JPH0652879B2 - ID system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an ID system for transmitting and receiving a signal between an interrogator and a responder which are installed apart from each other.

[Prior Art] For example, in a system that performs flow production using a belt conveyor, after confirming that the devices that perform the work have been sent normally, it is possible to perform the work efficiently if you prepare for the work. proceed. In this way, I
D system can be used. In this type of ID system, a transponder formed in a code shape is attached to a mobile body, and an interrogator that performs wireless communication with the transponder is installed apart from the transponder. In addition, when the transponder does not have a built-in power supply, for example, a battery, and the power required by the transponder is supplied from the interrogator by spatial transmission, both of them are used for communication between the transponder and the interrogator. It is necessary to confirm whether or not the communication between them is already possible, that is, whether or not it has been established. Therefore, actual communication is performed between the interrogator and the responder, for example, data reading is performed and it is confirmed whether the contents match.

For example, as shown in FIG. 4, the interrogator transmits the interrogation signal “a” shown in FIG. 4 (a) to the transponder at a certain time interval, and the transponder receives the interrogation signal “a”. When it is received within the area, the system of sending the response signal "b" shown in FIG. 4 (b) to the interrogator is adopted.

[Problems to be Solved by the Invention] However, in this method, when the power of the transponder is turned on as shown in FIG. 5 (b) while the interrogation signal is being sent as shown in FIG. The instrument will receive an imperfect signal as shown in Figure 5 (c). Therefore, there is a problem that both the hardware and the software are complicated to perform the correction.

[Means for Solving the Problem] In order to solve such a problem, according to the present invention, a transponder resets at the time of power-on, a specific signal is transmitted to the interrogator after the reset, and this signal is transmitted. When the interrogator receives the confirmation signal, the interrogator transmits a confirmation signal to the responder, and the interrogator and the responder start communication in the activated state.

[Operation] When the power of the responder rises, a get-up signal is transmitted, and the interrogator receiving the signal recognizes the rise of the power of the responder and transmits a confirmation signal. The transponder receiving the confirmation signal confirms that the transmitted signal is received by the interrogator. After that, the interrogator sends out an interrogation signal when necessary,
The responder returns a response signal in response.

[Embodiment] FIG. 1 is a block diagram showing an embodiment of the present invention.
In the figure, an ID system 11 comprises an interrogator 1 and a responder 2. The interrogator 1 has an interface 3 and is connected to an external device, for example, a program controller 4 in a wired manner, for example, and normally communicates according to a command from this controller. Further, the interrogator 1 is provided with a first wireless communication device 5, and the wireless communication device 5 sends an interrogation signal to the responder 2. An energy supply device 6 that spatially transmits energy is provided to the responder 2.

Further, in the interrogator 1, the first control circuit 7 controls the interface 3, the wireless communication device 5, and the energy supply device 6 in a predetermined manner. The responder 2 transmits a get-up signal to the wireless communication device 5 of the interrogator 1 when the power is turned on and receives a confirmation signal from the wireless communication device 5, and the inquiry from the wireless communication device 5 is received during normal operation. A second wireless communication device that receives a signal and transmits a response signal to the wireless communication device 5 is provided.

Then, the second control circuit 9 controls the wireless communication device 8 and holds appropriate data in the memory 10. Further, an energy reset device 13 and an initial reset circuit 12 that resets a predetermined circuit when the power is turned on are provided. The energy conversion device 13 converts the energy sent from the energy supply device 6, for example, microwave, into electric energy and creates an operating power supply for the responder 2. The wireless communication devices 5 and 8, the energy supply device 6,
The energy conversion device 13 is provided with antennas 15 to 18, respectively.

In the device configured as described above, when a command is first input from the program controller 4 to the interface 3 control circuit 7, the control circuit 7 drives the energy supply device 6 by the command. As a result, the energy supply device 6 radiates microwaves from the antenna 17.

At this time, when the transponder 2 enters a region where microwaves can be taken in, the microwaves are supplied to the energy conversion device 13 via the antenna 18 of the transponder 2, whereby the transponder 2 is transmitted.
To get the power needed. When the voltage shown in FIG. 2 (a) from the energy conversion device 13 reaches the voltage required to operate the transponder 2 at time t ₁ , as shown in FIG. 2 (d), the initial reset circuit 12 causes A reset signal is sent to reset a predetermined circuit. At this time, the control circuit 9 performs a pre-programmed operation as shown in the flowchart of FIG.

