JPH01253344A - Signal communication circuit device - Google Patents

Abstract

PURPOSE:To facilitate the transfer of signals between the devices of different protocols by setting a signal converting circuit between an environment test device and a controller to perform the mutual exchange between a branch parallel transmission signal and a serial transmission signal. CONSTITUTION:An environment test device 1 transmits an IEEE-488 signal of a branch parallel communication system onto a cable 111 via a control part 10. A computer 2 puts a RS-232C signal of a serial transmission system onto a cable 210 via a control part 21. These two signals are converted into each other by a signal converting circuit 3 and transmitted to each corresponding device. Then a computer 1 transmits setting signals for start, temperature and humidity, and the operating time setting signal, etc., of the device 1 to the circuit 3 by an IEC RS-232C signal via the cable 210. Thus the circuit 3 converts a data signal DTp into a parallel data signal DTs and also converts a control signal CSp into a control signal CSs based on a prescribed protocol. These signals are transferred to the device 1 via a cable 100.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control signal communication line device, and particularly to a control signal communication line device suitable for data communication ε of a measurement system such as an automatic environmental test system.

[Conventional technology]

In general, an automatic environmental test system includes a plurality of environmental test devices that perform environmental tests such as constant temperature constant temperature on the test object, and transfers the temperature signals etc. by branch parallel transfer communication, and the environmental test devices and control signals and It is equipped with a computer that sends and receives temperature signals, etc., and a plurality of signal conversion circuits that connect these environmental test devices and computers by branch parallel communication, and the computer controls the plurality of environmental test devices in a predetermined manner by branch parallel communication such as control signals. It is configured to maintain the temperature at

The branch parallel communication system is used for a total transmission distance of about 20 m when all the digital signal transmission devices are connected. In addition, the above-mentioned computers are limited to those with special functions that have the function of branching and parallel communication of control signals, etc., and it is not possible to use a normal computer with a communication circuit of a two-point serial transmission method with a different protocol. It was something.

Note that the signal communication using the branch parallel transmission method is, for example,
It is known as the If!EB 488 interface bus, and the point-to-point serial transmission system signal communication is known as the Electronic Industries Association (EIA) standard R5-232C interface.

[Problem to be solved by the invention]

In the automatic environmental test system according to the prior art, the communication method is limited to branch parallel communication of the environmental test equipment, so it is not possible to use a normal computer with a communication circuit of a two-point serial transmission method with different protocols. This was a major constraint on the system configuration. Furthermore, since a plurality of signal conversion circuits compatible with the environmental test equipment are required, it is economically burdensome. Further, the conventional apparatus has a problem in that it is not possible to communicate with an environmental test apparatus located far from the computer equipment because the maximum distance between adjacent apparatuses is limited.

An object of the present invention is to eliminate the problems of the prior art, and to provide a signal communication line device that is highly versatile and suitable for an environmental test system capable of long-distance transmission.

[Means to solve the problem]

In order to achieve the above object, the present invention includes at least one environmental test device that transmits and receives signals in a parallel transmission method consisting of data signals and control signals, and transmits and receives signals in a serial transmission method consisting of data signals and control signals. In a signal communication line device that transfers signals to and from a control device, for example, a computer, the data signal of the parallel transmission method is parallel-to-serial converted to the data signal of the serial transmission method, and the data signal of the serial transmission method is placed. a data serial/parallel converter that converts the parallel transmission method into a data signal of a parallel transmission method; A signal conversion circuit is provided, which includes a control signal conversion section that converts the data into a control signal of a parallel transmission system by using the protocol, and a control section that controls the operations of the data serial/parallel conversion section and the control signal conversion section.

Furthermore, the present invention includes a modulation/demodulation circuit between the control device and the signal conversion circuit, which modulates the serial transmission system signal into a public communication line signal and demodulates the public communication line signal into a serial transmission system signal. Two units were installed, and the modulation/demodulation circuits of the two units were connected via a public communication line.

[Effect]

In the signal conversion circuit, the data serial/parallel converter performs parallel/serial/serial/parallel conversion of the data signal according to instructions from the control unit, and the control signal converter converts the control signal according to a predetermined protocol, thereby converting the data signal into parallel transmission mode. Transmits signals between the environmental test equipment and the serial transmission type control equipment.

