SU758121A1 - Information input arrangement - Google Patents

Description

The invention relates to computing and is intended to enter information.

A device for inputting information is known, comprising a pulse generator, a decoder, a counter, a keyboard [1].

A disadvantage of this device is the low accuracy of the introductory information.

The closest technical solution to the proposed is a device for inputting information containing two groups of switching elements, normally closed contacts of switching elements of the first group are connected to a restricting element, normally open contacts of switching elements of the first group are connected to the power bus, an encoder whose inputs are connected to the switching outputs elements of the second group, and the outputs - with the inputs of the register [2].

The disadvantage of this device is the low accuracy of the input information.

The aim of the invention is to increase the reliability of the entered information. - thirty

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This is achieved by the fact that the device contains an inverter, an AND — NOT element connected in series, a trigger and a one-shot, the output of which is connected to the inputs of switching elements of the second group, the outputs of normally closed contacts of the first group are connected to the inverter and the first input of the element AND —NE, the second input of which connected to another trigger output, the other input of which is connected to the output of the inverter.

The drawing is a block diagram of the device.

The device contains the first group of switching elements 1, the second group of switching elements 2, element AND-NOT 3 ·, trigger 4, one-shot 5, encoder 6, register 7, inverter 8, restrictive element

9.

The device works as follows:

When the device is turned on, the trigger 4 is reset to the initial state by the signal "Reset" ¹ , arriving at its zero setting input.

When you press one of the keys,

containing the appropriate comm-3

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The tactile contacts of the first and second groups 1, 2, first the switching contact of the second group 2 operates, thanks to which a gating signal passage circuit from the single-oscillator 5 · is prepared for the corresponding. yuschy input encoder 6. Then intervention threshold ³ tavaet switching element of the first group 1, which leads to a high potential for entering a limiting member 9 and the first input element AND-NO 3.

At the output of the element AND — NOT 3 a low potential is established, which is fed to a single installation input of trigger 4 and sets it to a single state.

After installing the trigger 4c of its zero arm, a low potential is applied to the second input of the NAND 3 element, prohibiting the receipt of spurious signals to the setup input of the trigger 4 that occurs when the switching elements bounce or when several keys are triggered simultaneously.

After the installation of the trigger 4 in a single state, a high potential arrives from the single arm of the trigger 4 to the input of the one-shot. 5, at the output of which one gating pulse is formed.

From the output of the one-shot 5, the gating pulse arrives at the normally open contacts of the switching elements of the second group 2 and through the pre-closed contact of the second group initially pressed ³³

key enters the input of the encoder 6, the output of which appears the character code corresponding to the key pressed, and enters the setup single inputs of the register 7. 40

In the absence of a pressed key, the low potential from the limiting element 9 is fed through the normally closed contact of the switching elements of the first group 1 to the input of the inverter 8 and then to the synchronization input of trigger 4, setting it to the zero state.

Re-entering information is possible only after the installation of the trigger. 4 to the initial (zero) state, which occurs only when all keys are released.

Claims (1)

Claim A device for entering information containing two groups of switching elements, normally closed contacts of switching elements of the first group are connected to a limiter element, normally open contacts of switching elements of the first group are connected to a power bus, an encoder whose inputs are connected to the outputs of switching elements of the second group, and outputs - with the inputs of the register, characterized in that, in order to increase the reliability of the input information, it contains an inverter connected in series t I-NOT, trigger and one-shot, the output of which is connected to the inputs of the switching elements of the second group, the outputs of normally closed contacts of the first group are connected to the inverter and the first input of the AND – NE element, the second input of which is connected to another output of the trigger, the other input is connected to inverter output.