SU1406589A1 - Information input device - Google Patents

Abstract

The invention relates to automation and computing and can be applied to keyboards for inputting information. The aim of the invention is to improve reliability by testing the device. The device contains a keyboard, an encoder, a control unit, a register, a counter, a decoder, a one-shot, an indicator, a reference element, a trigger, three switches, two AND-OR elements, an AND element and an OR element. Thanks to the newly introduced elements, the device is monitored in the modes of inputting information from the keyboard into the register and output from it to the external device. Testing is performed step by step and the result is displayed on the indicator. 1 hp f-ly, 4 ill. with s

Description

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The invention relates to automation and computing and can be applied to keyboards for inputting information.

The aim of the invention is to increase reliability by enabling the device to be tested. one,; Fig, 1 shows the functional ™; on the diagram of the proposed device; in fig. 2 - functional diagram of the control unit; in fig. 3 and 4 - diagrams of the device. I The device (Fig. 1) contains a keyboard 1, an encoder 2, a register 3, a control block 4, an indicator 5, counter 6, comparison element 7, decoder 8, trigger 9, AND-OR JIG elements, 11, And 12, the element OR | 13, the element NOT 14, the one-shot 15, the first switch 16, the third switch 17, the second switch 18, the bus 19-21. I The control unit (Fig. 2) contains the counter 22, the decoder 23, the third 24 and the second 25 triggers, the second 26 | And the third 27 And elements, the group of And elements 28, the delay element 29.

The input device (} jurmatia works in the following way.

In the initial state, the register 3, the counter 6, the trigger 9, the counter 22 of the control unit 4 are set to the zero state by a signal from the installation line 21 to the initial state. The Work-Control switch 18 is set to the Work | Position. By successively pressing the keys of the keyboard 1, a message is typed. When pressing the keys of the keyboard 1, a parallel binary code is generated at the first output of the encoder 2, arriving at the D input of register 3 and n AND-OR 11 element, but not passing further to indicator 5, since the switch 18 is set to the upper position and the zero signal from the output of the element NOT 14 blocks the element AND-OR 11. At the same time, at the second output of the encoder 2, a pulsed signal of the presence of a code is sent to the second input of the control unit 4, through the element 26 and to the C-input of the counter 22 and through the element 29 delays and element 27 and - to the strobe the input of the group of elements And 28. According to the signals from the output of the group of elements And 28 (the first output of the control unit 4), the information is

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written into the trigger group of register 3,

When the nth character of the information is typed in control block 4, the PGM output of the decoder 23 appears to be high, the zeroing signal of the flip-flops 24 and 25 is removed, the presence signal of the code from the output of the delay element 29 sets the trigger 29 to the single state and blocks further passage of the code presence signals through the And 26 element. When trying to dial (the n + D-ro sign of the code, the code availability signal sets the trigger 25 to one state and blocks the passage of delayed signals of the code presence through the 27 element.

To output information to the external device, a switch 16 is pressed, the output of the one-shot 15 is a pulse signal that sets trigger one in the one state when there is a high level on the second S input of the trigger 9, which comes from the third output of the control unit 4 (low output bit decoder 23). When the external device is ready to receive information, a high level is received on the control line 20, the inputs through the AND-OR element 10 (switch 18 are in the Work position) and the AND 12 element to the C input of the counter 6. Signals from the output of the decoder 8 allow alternate output of information from the group of triggers of register 3 to an external device with sequential input of signals on the control line 20 requesting information from the device. Information from the output of register 3 also goes to the element AND-OR 11, but does not pass through it to the indicator 5, since the zero signal from the output of the element NOT 14 blocks the element AND-OR 11.

After the output of the device of m characters of information previously recorded in register 3, when a (w + 1) -th signal arrives on the control line 20, a signal appears in the zero state of register 3, counter 6,. trigger 9 and counter 22 of control unit 4. This is where the process of outputting information to the external device ends - it is prepared for the next message set.

