JPH0453327A - Signal transmitter - Google Patents

Abstract

PURPOSE:To check transmission information in duplicate with a simple circuit by adding periodic pulse information to the transmission information and sending the resulting information to a receiver side, detecting the pulse at the receiver side and checking the transmission information. CONSTITUTION:When an operation switch 51 is operated, its output is is inputted to a P/S conversion circuit 57 as the combination information of switches (switch information). The transmission information being the addition of a redundant bit to the switch information is received to apply error check by using the redundant bit and when no error exists, a control output to an equipment to be controlled is obtained and when any error exists, the control output is all interrupted. Moreover, a periodic pulse is added to the switching information and even when no error exists in the transmission information and the periodic pulse has the abnormality, the control output is all interrupted forcibly. Thus, the transmission information is double-checked with the simple circuit.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a signal transmission device for various control equipment.

(Conventional Example) FIG. 6 shows a method of a signal transmission device used in a conventional remote control system.

On the transmission side, the operation switch 13 can create information by combining a plurality of switches and provide it to the P/S conversion circuit 11. The power supply circuit 15 is the P/S conversion circuit 1
1 can be supplied with an operating voltage. The P/S conversion circuit 11 is a circuit that reads information from the operation switch 13, adds redundant bits, and outputs it as serial data.

On the receiving side, the S/P conversion circuit 23 is a circuit that outputs serial input in parallel. Control switch 27 and transmission normal switch 31 respond to control relay 25 and transmission normal relay 26, respectively. S/P conversion circuit 2
If there is no error in the test using the redundant bits performed in step 3, the control relay 25 will be relay-controlled by the information corresponding to the operation switch 13, and the controlled device connected to the output terminal 29 will be operated. This is because the transmission normal relay 26 is turned on because there is no error in the inspection result of the transmission information.

On the receiving side, if there is an error in the test using the redundant bits, the normal transmission relay 26 is turned off and all control outputs can be cut off.

(Problems to be Solved by the Invention) As described above, in the conventional signal transmission device, redundant bits are used to determine correctness. However, there are cases where it is judged to be correct even though there is actually an error. That is, for some reason, checking using redundant bits may not be able to detect errors in all situations.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a signal transmission device that can double-check transmitted information with a simple circuit.

[Structure of the Invention] (Means for Solving the Problems) A means for transmitting information by adding redundant bits to switch information on a transmitting side; and a means for transmitting information from the information transmitting means on a receiving side. information receiving means that receives the information, performs an error check using the redundant bits, obtains a control output to the controlled device if there is no error, and cuts off all the control outputs if there is an error. In the signal transmission device, means for further adding a periodic pulse to the switch information on the transmitting side, and forcibly all of the control outputs when there is an abnormality in the periodic pulse even if the information receiving means does not have the above error. It is equipped with a means for disconnecting.

(Function) The signal transmission device of the present invention can check the transmitted information by adding periodic pulse information to the transmitted information and transmitting it, and detecting this pulse on the receiving side.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.

On the transmitting side, the input terminal of the P/S conversion circuit 57 is
A plurality of operation switches 51 are connected in parallel, and an output terminal of a power supply circuit 55 is connected to the power supply terminal.

The clock output terminal of the P/S conversion circuit 57 is connected to the clock input terminal of a D-type flip-flop (hereinafter referred to as D-PP) 56, and the Q output terminal of the D-PP 56 is connected to the P/S conversion circuit 57.
It is connected to one of the information input terminals of the S conversion circuit 57. The Q output terminal of the D-PP56 is connected to the D input terminal of the D-I'F56.

On the receiving side, the output terminals of the five S/P conversion circuits are connected to a plurality of control relays 6], and a specific first output terminal is connected to the input terminal of an integrating circuit 67. A specific second output terminal of the S/P conversion circuit 59 is a transmission normal relay 65
It is connected to the. The output terminal of the integration circuit 67 is connected to the integration output relay 63. Multiple control switches 69
One of them is connected to a control output terminal 75, and the other is connected to a common terminal 76 (power supply terminal) via a transmission normal switch 71 and an integral output switch 73 in series.

FIG. 2 shows the integrating circuit 67.

The capacitor C1 constituting the integrating circuit 67 has one terminal connected to the S/P conversion circuit 5 as an input terminal of the integrating circuit 67.
one specific first output terminal, and the other terminal is connected to the anode of the forward diode SR2.

Furthermore, this anode is connected to a diode SI? whose anode is grounded. The cathodes of l are connected. The cathode of the diode SR2 is connected to the base terminal of the common emitter transistor Tri through a resistor R1 and a resistor R3 in series. Is the resistance positive? 3 is connected to the other terminal of a capacitor C2, one end of which is grounded, and the other terminal of a resistor R2, one end of which is grounded. Transistor Tri
The coreft terminal of is connected to an integral output relay 63 as an output terminal of this integral circuit 67.

Returning to FIG. 1, the operation on the transmitting side will be explained first.