That is, after the reset (step 101), initializing (step 102), followed by get-up signal "b represented by the particular signals that transponder 2 at time t ₂ as shown in FIG. 2 (b) Is sent (step 103). This get-up signal is radiated from the wireless communication device 8 to the interrogator 1 via the antenna 16.

In the interrogator 1, the signal is received by the wireless communication device 5 via the antenna 15, whereby the interrogator 1 confirms that the transponder 2 has started up, that is, the power supply of the transponder 2 has reached the voltage required for operation. Check. At the same time, the interrogator 1 has a second
As shown in FIG. 6C, at time t ₃ , the wireless communication device 5 sends the confirmation signal “C” to the transponder 2 via the antenna 15, and the transponder 2 receives this (step 10).
Four).

After that, as shown in FIG. 2 (c), at the time t ₅ , the interrogator 1
Sends an interrogation signal "d" to the transponder 2, which responder 2, as shown in FIG. 2 (b) with respect to, and returns a response signal "b" at time t _6. That is, after the time point t _4, normal operation is started (step 105). Therefore, the rise time of the ID system is before the normal operation.

Basically, it is not necessary to communicate with each other after entering normal operation, but if the device including the transponder is sent by belt and the speed changes as it approaches a predetermined place, the interrogator will An interrogation signal can be sent to know the speed change of the responder.

In the example of FIG. 1, the interrogator 1 is provided with an antenna individually for the energy supply device and the wireless communication device, but this may be a single antenna using a duplexer. The transmitter and the energy supply device may be connected to one antenna, and the receiver of the wireless communication device may be a dedicated antenna. In this case, the wireless communication device does not need to switch between transmission and reception, and the transmitters of the energy supply device and the wireless communication device handle almost the same transmission level, so a simple duplexer can be used. Also, the transponder may have the same configuration, and may be shared by the energy conversion device of one antenna and the wireless communication device, and the antennas may be separated according to the transmission relation and the reception relation.

The medium for transmitting energy from the interrogator 1 to the responder 2 is not limited to microwaves, and electromagnetic induction, light, or the like can be used.

[Effects of the Invention] As described above, the present invention transmits a specific signal to an interrogator after initializing the control circuit of a transponder, and when the interrogator receives this signal, the interrogator outputs the signal. Since the confirmation signal is transmitted to the transponder, communication can be started in a state where both the interrogator 1 and the transponder 2 are activated, and hence stable communication can be achieved without complicated hardware and software as in the conventional case. It has an effect that an operation can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a partial wave system diagram of the apparatus shown in FIG. 1, FIG. 3 is a flow chart in a control circuit of a transponder, and FIG. 4 and FIG. It is an operation wave system diagram in a conventional system. 1 ... Interrogator, 2 ... Responder, 3 ... Interface, 4 ... Program controller, 5, 8 ... Wireless communication device, 6 ... Energy supply device, 7, 9 ... Control device, 10 ... Memory, 11 ... ID system, 12 ... Initial reset circuit, 13 ... Energy conversion device, 15-18 ...
…antenna.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Shinichi Haruyama 7-5-11 Takinogawa, Kita-ku, Tokyo Inside Yokoo Manufacturing Co., Ltd. (72) Inventor Yuichi Kagoshima 7-5-11 Takinogawa, Kita-ku, Tokyo Stock company Yokoo Works

Claims (1)

[Claims] 1. An interrogator and a transponder, which are arranged apart from each other and perform wireless communication with each other, and the transponder operates by taking in energy supplied by spatial transmission from the interrogator. In an ID system in which a response signal is wirelessly transmitted from a responder to an interrogator in response to an interrogation signal wirelessly transmitted to the responder, the responder is a predetermined circuit which is performed when the energy enters from the interrogator. Is equipped with means for wirelessly transmitting a get-up signal after completion of initial reset of the interrogator, and the interrogator is provided with means for recognizing completion of power-on of the responder when the get-up signal is received and wirelessly transmitting a confirmation signal to the responder. ID characterized by
system.