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20

In the control mode, the switch 18 is set to the lower position Control, the signals are not allowed to pass through the control line 20 through the AND-OR element 10. Pressing the keys of the keyboard 1 in the same way as described above records the typed information into the register 3. The binary code from the first output of the encoder 2 through the element AND-OR 11 enters the indicator 5, which reflects the binary code corresponding to the pressed button of the keyboard 1. Due to this, it is possible to check the operability of the buttons of the keyboard and encoder without the use of auxiliary test equipment and quick localization of a faulty node.

To control the information output process, a switch 16 is pressed, the trigger 9 is set to one. When the control switch 17 is pressed, the signal through the AND-OR element 10 and the And 12 element enters the C input of the counter 6, the first output of the decoder 8 has a signal that allows the information recorded earlier in the register 3 to pass through the AND-OR element 11 indicator 5, on which the binary code of the first character of the information stored in register 3 is displayed. When the switch 17 is pressed successively, the binary code of the subsequent characters of the information recorded in register 3 is displayed on the indicator 5. aka of register 3 at a subsequent press switch 17 at the output of the comparison element 7 is a signal that sets a null state register 3, the counter 6, the trigger 9 and the counter 22 controlling unit 4 ..

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Claims (2)

1. An information input device comprising a keyboard, the output of which is connected to the input of the encoder, a register, the output of which is the output of the device, and the information input is connected to the first output of the encoder, the control unit, the counter, the decoder, the reference element, the trigger, the And element, element OR, the first switch, the output of which through the one-shot is connected to the first input of the trigger setup, the direct output of the trigger is connected to the first input of the AND element, the output of which is connected to the counter clock input, the reset input of which is connected to the output of the OR element, the reset input of the register and the trigger, the first input of the control unit, the second input of which dinene with the second output of the encoder, the third input with the inverse output of the trigger, the first output of the control unit is connected to the synchronous input of the register, the second output with the second input - the setting of the trigger, the third output with the first input of the element that comparison, the second input of which soedsh.en a yield meter and the input of the decoder, and the output - to the first input of the OR gate, the second input of which is an input device setting, the decoder output is connected to the control input of the register, wherein so that, in order to increase reliability due to the possibility of testing the device, the first and second AND-OR elements, the NOT element, the indicator, the second and third switches, the first input of the first AND-OR element are connected to the first output of the encoder, the second and the third input with the output of the element is NOT and the first input of the second element is AND-OR, the fourth input is with the output of the register, and the output is with the input of the indicator, the second input of the second AND-OR element is the control input of the device, the third input is connected to the output of the second switch and the entrance the element is NOT, the fourth input is with the output of the third switch, and the output is with the second input of element I. 2. The device, under item 2, about t of l and Since the control unit contains the second counter, the second decoder, the second and third elements AND, the delay element, the group of elements AND whose outputs are the first output of the block, the output of the lower bit of the decoder is the second output of the block, the outputs of the higher digit of the decoder are the third output of the block and are connected to the first inputs of elements of the group I, the reset input of the second counter is the first input of the block, the first input of the second element I is connected to the first input of the installation of the second trigger and through the delay element with the first input TpBTbei o of the element And and the first input of the installation of the third trigger and is the second input of the block, the second inputs of the second and third elements And are the third input of the block, the output of the second element And is connected to the counting input of the second counter, 896 The second bit of the second decoder is connected to the second input of the third flip-flop installation and the reset inputs of the second and third flip-flops, the direct output of the third flip-flop is connected to the second input of the second flip-flop, the inverse output of which is connected to the third input of the third element the output of which is connected to the input of the second and that And, the inverse output of the third trigre decoder, the output of the third element And is connected to the second inputs of elements And groups, the output is older. / Hera is connected to the first element I. the third entrance is a second exit. Output EL.26. You; (one EL.27 Exit "About EL.23 Exit .G EL.23 Output EL.281 Output 2 EL 23 Output EL.282 Exit „p EL.23 Output HL.28p Output "t 5L.2 " You move „About EL.25 Fig li