Device matching state wireless passive detection system and method based on ultrahigh frequency RFID

Abstract

The invention discloses a wireless passive detection system and method for an equipment matching state based on ultrahigh frequency RFID, which are applied to the field of interface pairing detection, and aim at solving the problems that in the prior art, equipment connection relations are manually recorded, serial numbers need to be pasted on equipment and interfaces, the workload is large, and errors are extremely easy to occur; and a manual recording method is adopted, so that the time consumption is long and the timeliness is poor. According to the invention, the reader-writer is adopted to identify the state of a group of passive tags to judge whether a certain port is connected with equipment, the equipment connection relation can be directly detected in a wireless and passive manner, manual detection is not needed, the detection efficiency is improved, the problem of manual subjective detection errors is eliminated, the function of automatically detecting the connection relation is realized, and the detection efficiency is improved. And the RFID tag works in a wireless passive mode, so that the service life of the system is prolonged, and the cost of the system is further reduced.

Description

Technical Field

[0001] The invention belongs to the field of interface pairing detection, and in particular relates to a multi-input multi-output system interface connection pairing detection technology. Background Art

[0002] In a multi-input multi-output system (such as a fiber optic switch), how to quickly and accurately locate which input and output interfaces are connected to external devices and which devices are connected to which input and output interfaces can reduce the cost of subsequent maintenance and repair, shorten the failure time, and reduce user losses, which has important practical application value. However, existing methods often use manual recording (during installation) and on-site manual inspection (in case of failure) to obtain the connection relationship between interfaces and devices, which is extremely inefficient. Especially when the number of devices is large and the connection lines of multiple devices are intertwined, it is difficult to distinguish which input and output interface the device is connected to, which brings great safety hazards to subsequent maintenance. Therefore, there is an urgent need for an efficient device connection status detection method to realize the functions of automatically detecting which ports are connected to devices, which ports are not connected to devices, and which devices are connected to which ports.

[0003] The existing technology uses manual recording of device connection relationships, which requires pasting numbers on devices and interfaces, which is labor-intensive and prone to errors. In addition, the manual recording method is time-consuming and has poor timeliness. At the same time, if the operator operates improperly and connects the device to a port different from the recorded data, it will lead to difficult-to-troubleshoot results. After an error is found, all interfaces need to be tested to determine whether there are still errors.

[0004] The disadvantages of the existing technology are: manual maintenance is labor-intensive, time-consuming, and has poor timeliness. It is necessary to maintain the data table of the connection relationship of each interface at all times. If the interface device is frequently plugged in and out and the connection interface is switched, it is difficult to update the data table in time, which brings great trouble to subsequent maintenance. At the same time, if an error is found, all interfaces need to be checked to determine whether there is still an erroneous connection relationship. The workload is huge and there is a risk of subjective human error. Summary of the invention

[0005] To solve the above technical problems, the present invention proposes a wireless passive detection system and method for device matching status based on ultra-high frequency RFID (Radio Frequency Identification), including a reader and multiple passive tags. By setting the correspondence between two passive tags, the correspondence between ports and devices can be directly obtained according to the tag pairs identified by the reader.

[0006] One of the technical solutions adopted by the present invention is: a wireless passive detection system for device matching status based on ultra-high frequency RFID, including a reader and a plurality of passive tags, wherein the passive tags are divided into Class A tags and Class B tags, wherein the Class A tags are arranged on the connection line of the device, and the Class B tags are arranged on each interface of the multi-input multi-output system;

[0007] The Class A label on the connection line of the device connected to the multi-input and multi-output system is connected to the Class B label on the interface to which it is connected through a wired connection;

[0008] Type A and B tags are powered by RF energy emitted by the reader;

[0009] The reader / writer realizes the inventory of the Class B tags connected to the Class A tags by controlling the control signal output by the Class A tags to be high level.

[0010] Furthermore, the Class A tag controls the connection state of the Class B tag antenna through an NMOS tube. Specifically, the control signal output port of the Class A tag is connected to the gate of the NMOS tube, and the source and drain are respectively connected to the RFP of the Class B tag and one end of the corresponding antenna.

