JPS60138700A - Telemetry system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a remote measurement system having a function of converting the scale of a digital output using the contents of received data or a decoder output signal as a variable.

[Technical background of the invention and its problems]

Conventionally, in the remote needle 11111 system, an analog device such as a meter with a pointer display has been used as a display device for displaying the measured amount, but recently, a deisotal display device such as an indicator has been increasingly used.

FIG. 1 shows a block diagram of a conventional analog output remote measurement system.

In the figure, 1 is the A/L that digitizes the analog signal.
) The A/D converter 1 converts the measurement input into a digital signal corresponding to the signal level, and the converted digital signal is supplied to the encoder 2 to be encoded and transmitted to the transmitter. 3 to the monitoring side via the transmission line 4.

On the monitoring side, a receiving device 5 receives data transmitted via a transmission path 4, a decoding device 2 decodes the received data, and then a converter is used to convert the digital signal into an analog signal. 7 also performs scale conversion and converts the data into analog data and displays the data on an external analog device. Oh,
Transmission is relative value transmission.

By the way, the following two methods are adopted to change the analog display device of the conventional analog output remote measurement system to a digital display device and create a digital display type system.

One is the /A-+ψ conversion system as shown in FIG. This is an A/I) converter 8 after the D/A converter 7.
The final analog output to be sent to an analog display device is φ-converted and digitized as it is, and then fed to a digital display device for digital display.

This method involves repeating D/A conversion and A/D conversion, and the quantization error when converting an analog quantity to a dinotal quantity corresponds to the dizotal value of the minimum resolution when digitizing. Since it is not possible to express the analog quantity under the processing conditions, when the original analog quantity is digitized, there will be an error in a range smaller than the minimum resolution mentioned above, and the D/A
The disadvantage is that the conversion error of each converter is included during conversion and ψ conversion, resulting in lower accuracy.

Another method is an absolute value transmission method as shown in FIG.

In this method, the measurement input is given to the scale converter 9 for scale conversion, then ψ converted by the φ converter 1, encoded, and transmitted to the transmitter 3, and the data is transmitted as an absolute value. It is transmitted to the monitoring side via the transmission path 4, and on the monitoring side, it is received by the receiving device 5 and decoded by the decoding device 6.
The disadvantage of this method is that the scale converter 9 is provided on the transmitting side, so the number of scales on the monitored side is equal to the number of measurement inputs. A conversion function must be provided.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and is a remote measurement system that can handle multiple types of measurement inputs with a single scale conversion function without reducing accuracy. The purpose is to provide

[Summary of the invention]

That is, in order to achieve the above object, the present invention provides a remote measurement system that converts various analog needle side signals into digital data, sends it to the server/monitoring side by relative value transmission, scales it, and displays it digitally. On the side, there is a means for calculating a multiplication factor necessary for scale conversion according to the type of data sent, and a means for multiplying the data of the measurement signal sent by this multiplication factor to correspond to the original measurement signal. and a means for converting the data into data sent by relative value transmission, and calculate a multiplication factor for scale conversion according to the type of data sent by relative value transmission, and correct the data by multiplying the multiplication factor thus obtained. This eliminates the need for scale conversion on the transmitting side, and also eliminates the need for D/A on the receiving side.
, A/1) Conversion is uneasy.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

Figure 4 is a block diagram of this device, and the measurement input is A/D.
The process from input to the converter 1 to decoding by the decoding device 6 on the monitoring side is the same as the analog output remote measurement system shown in FIG.

In the present invention, when sending analog measurement input to the monitoring side as shibisotal data by relative value transmission, if a number corresponding to the measurement input (or information indicating what measurement input is handled, etc.) is received, it is handled accordingly. The scale is configured by adding a data processing device 10 that calculates a preset multiplication factor, and a scale conversion device 11 that corrects and outputs the output of the decoding device 6 using the calculated multiplication factor. By performing the conversion by varying the multiplication factor according to the measurement input, it is possible to deal with any measurement input.

The multiplication factor calculation is performed, for example, by adding information such as the above-mentioned number, which serves as a clue for calculating the length multiplication factor, to the transmitted data, separating it in the decoding device 6, and providing it to the data processing device 10. The optimum method should be obtained depending on the configuration and the content of the output signal of the decoding device 6.

In such a configuration, when transmitting the measurement input, information such as a number corresponding to the type of measurement input is added and sent from the transmitting device 3 to the transmission path 4, and the monitoring side receives this. The data is received by the device 5 and decoded by the decoding device 6.

When the data processing device 1o receives information corresponding to the type of measurement input from among the decoded signals, the data processing device 1o converts this information into preset types of measurement input. The determined multiplication factor is determined and the obtained multiplication factor is given to the scale conversion device 1.

Then, the scale conversion device 11 converts the measurement input data that is output from the decoding device 6.

The data is corrected by multiplying by the above multiplication factor and output. This output is then displayed on a digital display.

It is possible to change the scale of any type of measurement input data sent by relative value transmission to a scale value corresponding to the original measurement value, making it possible to display accurately.

In addition, in this device, after the A/D converter 1 is installed on the transmitting side and the analog measurement input is digitized, no D/A conversion or conversion is performed. This enables highly accurate remote monitoring.

Further, unlike the absolute value transmission method shown in FIG. 3, there is no need to provide the scale conversion device 9 on the monitored side, that is, on the transmitting side, so modification is easy.

□The present invention is not limited to the embodiments described above and shown in the drawings, but can be practiced with appropriate modifications within the scope of the gist thereof.

〔Effect of the invention〕

As described in detail above, the present invention provides a remote measurement system that converts various analog measurement signals into digital data, sends it to the monitoring side by relative value transmission, scales it, and displays it digitally. means for calculating the number of rides required for scale conversion according to the type of data received; and means for multiplying the number of rides by the data of the received measurement signal to convert it into data corresponding to the original measurement signal. In addition to setting up a board for scale conversion according to the type of data sent by relative value transmission, the board is multiplied by the data to correct it. D
/A, A//L) conversion is not necessary, therefore, it is possible to eliminate the decrease in accuracy caused by the conversion, and
dllJ (Since it is corrected according to the type of No. 0, it is possible to scale the original measurement signal by 16 degrees. Therefore, if it is accurate, it is possible to display the measurement value, and the scale conversion on the receiving side can be done by changing the multiplication factor. It is possible to provide a remote measurement system having features such as ii) [Since it is performed according to the type of image signal, only one scale conversion means is required.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the configuration of a conventional analog output remote iI side system, Figure 2 is a block diagram of a D/A-A/D conversion system, and Figure 3 is a block diagram of a conventional absolute value transmission system. Block Diagram FIG. 4 is a block diagram showing one embodiment of the present invention. 1.8...A/l) i converter, 2... encoding device,
3... Transmitting device, 4... Transmission path, 5... Receiving device, 6... Decoding device, 7... D/A converter, 9...
・School conversion device, 10...data processing device, 11
...Scale converter.

Claims (1)

[Claims] In a remote measurement system that digitally converts various analog measurement signals to be transmitted, transmits them through relative value transmission, and receives the signals to obtain and display received data, scale conversion is performed depending on the type of received data. A remote measurement system comprising means for calculating a necessary multiplication factor, and means for multiplying the received data by the obtained multiplication factor and converting the received data into digital data corresponding to the original measurement signal.