JPH0937359A - Radio data collecting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of pieces of data to be transmitted by applying necessary arithmetic processing to output data from plural sensor circuits based upon a command transmitted from an interrogator to a responder. SOLUTION: This radio data collecting system consists of an interrogator 50 and a responder 51 for receiving an interrogation wave from the interrogator 50, collecting data by the interrogation wave command, modulating 8 the non- modulated interrogation wave received from the interrogator 50 based on the data, and reflecting the modulated wave as a response wave. The system is provided with an arithmetic circuit 7 for applying arithmetic processing to plural data inputted to the responder 51 by the command from the interrogator 50 at need. A response wave is generated based upon an output from the circuit 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless data collecting system which collects data from a responder or the like by using wireless, and particularly performs arithmetic processing such as temperature compensation based on output data of a plurality of sensor circuits. The present invention relates to a wireless data collection system that can communicate later.

[0002]

2. Description of the Related Art A conventional wireless data collection system is composed of an interrogator carried by a data collector and a transponder installed with facilities and the like. The data collector transmits the interrogation wave from the interrogator to the transponder near the transponder to perform communication.

Specifically, when the interrogator sends a command to the responder, for example, the command is ASK (Amplitude s).
(Hift keying) Modulation is transmitted by modulation, and when reading data from the transponder, an unmodulated interrogation wave is transmitted and the reflected wave from the transponder is received and demodulated to be stored in the transponder. Get data etc.

On the other hand, the transponder receives the transmitted command, interprets the command for data collection, data transmission, etc., and performs necessary processing. Further, at the time of data transmission, the non-modulated interrogation wave transmitted from the interrogator is modulated by BPSK (Binary phase shift keying) modulation or the like and reflected.

For example, when a pressure sensor whose sensitivity changes due to temperature fluctuation is used as the sensor circuit, the responder sends pressure data and temperature data to the interrogator, and the interrogator or the host controller determines the pressure data to be temperature. Processing such as temperature compensation is performed using the data.

When the temperature sensor is not connected to the transponder, the interrogator itself measures the temperature, or the host controller directly measures the temperature to perform temperature compensation or the like based on the temperature data obtained. Was there.

[0007]

However, in the latter case, it is necessary to mount a plurality of sensors such as temperature sensors required for various compensations on the interrogator itself, which complicates the circuit configuration. Moreover, when transmitting a plurality of data such as pressure data and temperature data to the interrogator as in the former case, the amount of data to be transmitted becomes large, the transmission time becomes long and the probability of a communication error increases. There is a problem that I said. Therefore, an object of the present invention is to realize a wireless data collection system capable of reducing the number of data to be transmitted.

[0008]

In order to achieve such an object, the present invention receives an interrogator, an interrogation wave from the interrogator, collects data according to an instruction of the interrogation wave, and In a wireless data acquisition system comprising a transponder that modulates an unmodulated interrogation wave from an interrogator based on the data and reflects it as a response wave, the data is taken into the transponder by a command from the interrogator. Equipped with an arithmetic circuit that performs arithmetic processing on multiple data as necessary,
The response wave is generated based on the output of the arithmetic circuit.

[0009]

The number of data to be transmitted is reduced by providing an arithmetic circuit in the transponder for performing necessary arithmetic processing on output data of a plurality of sensor circuits based on a command transmitted from the interrogator.

[0010]

The present invention will be described in detail below with reference to the drawings.
FIG. 1 is a configuration block diagram showing an embodiment of a wireless data collection system according to the present invention. In FIG. 1, 1 is a signal processing circuit, 2 is a display device, 3 and 4 are antennas, 5 is a wave detector, 6 is a control circuit, 7 is an arithmetic circuit, 8 is a modulation circuit, and 9a.
And 9b are sensor circuits.

Here, 1 to 3 are interrogators 50 and 4 are interrogators.
8 constitute the transponder 51, respectively.

In the interrogator 50, the signal processing circuit 1 is provided with the display device 2, and the input / output of the signal processing circuit 1 is connected to the antenna 3.

On the other hand, in the responder 51, the input / output of the antenna 4 is connected to the input terminal of the detector 5 and the output terminal of the modulation circuit 8, and the output of the detector 5 is connected to the control circuit 6.

The output of the control circuit 6 is the sensor circuits 9a and 9a.
b, the outputs of the sensor circuits 9a and 9b are connected to the arithmetic circuit 7, and the output of the arithmetic circuit 7 is connected to the modulation circuit 8.