[0011] When the control signal is at a low level, the NMOS is turned off, and the Class B tag cannot reflect the signal. When the control signal is at a low level, the NMOS is turned on, and the Class B tag reflects the signal.

[0012] The second technical solution adopted by the present invention is: a wireless passive detection method for device matching status based on ultra-high frequency RFID, based on the above detection system, the detection method includes the following steps:

[0013] A1. The reader is initialized and sends a radio frequency signal.

[0014] A2, Class A tags and Class B tags receive the RF signal from the reader and are powered on;

[0015] A3. The reader starts counting the tags, and the tags reflect their own IDs (Class A tags and Class B tags can be distinguished by their IDs);

[0016] A4. When the reader receives the tag reflection signal, it determines whether it is a Class A tag. If so, it executes step A5, otherwise it returns to step A3;

[0017] A5. Select a specific Class A tag and send a pairing command;

[0018] A6. If the selected Class A tag returns a response signal, execute step A7, otherwise continue to send the pairing command;

[0019] A7. The reader counts the tags again, and the tags reflect their own IDs;

[0020] A8. If one Class B tag is counted, the pairing is successful; otherwise, the process ends.

[0021] Beneficial effects of the present invention: The present invention proposes a method for realizing port connection pairing of a multi-input and multi-output system by using ultra-high frequency RFID technology, which can directly detect the device connection relationship in a wireless passive manner without manual detection, thereby improving the detection efficiency and avoiding manual subjective detection errors. The wireless passive working mode increases the service life of the system and further reduces the system cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a system of m×n input and output interfaces;

[0023] Figure 2 A schematic diagram of a wireless passive detection architecture showing the connection relationship of m×n input and output interface systems;

[0024] Figure 3 A circuit architecture diagram for pairing interface devices based on tag status control;

[0025] Among them, (a) uses impedance transformation to achieve tag state switching, and (b) uses antenna conduction state to achieve tag state switching;

[0026] Figure 4 Reader and tag workflows paired for an interface controlled based on tag status;

[0027] Among them, (a) is the reader-writer workflow, (b) is the Class A tag workflow, and (c) is the Class B tag workflow. DETAILED DESCRIPTION

[0028] To facilitate those skilled in the art to understand the technical content of the present invention, the present invention is further explained below with reference to the accompanying drawings.

[0029] like Figure 1 The figure shows the structure of a device (such as a switch) with m×n input and output interfaces, where interface 1n, interface 21, interface 23, interface 2n, interface m1, and interface m3 indicate that external devices are connected (via connecting cables). The traditional method is to establish a connection relationship correspondence table on the computer side. If the connection relationship changes, the table needs to be updated in time. If the interface device is frequently plugged in and out and the interface is switched, it is difficult to update the data table in time, which greatly increases the subsequent maintenance cost.

[0030] To this end, the present invention proposes a wireless passive detection method for device matching status based on ultra-high frequency RFID, and its system architecture is as follows: Figure 2As shown. Among them, the tag Apq (type A tag) is placed on the connecting line (such as on the optical fiber connector), and the tag Bij (type B tag) is placed above each interface. The arrow indicates the connecting line between Apq and Bij. The tag Apq is a regular tag and can be normally identified by the reader (the device that communicates with the tag), while the tag Bij needs to work under the control of the tag Apq. The connecting line between Apq and Bij is used for Apq to control Bij. Only the interface connected to the tag Apq (that is, connected to the device) can work with its corresponding tag Bij. After the reader scans once, we can clearly know which interfaces are connected to the device based on whether the reader can identify the tag Bij and the pairing relationship between Apq and Bij, without having to maintain the connection relationship comparison table all the time.

[0031] In order to reduce the cost brought by the labels, the present invention proposes that both Class A and Class B tags adopt ultra-high frequency RFID passive tags that comply with the ISO / IEC 18000-6C standard, which are powered by collecting the radio frequency energy emitted by the reader and writer, and do not require battery power. Among them, the Class B tag is fixed on the input and output device and corresponds to the interface position (the Class B tag can also be replaced, and the corresponding relationship between the new tag and the interface needs to be entered after replacement), but the Class A tag is movable and the corresponding relationship with the Class B tag may change at any time. Therefore, it is necessary to record the corresponding relationship between the Class A tag and the Class B tag in real time to determine the interface usage, so as to achieve connection relationship pairing. Because Class A and Class B tags are both passive tags, it is difficult for the tags to communicate wirelessly. Therefore, to achieve the pairing relationship of passive tags, they can only be connected by wire to achieve communication between Class A tags and Class B tags, such as Figure 2 As shown by the arrow in the middle, the type A tag and the type B tag are wiredly connected.

[0032] To realize the interface pairing function, the present invention proposes two circuit architectures: 1) using impedance transformation technology to realize the tag state switching function, such as Figure 3 (a) as shown; 2) using the antenna conduction state to realize the tag state switching function, such as Figure 3 (b) as shown.

[0033] exist Figure 3In (a), the A-type tag controls the working state of the B-type tag through the control signal, inverter and NMOS. When the control signal is low, the inverter outputs high, the NMOS is turned on, and the tag antenna is connected to the ground through a 50Ω resistor (including the NMOS on-resistance). The B-type tag cannot reflect the signal. When all the A-type tags are powered on, the control signal is low, and the reader cannot identify the B-type tag. When the reader controls a certain A-type tag to make its control signal high, the NMOS is turned off, and the reader can count the B-type tag. The reader can realize the pairing of the A-type tag and the B-type tag according to the B-type tag counted and the A-type tag being controlled, and further realize the interface pairing. RF switches can also be used instead of NMOS tubes and inverters.

[0034] exist Figure 3 In (b), the Class A tag controls the connection status of the Class B tag antenna through NMOS. When the control signal is at a low level, the NMOS is cut off, and the Class B tag cannot reflect the signal. When all Class A tags are powered on, the control signal is at a low level, and the reader cannot identify the Class B tag. When the reader controls a Class A tag to make its control signal high, the NMOS is turned on, and the reader can count the Class B tags. The reader can pair the Class A tags with the Class B tags based on the counted Class B tags and the Class A tags being controlled, and further realize interface pairing.

[0035] in, Figure 3 The solution (a) does not affect the performance of the Class B tag antenna, but its design is more complicated. If the Class A tag is low on power, causing the NMOS tube to be in the cut-off state, the reader can count many Class B tags, making it impossible to achieve interface pairing. Figure 3 Solution (b) will affect the performance of the B-type tag antenna and require the antenna to be redesigned. However, when the A-type tag is low on power, the NMOS tube is in the cut-off state, and the reader cannot count the B-type tag. Only when the control signal output by the A-type tag controlled by the reader is high, the reader can count the corresponding B-type tag, which can reduce the risk of mismatching (the isolation of the transistor is limited, and there is still a risk of mismatching). Therefore, when the impact of NMOS on the performance of the B-type tag antenna is not considered (the antenna can be optimized as much as possible according to the conduction characteristics of the NMOS tube), controlling the B-type tag by controlling the antenna conduction can improve the reliability of interface pairing.

[0036] The interface pairing system workflow based on tag status control is as follows Figure 4 As shown, Figure 4 (a) is the reader-writer workflow, including the following steps:

[0037] A1. The reader starts counting tags after initialization;

[0038] A2. When the reader receives the tag reflection signal, it determines whether it is a Class A tag. If so, it executes step A3, otherwise it returns to step A1;

[0039] A3. Select a specific Class A tag and send a pairing command;

[0040] A4. If the selected Class A tag returns, execute step A5, otherwise continue to send the pairing command;

[0041] A5. The reader counts the tags again;

[0042] A6. If one Class B tag is counted, the pairing is successful; otherwise, the process ends.

