SU1405043A1 - Data input device - Google Patents

Abstract

The invention relates to automation and computing, in particular, to keyboard devices for entering information, and can be used in microprocessor, display, negotiation, code blocking and other devices. The purpose of the invention is to increase the reliability of the device. The device contains 1.4 pulse shapers, a pulse distributor 2, a keyboard 3, groups 5 and 6 of 2K-IPI elements, element 7, decoders 8.9. The invention allows to block information when unauthorized actions of the operator, for example, and more switch buttons. 6 pieces s (c

Description

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The invention relates to automation and computing, in particular, to keyboard-type input devices, and can be used in display technology, microcalculators, intercoms, code-blocking and other devices.

The purpose of the invention is to increase the reliability of the device.

Figure 1 shows the structural diagram of the device; FIGS. 2-6 are a circuit of a pulse driver, a pulse distributor, a group pulse generator and decoders, respectively.

The device contains a pulse shaper 1, pulse distributors 2, a keyboard, pulse shapers 4, groups 5 and 6 of elements 2I-Sh1I, element 7, decoders 8 and 9.

The device works as follows.

With the closure of the contacts of one of the elements of the keyboard 3 on the circuit driver 1 - valve 2 - keyboard element 3 - driver

4 current flows, resulting in

at the same input of group 5 and at the same input of group 6 there are zero-level signals covering one half of elements 2I-OR of groups 5 and 5, and consequently, at the output of element 7, together with the signal of shaper 1, a single signal level is formed, indicating the presence of reliable information on the outputs of the decoders 8 and 9. When closing the contacts of two or more elements of the keyboard 3, both halves at least in the. one element 2I-OR groups

5 and 6 are locked, which prohibits the AND 7 from issuing a sync signal. Information on the outputs of the decoders 8

and 9 is considered unreliable and not perceived by the consumer.

Thus, locking the output of the sync pulse ensures control over the authorized single actuation of the keyboard elements 3. At the same time, the sequential chain of the keyboard elements 3 with the formers 1 and 4 and the distributors 2 ensures the increased reliability of the device with regard to the additional gating of the element I 7.

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Claims (1)

Invention Formula A device for inputting information containing a keyboard, the outputs of which are connected to the inputs of the corresponding group of pulse shapers, the outputs of which are connected to the corresponding inputs of the first decoder, the second decoder, and the AND element, which, in order to increase the reliability of the device, contains a pulse shaper, one output of which is connected to the input of the element I, pulse distributors whose inputs are connected to another output of the pulse former, one output - with the corresponding inputs of the clamps Atura, and other outputs - with the corresponding inputs of the second decoder, the first group of elements 2И-OR, whose inputs are connected to the corresponding inputs of the second decoder, and outputs - to the corresponding inputs of the first group of element And, and the second group of elements 2И-OR, whose inputs are connected with the outputs of the corresponding group pulse formers, and the outputs with the corresponding inputs of the second group of the element I, the output of which is the synchronizing output of the device, the outputs of the elements 2I-IPI of the first and second groups are tvetstvuyuschimi information device outputs. Fmg.2 FIG. five . Phie. la 4D L iUJLlJ Lh. f z Y1 Uz Fi.V