The operation of the embodiment shown in FIG. 1 will be described. First, the interrogator 50 modulates a command or the like by the ASK modulation or the like to the responder 51 and transmits the command and the like.

The transponder 51 receives this modulated signal at the antenna 4, demodulates it at the wave detector 5, and outputs it to the control circuit 6. The control circuit 6 extracts a command from the signal input from the detector 5, interprets the content of the command, and performs necessary processing.

For example, consider a case where the sensor circuit 9a is a pressure sensor, the sensor circuit 9b is a temperature sensor, and temperature compensation is required for the output data of the sensor circuit 9a.

Here, when the command from the interrogator 50 is a request to read the temperature-compensated pressure data, the control circuit 6 sends a control signal to the control terminals of the sensor circuits 9a and 9b to send them to the sensor circuits 9a and 9b. To the operating state.

The output data of the sensor circuits 9a and 9b are input to the arithmetic circuit 7, and the arithmetic circuit 7 compensates the output data of the sensor circuit 9a with the output data of the sensor circuit 9b and outputs it to the modulation circuit 8.

The modulation circuit 8 modulates the unmodulated interrogation wave from the interrogator 50 by BPSK modulation or the like based on the output of the arithmetic circuit 7 and reflects it to the interrogator 50.

As a result, the responder 51 performs necessary arithmetic processing on the output data of the plurality of sensor circuits based on the command transmitted from the interrogator 50 and then transmits only the arithmetic result to the interrogator 50. It becomes possible to reduce the number of data to be transmitted.

Although the arithmetic circuit 6 performs arithmetic processing on a plurality of data in the above description, the arithmetic circuit 6 may not be operated unless the arithmetic processing is required.

That is, for example, when the command from the interrogator 50 is a read request for raw pressure data that has not been temperature compensated, the control circuit 6 sends a control signal only to the control terminal of the sensor circuit 9a. 9a is put into operation.

The output data of the sensor circuit 9a is the arithmetic circuit 7
Is input to the modulation circuit 8 without performing any calculation processing on the output data of the sensor circuit 9a.

The modulation circuit 8 modulates the non-modulated interrogation wave from the interrogator 50 by BPSK modulation or the like based on the output of the arithmetic circuit 7 and reflects it to the interrogator 50.

Further, for example, when the command from the interrogator 50 is a request to read temperature data for compensation, the control circuit 6 sends a control signal only to the control terminal of the sensor circuit 9b to activate the sensor circuit 9b. Then, the same processing as described above is performed.

As a result, the responder 51 does not perform temperature compensation by transmitting the output data of the plurality of sensor circuits to the interrogator 50 without performing arithmetic processing based on the command transmitted from the interrogator 50. Desired data such as raw pressure data and temperature data for compensation can be arbitrarily read.

The communication system between the interrogator and the responder is not limited to the one using electromagnetic waves as in the embodiment shown in FIG. 1, but may be communication using light such as infrared rays. Further, although the interrogator 50 is provided with the display device 2, the display device 2 may be omitted.

Further, the arithmetic expression set in the arithmetic circuit 7 may be programmable from the outside.

Further, although the sensor circuits 9a and 9b are pressure sensors, temperature sensors and the like, they are not limited to them, and the sensor circuits may be installed inside the responder 51 or the like.

[0031]

As is apparent from the above description,
The present invention has the following effects. Wireless data collection that can reduce the number of data to be transmitted by providing an arithmetic circuit in the transponder that performs necessary arithmetic processing on the output data of multiple sensor circuits based on the command transmitted from the interrogator The system can be realized.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of a wireless data collection system according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 signal processing circuit 2 indicator 3,4 antenna 5 detector 6 control circuit 7 arithmetic circuit 8 modulation circuit 9a, 9b sensor circuit 50 interrogator 51 responder

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoshi Takai 2-9-32 Nakamachi, Musashino-shi, Tokyo Yokogawa Electric Co., Ltd.

Claims (1)

[Claims] 1. An interrogator and an interrogation wave from this interrogator are received, data is collected by an instruction of this interrogation wave, and an unmodulated interrogation wave from the interrogator is modulated based on the data and responded. A wireless data collection system including a transponder that reflects waves, including an arithmetic circuit that performs arithmetic processing on a plurality of data captured in the transponder in response to a command from the interrogator as necessary. A wireless data acquisition system, wherein the response wave is generated based on the output of the arithmetic circuit.