[0043] like Figure 4 (b) is the A-type labeling workflow, which includes the following steps:

[0044] B1. Type A tags are powered on, initialized, and wait for inventory commands;

[0045] B2. If the A-type tag receives the inventory command, it returns its ID (EPC) and waits for the pairing command; otherwise, it continues to wait for the inventory command;

[0046] B3. If the A-type tag receives the pairing command, it first returns a response signal, then enables the B-type tag to start working, and waits for another inventory command; otherwise, it continues to wait for the pairing command;

[0047] B4. If the Class A tag receives another inventory command, it returns the ID (EPC) of the Class A tag and then ends.

[0048] like Figure 4 (c) is the B-type labeling workflow, which includes the following steps:

[0049] C1. Class B tags are powered on, initialized, and wait for the enable signal;

[0050] C2, if the enable signal is high, wait for the inventory command; otherwise, continue to wait for the enable signal;

[0051] C3. If the Class B tag receives the inventory command, the ID (EPC) of the Class B tag is returned and the process ends; otherwise, the process continues to wait for the inventory command.

[0052] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the scope of protection of the present invention is not limited to such specific statements and embodiments. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A wireless passive detection system for device matching status based on ultra-high frequency RFID, characterized in that: It includes a reader and several passive tags. Passive tags are divided into Class A tags and Class B tags. Class A tags are set on the connection line of the device, and Class B tags are set on each interface of the multi-input multi-output system. The Class A label on the connection line of the device connected to the multi-input multi-output system is connected to the Class B label on the interface to which it is connected through a wired connection; Type A and B tags are powered by RF energy emitted by the reader; The reader / writer realizes the inventory of the Class B tags connected to the Class A tags by controlling the control signal output by the Class A tags to be high level.

2. According to claim 1, a wireless passive detection system for device matching status based on ultra-high frequency RFID is characterized in that: Class A tags use NMOS tubes to control the connection status of Class B tag antennas. Specifically, the control signal output port of the Class A tag is connected to the gate of the NMOS tube, and the source and drain of the NMOS tube are respectively connected to the RFP of the Class B tag and one end of the corresponding antenna.

3. The device matching status wireless passive detection system based on ultra-high frequency RFID according to claim 2 is characterized in that: When the control signal is at a low level, the NMOS is turned off, and the Class B tag cannot reflect the signal. When the control signal is at a high level, the NMOS is turned on, and the Class B tag reflects the signal.

4. The device matching status wireless passive detection system based on ultra-high frequency RFID according to claim 1 is characterized in that: Class A tags use inverters and NMOS tubes to control the connection status of Class B tag antennas. Specifically, the control signal output port of the Class A tag is connected to the inverter input, the inverter output is connected to the gate of the NMOS tube, the drain of the NMOS tube is connected to the RFP of the Class B tag, and the source of the NMOS tube is connected to the RFN of the Class B tag through a resistor.

5. The device matching status wireless passive detection system based on ultra-high frequency RFID according to claim 4 is characterized in that: When the control signal is at a low level, the NMOS is turned on, and the antenna at one end of the RFN of the Class B tag is grounded through a resistor and cannot reflect the signal. When the control signal is at a high level, the NMOS is turned off, and the Class B tag reflects the signal.

6. A wireless passive detection method for device matching status based on ultra-high frequency RFID, characterized in that: Based on the detection system of claim 3 or 5, the detection method comprises the following steps: A1. The reader is initialized and sends a radio frequency signal. A2, Class A tags and Class B tags receive the RF signal from the reader and are powered on; A3. The reader starts counting tags, and the tags reflect their own IDs. A4. When the reader receives the tag reflection signal, it determines whether it is a Class A tag. If so, it executes step A5, otherwise it returns to step A3; A5. Select a specific Class A tag and send a pairing command; A6. If the selected Class A tag returns a response signal, execute step A7, otherwise continue to send the pairing command; A7. The reader counts the tags again, and the tags reflect their own IDs; A8. If one Class B tag is counted, the pairing is successful; otherwise, the process ends.

7. The method for wireless passive detection of device matching status based on ultra-high frequency RFID according to claim 6 is characterized in that: In step A6, after the Class A tag receives the pairing command and returns a response signal, it also includes enabling the Class B tag connected to it, so that the Class B tag connected to it starts to work.

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