JPS6331242A - Switch signal transfer system - Google Patents

Abstract

PURPOSE:To reduce the influence of an inductive noise by using a bipolar double throw switch, transmitting two types of signals of the same phase through a pair of different cables and taking the AND of the two types of the signals in a receiving side. CONSTITUTION:When the switch 1-1 of a switch device 1 is turned on, the output of converting circuits 1-2-1, 1-2-3 is changed to a logic 1 and the output of other converting circuits 1-2-2, 1-2-4 is changed to a logic 0. Accordingly, the output of chatter absorbing circuits 1-3-1, 1-3-2 is changed to the logic '1' and fed to a switch signal receiver 3 through line driver circuit 1-4-1, 1-4-2 and a pair of cables 2-1, 2-2. Line receiver circuits respectively receive the signals of the logic '1' and output an output '1' from an AND circuit 3-3. This is recognized as the signal of a switch on.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a signal transfer method for an information processing device, and in particular,
This invention relates to a highly reliable switch signal transfer method.

[Conventional technology]

The conventional switch signal transfer method is a switch.

Switch signal voltage level conversion circuit, chatter absorption circuit,
It consisted of a line driver circuit, cable, line receiver circuit, and switch signal capture circuit.

[Problem that the invention seeks to solve]

In the conventional switch signal transfer method, which has two sides, the switch signal is transferred through a single cable, and the logic level of the signal on that cable is checked to determine whether or not the switch has been pressed. has been decided.

As a result, there is a drawback that it is susceptible to induced noise occurring in the signal transfer path.

An object of the present invention is to provide a highly reliable switch signal transfer method that is completely unaffected by induced noise occurring in the signal transfer path.

[Means for solving problems]

The switch signal transfer method of the present invention is a switch signal transfer method for an information processing device or system in which a logic circuit is activated in response to a switch signal. It has four conversion circuits that convert the voltage to , two logic circuits that absorb the switch chatter of each pole, and two line driver circuits that correspond to these logic circuits and send out the outputs of these logic circuits. a switch device, a pair of cables each transmitting the output of the line driver circuit, and two line receivers receiving the output of the line driver circuit sent through each of these cables.
and a switch signal receiving device having an AND circuit for calculating the AND of the outputs of these line receiver circuits.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a logic circuit system diagram showing one embodiment of the present invention. 1 is a switch device, 2 is a pair of cables, and 3 is a switch signal receiving device.

The switch device 1 has the following configuration. That is, 1-1
is a two-pole double-throw switch (hereinafter referred to as a switch) with transfer contacts 1-1-1.1-1-2, l-2-1 to 1
2-4 is a conversion circuit (COVT) that converts the switch signal to a logic signal level, 1-12 is a logic circuit that absorbs chatter of the switch signal (hereinafter referred to as chatter absorption circuit), and 1-4-1.1 -4-2 is a line driver circuit.

The cables 2 form a pair including a first cable 2-1 and a second cable 2-2.

The switch signal receiving device 3 also includes a line receiver circuit 3-L 3-2 and an AND circuit 3-3 that ANDs the outputs of these two line receiver circuits 3-1 and 3-2. It is provided.

Next, the operation of these circuits will be explained. In the state shown in FIG. 1, that is, the state in which the double-pole double-throw switch 1-1 is not pressed, the outputs of the conversion circuits 1-1-1 and 12-3 are logic "0", and the outputs of the other conversion circuits are at logic "0". Circuits 1-2-2 and 1-2-4 are at logic "1". The chatter absorption circuit 1-3-1 is composed of a two-man NAND gate task circuit, and the conversion circuit 12-1 on the input side has a logic "0", and the conversion circuit 1-2-2 has a logic "1". Therefore, the output is aO'', and the line driver circuit 1-4-
1 and the first cable 2-1 to send a logic "O" to the switch signal receiving device 3.

Similarly, the chatter absorption circuit 1-3-2 is also composed of a two-man NAND gate task circuit, with the conversion circuit 1-2-3 on the input side being logic "0" and the conversion circuit 1-2-4 being logic "0". Therefore, the output of the chatter absorption circuit 1-3-2 becomes logic "0" and outputs logic "0" through the line driver circuit 1-4-2 and the second cable 2-2. The signal is sent to the switch signal receiving device 3.

Line receiver circuit 3-1 of switch signal receiving device 3
and 3-2, the input is logic “0”, so the output is logic “0”.
Therefore, since both inputs of the AND circuit 3-3 are logic "0", the output is also logic "0", and it can be known that the switch 1-1 of the switch device 1 is inactive. .

Next, when switch 1-1 of switch device 1 is turned on (
), conversion circuits 1-2-1 and 1
The output of 2-3 is logic "1", and the other conversion circuits 1i2 and 1
The output of -2-4 changes to logic "0". Therefore, the outputs of chatter absorption circuits 1-3-1 and 1-3-2 are logic "1".
and a line driver circuit 14-1.14-2 and a pair of cables 2-1.2- corresponding to each circuit.
2 to the switch signal receiving device 3.

The chatter of the switch is caused by the chatter absorbing circuit 1 between the switch 1-1 leaving the play contact and contacting the meter contact.
-1-1.1-3-2.

On the other hand, the line receiver circuits 3-1 and 3-2 of the switch signal receiver w3 each receive a logic "1" signal,
Each outputs a logic "M".

In the subsequent AND circuit 3-3, an AND is established between these two signals and outputs "1". This is recognized as a switch-on signal.

Also, the operation when the switch is turned off is the same as the first one according to the above explanation.
The circuit shown in the figure can be operated.

〔Effect of the invention〕

As explained above, according to the present invention, two types of in-phase signals are generated using a two-pole double-throw switch, and each signal is transmitted through a different pair of cables, and the receiving side receives these two types of signals. Since it is possible to determine whether a switch is on or off by taking the logical product of be.

[Brief explanation of the drawing]

FIG. 1 is a logic circuit system diagram showing one embodiment of the present invention. 1...Switch device 1-1...2-pole double-throw switch 1-2-1~1
-2-4...Conversion circuit 1-3-1. l-3-2...Chatter absorption circuit 1-4-1.1-4-2...Line driver circuit 2...Cable

Claims (1)

[Claims] (1) In a switch signal transfer method for an information processing device or system in which a logic circuit is activated in response to a switch signal, a two-pole double-throw switch having a transfer contact;
There are four conversion circuits that convert the voltage of each switch contact to a logic level, two logic circuits that absorb the switch chatter of each pole, and two logic circuits that correspond to these logic circuits and send out the outputs of these logic circuits. a switch device having a line driver circuit; a pair of cables each transmitting the output of the line driver circuit; two line receiver circuits receiving the output of the line driver circuit sent through each of these cables; A switch signal transfer system comprising: a switch signal receiving device having an AND circuit that takes an AND of the outputs of the line receiver circuit;