When the five operation switches are operated, the output thereof is inputted to the P/S conversion circuit 57 as switch combination information. The power supply circuit 55 can supply an operating voltage to the P/S conversion circuit 57.

The D-PP 56 can input a clock from the P/S conversion circuit 57 every time serial data is transmitted, and can input the clock to the P/S conversion circuit 57 as pulse information.

FIG. 3 shows the truth table of the D-FF56.

On the other hand, on the receiving side, the S/P conversion circuit 59 converts the serial input into parallel and connects the control relay 61 to the integration circuit 6.
7 and the transmission normal relay 65. Control switch 69. The transmission normal switch 71 and the integral output switch 73 are connected to the control relay 6] and the transmission normal relay 65.
and integral output relay 63, respectively.

The integrating circuit 67 integrates the pulse information of the D-FF 56 in the above-mentioned transmission information, and when this output is "1", it can excite the integral output relay 63 and turn on the integral output switch 73. In the integrating circuit of FIG. 2, resistor R1 and resistor R3 are current limiting resistors. The integration time is determined by capacitor C2 and resistor R2.

Next, a method for inspecting transmitted information will be explained with reference to FIGS. 4 and 5.

On the transmitting side, the operation switch information (XI to Xn) shown in FIG. 4(a) is read periodically according to the read pulse shown in FIG. 4(b), and is transmitted with redundant bits (Bee) added. . When the transmission is completed, D-PP56
The transmission end pulse shown in FIG. 4(C) is sent to the clock input terminal of . Since the Q output terminal of the D-PP56 is connected to the D input terminal, the Q output (xO) is inverted as shown in Fig. 4(d) every time the transmission end pulse is applied to the clock input terminal of the D-PP56. . Since the Q output is input to the information input terminal of the P/S conversion circuit 57 together with the switch operation information, xO of the serial data in FIG. 4(a) is lo",
0"J", 0°° and so on are repeated periodically.

On the receiving side, the transmitted serial data information shown in FIG. 5(a) is checked using redundant bits, and if there is no error, the S/
The P conversion circuit 59 converts the operation switch information into parallel data and outputs the parallel data. If there is an error in the serial data information, the transmission normal pulse shown in FIG. 5(b) will not be emitted, the transmission normal switch 71 will be turned off, and the control output will be cut off.

Since the transmitted serial data includes the pulse information shown in FIG. 5(c) as well as the switch operation information, if there is no error in the transmitted information, the pulse information is also output. This pulse information output is input to the integrating circuit 67 to obtain the output shown in FIG. 5(d). This integrated output is output at a time of (2T1+α) as shown in FIG. 5(d) with respect to the period TI in FIG. 5(C).

If there is no transmission error, the pulse information shown in FIG. 5(C) is always output, so that the integral output shown in FIG. 5(d) can always be obtained. Therefore, the integral output relay 63 is always excited and the integral output switch 71 is turned on. Errors in transmission information occur continuously, resulting in (2TI+a) in Figure 5(d).
When the pulse information shown in the figure (C) is not output during this period, that is, when the pulse information is not periodically repeated as 0°', 1°', 0'', 1°'', the integral output relay 63 is energized. Therefore, the integral output switch 73 is turned off.

Furthermore, if the element of the control relay 61 itself becomes energized due to some kind of failure, if the power is cut off at least on the transmitting side, the pulse information shown in FIG. 4(d) will no longer be periodically transmitted. As a result, the integral output switch 73 is turned off, and the control output can be cut off.

As shown in FIG. 2, the integrator circuit used in the embodiment of the present invention prohibits direct current components with a capacitor C1. Therefore, even if the pulse information output in FIG. 5(C) is fixed at "1" or "0", no current is supplied to the transistor Tri, and it is possible to prevent the integral output relay 63 from becoming excited.

Although this embodiment uses an OR integration circuit, a monostable multivibrator may also be used.

[Effects of the Invention] According to the present invention, transmission information can be checked twice with a simple circuit, and a controlled object can be controlled safely and reliably.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing an integrating circuit of the embodiment of the present invention, and FIG. 3 is a diagram showing an rl transistor. Figure 1 shows the truth table of the DPF used in the present invention, Figure 4 shows the signal on the transmitting side of the present invention, Figure 4 shows the signal on the receiving side of the present invention, FIG. 6 is a diagram showing a conventional embodiment. 11. 57...P/S conversion circuit, 13.51...
Operation switch, 15.55... Power supply circuit, 56...
D-PP.

Claims (1)

[Scope of Claims] Means on the transmitting side for transmitting information by adding redundant bits to switch information; and means on the receiving side for receiving information from the information transmitting means and using the redundant bits. and an information receiving means for performing an error check, and obtaining a control output to the controlled device if there is no error, and cutting off all the control outputs if there is an error, the transmitting side means for further adding a periodic pulse to the switch information; and means for forcibly cutting off all of the control outputs when there is an abnormality in the periodic pulse even if there is no error in the information receiving means. A signal transmission device characterized by: