JP3092503B2 - Wireless data collection device - Google Patents

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 apparatus for collecting data of a device using wireless, and more particularly to a wireless data collecting apparatus capable of easily connecting different types of sensor circuits to a transponder. .

[0002]

2. Description of the Related Art A conventional wireless data collecting apparatus is disclosed in, for example, Japanese Patent Application No. 7-12121 filed by the present applicant.
6 "and the like. In Japanese Patent Application No. 7-121616, data of various sensor circuits connected to the transponder can be read from the interrogator by wireless.

[0003]

However, in order to connect various sensor circuits to the transponder, an interface circuit suitable for each sensor circuit is required, and a sensor which does not conform to the interface circuit provided in the transponder is required. There is a problem that the circuit cannot be connected.

For example, a pressure sensor circuit cannot be connected to a transponder provided with an interface circuit for a temperature sensor circuit, and if the pressure sensor circuit is to be connected, the transponder itself or the internal interface circuit must be replaced. There is a problem that I must say. Therefore, an object of the present invention is to realize a wireless data collection device capable of easily connecting different types of sensor circuits to a transponder.

[0005]

In order to achieve the above object, according to a first aspect of the present invention, an interrogator and a response which modulates an interrogation wave from the interrogator based on data and reflects it as a response wave. In the wireless data collection device consisting of a device, the interrogator, the antenna for transmitting and receiving the response wave and the interrogation wave, and detects the interrogation wave, interprets the content of the transmitted data and Detection means for performing processing in accordance with the contents of data; interface circuit selection means for storing an identification code transmitted from the interrogator and selecting one from a plurality of interface circuits based on the identification code; A transponder comprising modulation means for modulating the interrogation wave based on data input via the selection means. .

In a second aspect of the present invention, in the first aspect of the present invention, the transponder stores operation constants of various sensor circuits in the transponder,
The arithmetic constant is transmitted to the interrogator together with the measurement data.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration block diagram showing one embodiment of a wireless data collection device according to the present invention.

In FIG. 1, 1 is a transmitting circuit, 2, 3 and 6
Is an antenna, 4 is a demodulation circuit, 5 is a display circuit, 7 is a detection circuit, 8 is a signal detection circuit, 9 is an A / D converter, 10 is a modulation circuit, 11 and 13 are switching circuits, 12a, 12b and 1
2c is an interface circuit, 14 is a sensor circuit, 15
Is an identification code storage circuit.

Here, 1 to 5 indicate the interrogator 50 and 6 to 13
And 15 are transponders 51, 7 and 8 are detectors 52,
9 and 10 constitute the modulating means 53, and 11 to 13 and 15 constitute the interface circuit selecting means 54, respectively.

The output of the transmitting circuit 1 is connected to the antenna 2, the output of the antenna 3 is connected to the demodulation circuit 4, and the output of the demodulation circuit 4 is connected to the display circuit 5.

The output of the antenna 6 is connected to a detection circuit 7, and the output of the detection circuit 7 is connected to a signal detection circuit 8.
The output of the signal detection circuit 8 is stored in the identification code storage circuit 15.
And a start signal from the signal detection circuit 8 is connected to a control terminal of the A / D converter 9.

On the other hand, the output of the sensor circuit 14 is
3, the first, second and third output terminals of the switching circuit 13 are connected to the interface circuits 12a and 12a.
b and 12c.

The outputs of the interface circuits 12a, 12b and 12c are respectively connected to first, second and third input terminals of the switching circuit 11, and the output terminal of the switching circuit 11 is connected to the A / D converter 9. .

The output of the A / D converter 9 is connected to the modulation circuit 10, and the output of the modulation circuit 10 is connected to the antenna 6. The output of the identification code storage circuit 15 is connected to the control terminals of the switching circuits 11 and 13 as a control signal.

The operation of the embodiment shown in FIG. 1 will now be described. The interrogator 50 performs an initial setting at the time of the first access after the sensor circuit 14 is attached to the transponder 51.

First, in the interrogator 50, the transmitting circuit 1 generates an interrogation wave based on the identification code corresponding to the sensor circuit 14 attached to the transponder 51 and radiates it from the antenna 2 toward the transponder 51. .

The transponder 51 is activated by receiving the interrogation wave by the antenna 6, and is detected by the detection circuit 7. The signal detection circuit 8 detects the identification code based on the output of the detection circuit 7 and stores it in the identification code storage circuit 15.

The switching circuits 11 and 13 select an interface circuit based on the output of the identification code storage circuit 15, and the initialization is completed.

For example, the interface circuits 12a, 1
2b and 12c are for a pressure sensor circuit, a flow sensor circuit, and a temperature sensor circuit, respectively.
When the temperature sensor circuit is connected, the interrogator 50 transmits an identification code for selecting the interface 12c to the responder 51.

In the normal operation state, the transmission circuit 1 in the interrogator 50 performs ASK (Amplitude Shid) based on the transmission data.
ft Keying) modulated and transmitted from the antenna 2 as a query wave.

When a series of data transmission is completed, the interrogator 50
Enters the data reception state. In the data receiving state, the transmission circuit 1 transmits the carrier as it is from the antenna 2 as an unmodulated interrogation wave.

The transponder 51 receives the ASK-modulated interrogation wave transmitted from the interrogator 50 by the antenna 6, detects it by the detection circuit 7, and outputs it to the signal detection circuit 8. The signal detection circuit 8 interprets the contents of the data transmitted from the interrogator 50 and performs a process according to the contents of the data.

For example, when the content of the data is a command for reading data from the externally connected sensor circuit 14, the signal detection circuit 8 activates the A / D converter 9 with the activation signal.

The A / D converter 9 converts the output of the sensor circuit 14 input via the switching circuit 13, the interface circuit 12c and the switching circuit 11 into a digital signal and outputs the digital signal to the modulation circuit 10.

The modulation circuit 10 converts the unmodulated interrogation wave transmitted from the interrogator 50 based on the output of the A / D converter 9 into B
PSK (binary phase shift keying) modulation is applied and reflected as a response wave to the interrogator 50.

The interrogator 50 receives the BPSK-modulated response wave reflected from the transponder 51 by the antenna 3 and inputs it to the demodulation circuit 4. The demodulation circuit 4 demodulates the BPSK-modulated response wave and outputs it to the display circuit 5. The display circuit 5 displays input data and the like.

As a result, the identification code is transmitted to the transponder 51 in the initial setting, and an interface circuit suitable for the sensor circuit 14 attached to the transponder 51 is selected. It is possible to connect to

When the type of the sensor circuit 14 is changed for some reason after the transponder 51 is installed, the sensor circuit 1
It is possible to easily cope with the type change by performing the above-mentioned initial setting again after the type change of 4 and rewriting the identification code.

Further, calculation constants such as calibration data and correction data corresponding to various sensor circuits are stored in the transponder 51, and the calculation constants are stored in the interrogator 50 together with the measurement data.
, It is not necessary for the interrogator 50 to store the calculation constants of various sensor circuits, thereby simplifying the circuit configuration.

Instead of transmitting the calculation constant together with the measurement data to the interrogator 50, the transponder 51 performs a calibration calculation or the like based on the calculation constant, and transmits the calculation result to the interrogator 50. May be.

In the embodiment shown in FIG.
, A plurality of connectors may be provided at the input terminals of the interface circuits 12a to 12c.

In the embodiment shown in FIG. 1, the output of the sensor circuit 14 is converted into a digital signal using the A / D converter 9, but the modulation circuit 10 is directly controlled by the output of the sensor circuit 14. Alternatively, a digital signal may be directly output from the sensor circuit 14.

[0033]

As is apparent from the above description,
According to the present invention, the following effects can be obtained. According to the invention of claim 1, by transmitting an identification code suitable for the attached sensor circuit to the transponder and selecting an interface circuit suitable for the sensor circuit from a plurality of interface circuits provided in the transponder, A wireless data collection device capable of easily connecting different types of sensor circuits to the transponder can be realized.

According to the invention of claim 2, arithmetic constants such as calibration data and correction data corresponding to various sensor circuits are stored in the transponder, and the arithmetic constants are transmitted to the interrogator together with the measurement data. By doing so, it is not necessary for the interrogator to store arithmetic constants for various sensor circuits, so that the circuit configuration is simplified.

[Brief description of the drawings]

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

[Explanation of symbols]

 Reference Signs List 1 transmission circuit 2, 3, 6 antenna 4 demodulation circuit 5 display circuit 7 detection circuit 8 signal detection circuit 9 A / D converter 10 modulation circuit 11, 13 switching circuit 12a, 12b, 12c interface circuit 14 sensor circuit 15 identification code storage Circuit 50 Interrogator 51 Transponder 52 Detection means 53 Modulation means 54 Interface circuit selection means

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-7-321697 (JP, A) JP-A-5-197728 (JP, A) JP-A-5-66270 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) G01S ^7/ 00-7/42 G01S 13/00-13/96

Claims (2)

(57) [Claims] 1. A wireless data collection apparatus comprising: an interrogator; and a transponder which modulates an interrogation wave from the interrogator based on data and reflects the interrogator as a response wave, wherein the interrogator; An antenna that transmits and receives the interrogation wave, a detection unit that detects the interrogation wave, interprets the content of the transmitted data, and performs a process according to the content of the data, and an antenna that is transmitted from the interrogator. Interface circuit selecting means for storing an identification code and selecting one from a plurality of interface circuits based on the identification code, and modulating means for modulating an interrogation wave based on data input through the interface circuit selecting means. A wireless data collection device, comprising: 2. The wireless data according to claim 1, wherein the transponder stores operation constants of various sensor circuits, and transmits the operation constants together with measurement data to the interrogator. Collection device.