Therefore, the signal communication line device according to the present invention can transmit and receive signals between the environmental testing device and the control device using different communication protocols.

Further, by providing two modulation/demodulation circuits between the control device and the signal conversion circuit and connecting them through a public communication line, the environmental test device and the control device can be placed in isolation.

[Embodiment] Hereinafter, one embodiment of the signal communication line device according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing an environmental test system including a signal communication line device according to an embodiment of the present invention, and FIG.
3 is a diagram showing the signal conversion circuit shown in FIG. 3, and FIG. 3 is a diagram for explaining a signal communication line device according to another embodiment of the present invention.

First, the automatic environmental test system shown in FIG. a test device 1; a signal conversion circuit 3 connected to the test device AI control unit 10 via a cable 100;
It consists of the conversion circuit 3 and a computer 2 connected to a control section 21 via a cable 210. In this embodiment, the signal conversion circuit 3 and cable 210.100 constitute a signal communication line device.

The environmental test device I is a branch parallel communication system IEEE-
The computer 2 transmits the R5-232C signal of the serial transmission system onto the cable 210 by the control unit 21, and these signals are transmitted to the signal conversion circuit 3. are converted into each other and sent to the corresponding device. In addition, the contents of these signals may be transferred from the host computer 2, for example, when the environment test equipment starts up/
These are stop, temperature, humidity setting signals, operation time setting signals, etc., and the signals sent from the environmental test device 1 include actual measured values of temperature, humidity, abnormality alarm signals, etc.

Next, details of the signal conversion circuit 3 will be explained using FIG. 2. First, IECR5 transmitted and received from computer 1
The data signal DTp, which is a -232C signal, is a serial transmission signal that is transferred in time series, and is transmitted from the environmental test equipment 1, etc. If! T! Data signal D, which is an E-488 signal
Since Ts is a parallel transmission signal that is transmitted in parallel in bit time, the signal conversion circuit 3 has a temporally and spatially different arrangement from the data serial/parallel converter 31 that performs parallel/serial conversion on these signals. IBCR5-232C signal and IEEEH-4
A control signal converter 32 that converts each of the 88 control B signals C3p and CSs according to these protocols, and a controller 33 that controls these data serial/parallel converter 31 and control signal converter 32 using timing signals or the like. The serial data signal DT transmitted from the computer l
The data converter 31 converts p into a parallel data signal DTs, and the control signal converter 32 converts the control signal C3p into a control signal CSs and transfers it to the environmental testing device 1 side, and also performs the reverse conversion. It is something.

Now, in the automatic environmental test system configured in this way, the computer 1 first sends signals such as startup of the environmental test equipment, temperature and humidity setting signals, and operation time setting signals to the llECR3-23.
When the 2C signal is transmitted to the signal conversion circuit 3 via the cable 210, the conversion circuit 3 converts the data signal DTp, which is a serial signal, into a data signal DTs, which is a parallel signal, and converts the control signal C3p into a predetermined protocol. and convert these signals into control signals C5s according to the cable 1
00 to the environmental testing device 1 side. On the environmental testing equipment side, the designated environmental testing equipment via the cable 111 starts operating in accordance with the startup, temperature, etc. setting signals. Each environmental test device transfers the test state, such as temperature, from the control unit 10 to the signal conversion circuit 3 via the cables 111 and 100, and the conversion circuit 3 transfers the parallel data signal DTs, contrary to the above. Data signal o which is a serial signal
'rp and juxtapose the control signal CSs to the control signal CSp
and send it to computer 2.

In this way, the system according to this embodiment has the signal conversion circuit 3
The signal transmission method on the test equipment side and the computer side,
That is, even if the protocols are different, signals can be transferred between devices, and the system can be easily configured using an ordinary computer. Furthermore, it is economical because it does not require multiple signal conversion circuits. Furthermore, since IECR5-232C signals are used between the signal conversion circuit 3 and the computer 2, the length of the cable therebetween can be increased. Furthermore, since only one signal conversion circuit is required, the system can be constructed economically.

Next, another embodiment of the present invention will be described with reference to FIG. The difference between the environmental test system shown in FIG. 3 and the embodiment described above is that modulators 41 and 40 are provided between the signal conversion circuit 3 on the environmental test device 1 side and the computer 2; 40 through the public communication line 5, and in this embodiment, the cable 100
．． Signal conversion circuit 3. The modulators 41 and 40. Public communication circuit 5. Cable 210 constitutes a signal communication line device.

