JPH0614527Y2 - Data transmission / reception system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a data transmission / reception system including an interrogator and a plurality of transponders. The present invention relates to a data transmission / reception system that transmits / receives one-to-one data.

[Conventional technology]

As a data transmission / reception system of this type, a system has been conventionally used in which frequencies are individually assigned to a plurality of transponders, and data is transmitted / received using the frequency corresponding to the transponder to which the interrogator should communicate. Are known.

[Problems to be solved by the device]

However, in such a system, a unique circuit is required for each responder, and a complicated circuit configuration is also required on the interrogator side, so that the system becomes complicated and expensive. There was a problem.

The present invention provides a data transmission / reception system capable of easily performing one-to-one transmission / reception with the interrogator sequentially at each response time when a large number of transponders exist in a space capable of transmitting / receiving with the interrogator. The purpose is to

[Means for Solving the Problems]

Therefore, the present invention is a data transmission / reception system for mutually transmitting and receiving data by electromagnetic waves between an interrogator connected to a host computer and a plurality of responders, and a data output request instructed by the host computer. In a data transmission / reception system in which the plurality of responders output data in response to an interrogation signal from the interrogator according to an instruction, the plurality of responders include a timer and a time measured by the timer after receiving the interrogation signal. And an output means for outputting the data, the interrogator,
It is characterized by further comprising timer detection means for receiving only data from the responder designated by the data output request command from the host computer.

[Action]

According to the present invention, when there are a plurality of transponders within the range where the radio wave from the interrogator can be received, the transponders have different transmission standby times for the interrogation signal from the interrogator, so that the transponders can be individually transmitted. It becomes possible to communicate between the responder and the interrogator. That is, the responder responds to the interrogation signal from the interrogator one by one after the given waiting time,
In the interrogator, by collecting only the data from the transponder required by the timer detection means, it is possible to avoid the radio wave interference from the transponder, and the interrogator is arranged to store the data from the transponder. The capacity of the storage device can be reduced.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an example of the configuration of the data transmission / reception system of the present invention. Here, it is assumed that the transponders 1-1 to 1-N are mounted on a moving object, and the interrogator 3 and the transponders 1-1 to 1-N are in a positional relationship capable of transmitting and receiving by using radio waves.

The interrogator 3 converts a data output request command instructed by the host computer 2 into a predetermined data format by a control unit (hereinafter referred to as a microcomputer) 34 such as a microcomputer in the interrogator 3, and transmits a modulation signal to the transmission circuit 32. give,
The transmission antenna 3 radiates a data output request (call signal 40) to all responders as a radio wave. The transponder that has received the data output request via the receiving antenna 10 and the receiving circuit 12 is, under the control of the microcomputer 14, a transmission standby timer 15 in which a predetermined time is individually set, and the transmitting circuit 13 and A reply signal (data) 41 is transmitted via the transmitting antenna 11. The data transmitted from the responder is transmitted by the reception antenna 31 of the interrogator 3, demodulated by the reception circuit 33, and corresponds to each of the responders 1-1 to 1-N as shown in FIG. It is sequentially stored in the storage area on the RAM 36 provided by the above. Only the data of the transponder designated by the host computer 2 is RA
It can be taken out from the corresponding area in M36 and transmitted to the host computer 2 via the microcomputer 34.

FIG. 2 (A) is a flow chart showing an example of a processing procedure by the interrogator 3 shown in FIG. 1, and FIG. 2 (B) is also a responder 1-1 to 1-
FIG. 3 is a flowchart showing an example of the processing procedure by N, FIG. 3 is a timing chart showing the operation timing of the interrogator and the responder, and FIG. 4 is a diagram showing a data storage mode in the RAM 36 in the interrogator 3. The operation of this embodiment will be described with reference to FIG.

First, in step SA1 of FIG. 2 (A), the interrogator 3 is all responders.
When a data output request command is sent to 1-1 to 1-N, each responder receives the command in step SB1 of FIG.
In step SB3, the transmission standby timer 15 is activated. Then, after the time set in the timer 15 of its own has elapsed (step SB5), data is output to the interrogator 3 in step SB7.

That is, as shown in FIG. 3, if the timers 15 of the transponders 1-1 to 1-N are set to T1-1 to T1-N times, respectively,
After the set time has elapsed since the instruction A was received (for example, the responder 1-1
Then, after T1-1 time has elapsed), data outputs B to E will be made. Therefore, the output data B to E are sequentially received by the interrogator 3, and the interrogator 3 stores these data in the corresponding area of the RAM 36 in the order of reception in step SA3 (see FIG. 4).

As described above, the reply signal from the responder is time-divided by the timer, so that interference of reply signal transmission can be avoided and one-to-one transmission / reception can be performed with all responders.

In the above configuration, if all the data from all the responders are stored in the RAM 36, the RAM 36 also has a large capacity as the number of responders increases. Therefore, in this embodiment, as shown in FIG. 1, a timer detection circuit 35 is provided on the interrogator 3 side, and a time corresponding to a designated responder (for example, T1 if the designated responder is responder 1-3). -Receive and store only the data immediately after the elapse of (a time corresponding to -3) to improve the RAM usage efficiency. This makes RAM3
A small capacity 6 can be used.

[Effect of device]

As described above, according to the present invention, the responder is provided with the timer, and the responder responds to the interrogation signal from the interrogator in a time-divisional manner by the timers set individually beforehand. It is possible to make one-to-one communication between the interrogator and the responder with a simple configuration without being unable to communicate due to the transmission interference of the interrogator. Also, since the interrogator is provided with the timer detection means, it is built in the interrogator. It is possible to obtain the effect that the storage device for storing the data from the transponder may have a small storage capacity for storing the data of the transponder which has made a data output request instructed by the host computer.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of the configuration of the data transmission / reception system of the present invention, FIGS. 2 (A) and 2 (B) are flowcharts showing an example of the operation procedure of the configuration shown in FIG. 1, and FIG. 3 is an interrogator and Timing chart for explaining the operation of the transponder, Fig. 4 shows RA in which the interrogator stores the transmission data from the transponder
It is explanatory drawing which shows the structural example of M area | region. 1-1 to 1-N …… Responder, 2 …… Host computer, 3 …… Interrogator, 10,11,30,31 …… Antenna, 12,33 …… Reception circuit, 13,32 …… Transmission circuit , 14,34 ... Microcomputer, 15 ... Transmission standby timer, 36 ... RAM.

Claims (1)

[Scope of utility model registration request] 1. A data transmission / reception system for mutually transmitting and receiving data by an electromagnetic wave between an interrogator connected to a host computer and a plurality of responders, comprising: a data output request command instructed by the host computer. In a data transmission / reception system in which the plurality of responders output data in response to an interrogation signal from the interrogator, the plurality of responders include a timer and the data after a time counted by the timer from the reception of the interrogation signal. A data transmission / reception system, characterized in that the interrogator has a timer detection means for receiving only data from a responder designated by a data output request command from the host computer. .