SU1442997A1 - Device for interfacing computer with subscriber via serial communication channel - Google Patents

Abstract

The invention relates to computational and can be used in display devices for information j whose communication with a computer is an O1, connected via a serial communication channel. The purpose of the invention

Description

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is an increase in the noise immunity of the device in operation. The device contains a switch I modes of operation, the transmitter 3, the receiver 4, the first element And 6, the element NOT 7, nepBtM depshfrator 8, the trigger 10, PMfrator 11, the counter 13, the second element And 14, the inverter 15 AC code in serial, the driver 16 pulses , serial converter 18,: The invention relates to computing technique and can be used in information display devices, the communication of which with a computer is carried out via a two-wire communication cable in accordance with a serial interface protocol.

The purpose of the invention is to improve the noise immunity of the device in the operating mode "

Fig „presents a block diagram of the device I on fkg, 2 - the block diagram of the identification identification of the word,

The device contains (FIG. 1) a switch of operating modes, a second 2.1 and a third 2.2 outlets of switch 1, a transmitter 3, a receiver 4, a second 5. and a third 5.2 receiver 45 first: element And br element NOT 7 , first decoder 8, first 9.1 and second 9.2 outputs of decoder 8, trigger 10, encoder 1, first 12.1 and second 12.2 outputs of encoder 11, counter 13, second element And 14 converter 15 of the parallel core to serial 5 driver 16 pulses, the first 17.2, the second 17.3, the third 17.1 and the fourth 17.4, the output of the driver 16 pulses, the Converter 18 sequence code in parallel, element OR 19, word reception identification block 20., switch 21, generator I1 of 22 shuls, third element AND 23, register 24, comparison element 25, register of control code 26, driver 27 of control signals, second decrypt 28, the output 29 of the device dp connection information input subscriber:

in pa, parallel, OR element 19, word identification block 20, switch 21, pulse generator 22, AND 23 third element, register 24, comparison element 25, control code register 26, control signal generator 27, second decoder 28. The device provides communication of a computer with an information display device with an analysis of faulty situations. 13 . p, f-ly, 2 silt,

inputs 30 and 3 of the device for connecting the information output and the first synchronization output of the computer, v. output 32 of the device for connecting the error input of the computer, input 33 of the device for connecting the output of the subscriber initial subscriber,

The word reception identification block 20 contains (FIG. 2) the first 34, the second 35, the third 36 And elements, the first 37, the second 38 and the third 39 NOT elements and the counter 40,

The pulse shaper is made on the IC 533IR16.

The device works as follows.

In the initial state, the generator 22 operates in a continuous mode, the tri-ger 10 and the driver 16 are reset by the initial setup signal; nocTj - sent to the input 33 from the subscriber, at the inputs and outputs, the device has no signals, switch 1 is set to the Work position, output 2.1 is present signal / P - S n logical O, output 2.2, - signal level logical 1 ka the output of element 7 is NOT a signal of the level of a logical unit of 5 permitting 1 pin to receive converter I., from the second output of the decoder 8 and from the output of the element I 3 to the inputs of the comparison element 25 and the decoder 28 "At the output of element 25 is absent error signal

Upon receipt at the input 30 of the code of the word, intended: - for - gs.c-gchi about the interface line-, and input 3 (- g - gnala escortacch

with the transfer of words through the switch 21. Signal with. the input 31 through the element 19 enters the control input of the converter 15, allowing recording into the converter of the word 21 present at the output of the switch. The same signal is fed to the input of the imager 16, initiating the issuance at its inputs of a sequence of shifted

one relative other pulse signals, sets in

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the counter 13, as well as generates a level 1 signal at the output of the trigger 10. The duration of the signals at the outputs of the driver 16 is equal to the period of the clock signal from the generator 22. The signals from the third output of the driver 16 are fed to the shift control input of the converter 15, initiating a shift recorded in it n-bit word, starting with the higher bit, and

20 at the output of the element 7 is a logic level signal O, which prohibits the converter 18 from receiving output 9.1 of the decoder 8 and the signals from the output 25 of the block 20 to the input of the comparison element 25 and the decoder 28 at receiving the shift control. When a trigger 10 is set to O at the output element And 6 there is a signal level of the assignment of it in the serial code to the output of the converter 15.