The modulators 40 and 41 convert the data signal DTP and control signal C3p, which are IBCR3-232C signals, into several tens of
It modulates and demodulates a sine wave signal of 0 to 1000 Hz, and these modulators 41 and 40 are connected via a public communication line 5 for sine wave signals.

A system configured in this way is, for example, a computer 2.
The data signal o'rp is a serial transmission signal output from
and the control signal CSp, the modulator 40 converts the control signal CSp into several hundred
The modulated signal is modulated into a sine wave signal of Hertz to 1000 Hertz, transferred to the modem 41 via the public communication line 5, demodulated into the serial transmission signal by the modem 41, and then converted into a parallel transmission signal by the signal conversion circuit 3. The data is then transmitted to each environmental test device 1.

Conversely, the data signal DTs and the control signals C3p and CS, which are parallel transmission signals output from the environmental test device 1,
s is converted to the signal conversion circuit 3° modem 41 by the reverse procedure to the above.
and 40 perform conversion into a serial transmission signal and modulation/demodulation of the sine wave signal, which is then transferred to the computer 2.

As described above, according to this embodiment, since the serial transmission signal is modulated and demodulated into a sine wave signal and the signal is transmitted via the public communication line,
The environmental test equipment side and the computer side can be placed separately, providing flexibility in system construction.

〔Effect of the invention〕

As described above, according to the present invention, by providing a signal conversion circuit for mutually exchanging branch parallel transmission signals and serial transmission signals between the environmental test equipment and the control equipment, signal transfer is possible even between equipment using different protocols. It can be done easily. Furthermore, since the serial transmission signals between the control device and the signal conversion circuit are transferred through the public communication line, it is possible to configure a system in which the environmental test device and the control device are isolated.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an environmental test system including a signal communication line device according to an embodiment of the present invention, and FIG.
3 is a diagram showing the signal conversion circuit shown in FIG. 3, and FIG. 3 is a diagram for explaining a signal communication line device according to another embodiment of the present invention. 13.・Environmental test equipment, 2... Computer, 3...
- Signal conversion circuit, 5... Public communication line, 10... Control unit, 2110. Control unit, 31... Data serial/parallel conversion unit, 32... Control signal conversion unit, 33... Control unit, 4
0 and 41...modulation/demodulation section. 100, 111.210...cable. Agent Patent attorney Tadashi Akimoto Actual test results 1 2-1-con C1-ta
Jitsugyosugi 1st road IOgr (t”2/-m+IflT14p
/σ0. //I MA”2/σ・・−θ−
)l Shiko 2 kuzu--Issuka "ff-henshi Gokushi 51--Puze Rika" scolding 1 momme 1 kume 1 Higashi J2--Isseibu Blue is honorable Sword-8sei Kenko 5 fields

Claims (2)

[Claims] (1) Signal transfer between at least one environmental test device that sends and receives signals using a parallel transmission method consisting of data signals and control signals and a control device that sends and receives signals using a serial transmission method consisting of data signals and control signals. In a signal communication line device that performs parallel transmission method data signals, the parallel transmission method data signals are parallel-to-serial converted to convert them into serial transmission method data signals, and the serial transmission method data signals are serial-parallel converted to convert them to parallel transmission method data signals. a data serial/parallel converter that converts the control signal for the parallel transmission method into a control signal for the serial transmission method according to a predetermined protocol, and converts the control signal for the serial transmission method according to a predetermined protocol to generate a control signal for the parallel transmission method. 1. A signal communication line device comprising: a signal conversion circuit comprising a control signal conversion section that converts the data into a data serial/parallel conversion section; and a control section that controls operations of the data serial/parallel conversion section and the control signal conversion section. (2) A public communication line is provided between the control device and the signal conversion circuit, and each of the control device and the signal conversion circuit modulates the signal of the serial transmission system into a signal for the public communication line and also converts the signal for the public communication line. 2. The signal communication line device according to claim 1, further comprising a modulation/demodulation circuit for demodulating signals of a serial transmission system and connecting the control device and the signal conversion circuit to a public communication line.