RFID reader-writer and method for externally controlling on-off of RFID reader-writer
A technology of RFID tags and readers, which is applied in the direction of instruments, computer parts, electromagnetic radiation induction, etc., can solve the problems of long time consumption and unfixed time
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Embodiment 1
[0029] Example 1, such as figure 2 As shown, the RFID reader includes a photoelectric switch, a system controller, a reader, a radio frequency switch, a load, and an antenna; the output end of the photoelectric switch is connected to the control port C1 of the radio frequency switch through a signal line; the system controller communicates through commands line (the instruction communication line here can be a network cable or an RS232 serial port line) connected to the reader, and the reader is always in the working state, so that the RF port of the reader outputs RF signals; the RF port of the reader passes through the feeder It is connected with the input port In of the radio frequency switch; the first output port Out1 of the radio frequency switch is connected with the 50 ohm load through the feeder line, and the second output port Out2 is connected with the antenna through the feeder line.
[0030] In the initial state, the port In of the RF switch is connected to the f...
Embodiment 2
[0033] Example 2, such as image 3As shown, the RFID reader includes a photoelectric switch, a low-delay level pulse width conversion unit, a system controller, a reader, a radio frequency switch, a load, and an antenna. The input terminal In of the flat pulse width conversion unit is connected, the output terminal out of the low-delay level pulse width conversion unit is connected to the control port C1 of the radio frequency switch, and the connection mode of other components is the same as that of the first embodiment.
[0034] The low-latency level pulse width conversion unit is a programmable logic device such as PLC, CPLD or FPGA.
Embodiment 3
[0036] A method for externally controlling the on-off of the RFID reader, mainly using the method of installing an externally connected radio frequency switch between the radio frequency port of the reader and the antenna, and controlling the radio frequency port of the reader by switching the radio frequency switch Whether the output energy reaches the antenna or not, in disguise, the reader can read or stop working.
[0037] Since the switching time of the radio frequency switch is at the level of nanoseconds, the time for controlling the operation of the reader through instructions is at the level of milliseconds. Through this method, the control time can be reduced by several orders of magnitude, and the time precision can be improved by several orders of magnitude.
[0038] The specific steps are:
[0039] A. When the work starts, the system controller controls the reader to be in the working state all the time, so that the RF port of the reader outputs the RF signal, an...
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