JPH0546894A - Multiplex transmitter - Google Patents

Abstract

PURPOSE:To attain high-speed transmission by sending only necessary signals among plural analog signals from an A/D converting circuit to a shared signal conductor. CONSTITUTION:A setting switch 4 set the A/D converting circuit to send only the necessary signals among the signals inputted to plural input terminals 1a-1c. Namely, for example, when only the signal inputted to a measuring input terminal 1a is desired to transmit, the setting switch 4 in a transmission unit at the side of data input is set to only the input terminal 1a. Thus, the A/D converting circuit 3 A/D-converts only the signal inputted to the input terminal 1a so as to send it to transmission lines 6a and 6b. Then, a display 8 displays data transmitted by the transmission lines 6a and 6b in a transmission unit 7. Consequently, the delay time of transmission data does not become large, so that it becomes possible to be adapted to a system which is needed high-speed transmission.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex transmission device.

[0002]

2. Description of the Related Art Conventionally, in a multiplex transmission device for transmitting a remote monitoring control signal via a shared signal line, all a plurality of input data have been transmitted.

[0003]

However, in the above-mentioned conventional apparatus, since a plurality of input data are all transmitted, it takes a long transmission time and is not suitable for a system requiring high-speed transmission.

Therefore, an object of the present invention is to provide a multiplex transmission apparatus that solves the above problems.

[0005]

In order to achieve the above object, the present invention focuses on the fact that all the input data is needed infrequently, and transmits only the set input data. That is, the present invention is a multiplex transmission device for transmitting a signal from an input side unit to an output side unit via a shared signal line, wherein the input side unit has an analog input circuit for inputting a plurality of analog signals in parallel, and the analog input circuit. A / D that converts the signal from the input circuit into a digital signal
It is characterized by comprising a conversion circuit and a sending means for sending only a necessary signal of the plurality of analog signals from the A / D conversion circuit to the shared signal line.

[0006]

According to the present invention, only necessary data is transmitted,
High-speed transmission becomes possible.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. 5 is a data input side transmission unit, 7 is a data display side transmission unit having a display 8, and 6a and 6b are both units 5. , 7 are shared signal transmission lines. The data input side transmission unit 5 has three measurement input terminals 1a, 1
b, 1c, an input circuit 2 that amplifies analog signals (remote monitoring control signals) input to these terminals, and analog / digital (A / D) that converts each signal from the input circuit 2 into a digital signal It comprises a conversion circuit 3 and a setting switch 4 for setting data (signals input to the respective input terminals) sent from the A / D conversion circuit 3 to the transmission lines 6a, 6b. Here, when it is desired to transmit only the signal input to the measurement input terminal 1a, the setting switch 4 in the data input side transmission unit 5 is set only to the input terminal 1a. As a result, the A / D conversion circuit 3 A / D converts only the signal input to the input terminal 1a and sends it to the transmission lines 6a and 6b. In the data display side transmission unit 7, the transmission lines 6a, 6
The display 8 displays the data transmitted by b.

FIG. 2 shows a second embodiment of the present invention. The difference from the first embodiment is that the setting switch 4 is built in the data display side transmission unit 7, and The setting content of the switch 4 is read by the control circuit 9 in the data input side transmission unit 5 via the transmission lines 6a and 6b, and A / A is read according to the setting content read by the control circuit 9.
The D conversion circuit 3 is controlled and only the set data is transmitted through the transmission line 6
a, 6b.

A plurality of data display side transmission units 7 are also provided.
When connecting to the transmission lines 6a and 6b, the individual units 7
Set the necessary data in the setting switch 4 respectively,
It is also possible to collectively read these by the control circuit 9 in the data input side transmission unit 5 and set the data to be transmitted.

[0011]

As described above, according to the present invention, it is possible to adapt to a system that requires high-speed transmission without increasing the transmission data delay time as in the prior art.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 is a block diagram of a second embodiment of the present invention.

[Explanation of symbols]

 2 Input circuit 3 A / D conversion circuit 4 Setting switch 6a, 6b Transmission line

Claims (2)

[Claims] 1. A multiplex transmission apparatus for transmitting a signal from an input side unit to an output side unit via a shared signal line, wherein the input side unit has an analog input circuit for inputting a plurality of analog signals in parallel, and the analog input circuit. It has an A / D conversion circuit for converting a signal from the circuit into a digital signal, and a sending means for sending out only a necessary signal of a plurality of analog signals from the A / D conversion circuit to the shared signal line. Characteristic multiplex transmission device. 2. The output unit has means for sending information for setting a signal to be sent to the sending means of the input unit via the shared signal line. The multiplex transmission device according to.