements the radio frequency tag identification method as described in any one of claims 1 to 5.

8. A readable storage medium having computer-readable instructions stored thereon, characterized in that, When the computer-readable instructions are executed by a processor, they implement the radio frequency tag identification method as described in any one of claims 1 to 5.

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