After issuing 16 n signals from the fourth driver, the signal of the word output feature is generated at the code of the counter 13. This signal

arrives at the shaper 16, inhibiting the 30–7 signal of the level of logical 1. shchreftnun) outputting signals to the outputs 17.1-17.4. The encoder 11 when arriving on the line of interface O, the output element is NOT

the arrival of signals from the first and second steps of the former 16 converts the serial code, which is output from the output of the converter 15, into a combination of two signals at the outputs of the encoder, corresponding to the sequential code at its input. The transmitter 3 converts the combination of unipolar signals at the outputs of the encoder 11 into a combination of two different-polarity pulses fed to the input of the receiver 4 and through switch 1 to the output 29 of the device.

Receiver 4 converts a combination of two opposite-polarity pulses into a combination of two unipolar signals received by the decoder 8 through the outputs of receiver 4. The decoder 8 converts the combination of signals at the outputs of receiver 4 into the serial code of the received bit of information

At output 9.2 and the accompaniment signal gg, identify the word received from the output 9.1 output. In block 20, the output of the interface and recorded in the count is the number of signals from the equalizer 1B. If the received word YOUR frequency from the oscillator 22 is in the interim indication word, then at the time of the time between the arrival of the transponder of the decoder 28 upon receipt

the escort bit from the second output of the decoder 8.

If in the specified interval the number of clock signals reaches the value of t, then at the output of block 20, a word reception identification signal is formed (the time interval between the bits in the word K times less than the minimum

jQ inteel time between the last bit of the previous one and the first bit of the next word). When this signal arrives at trigger input 10, the latter is set to O. On

15, its output is forked by a signal al-level logic zero. Thus, at the time of transmission of the word at the output of the trigger 10 and at the output of the element And 6 there is a signal of logical 1,

20 at the output of the element 7 is a logic level signal O, which prohibits the converter 18 from receiving output 9.1 of the decoder 8 and the signals from the output 25 of the block 20 to the input of the comparison element 25 and the decoder 28 at receiving the shift control. When a trigger 10 is set to O at the output element 6 there is a level log signal

on the output element is NOT

To the subscriber, the word of information is the various polarities that constitute

the word of information, comes through switch 1 to the input of the receiver 4. The operation of the receiver 4, the decoder 8, block 20 is similar to the work when a signal arrives at the device input

31. The logic level 1 signal at the output of the NOT 7 element allows the input to the shift control of the converter 18 through the AND 14 element of the tracking signal of the received bit of information from the output of the 9.1 decoder. Upon receipt of the n tracking signals at the output of the converter 8, the received n-bit word is present in the parallel code. The logical 1 signal at the input of the NOT element 7 permits the transmission to the output of the AND 23 element of the word reception identification signal from the output of block 20, This. the signal goes to the output device.

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the signal from the output of the element 23 of the formformer 28 forms the signal of

of this statement, which is

Route is a sign of indication.

When setting the switch

the transfer of the pa output of the formula is invented

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the position of Anton on the set of the code of the controller 21 of the register 24 contents. Roller word on the register 26 pressing the button on the driver 27 at its output a signal is generated allowing the control word code to be transmitted through the switch 21. The same signal through the element OR 19 is fed to the control input of the transducer 15., allowing the recording of the control word code present at the output of the switch 21, as well as to the inputs of the driver 16, counter 3 and trigger 10. The operation of the converter 15, the driver 16, counter 13, trigger 10, encoder 11, transmitter 3, receiver A, decoder 8 and block 20 is logical to work when a signal arrives at the input 31 of the device.

1. A device for interfacing with a subscriber via a serial communication channel, containing a work switch, receiver, n, 11; atchik, guard, second de pythrato, first AND element, encoder, account

(5 pulse generator, parallel-to-to-serial converter 1, convert serial code to parallel, receive identification block with pulse generator, switch, register, control register register control signal generator, repj comparison element and element with the first output of the switch

When the switch 1 is set to the Autonomous position, signals from the transmitter 3 to the device output 29 are not received, output 2.2 of the switch 1 and output element I 6 have a signal of the level 0

output switch 2.1

Chip 1 is a logic level signal I. At the same time, the output of the NOT 7 element is constantly present at the signal of the logic level, allowing reception to the converter 18 of the signals from the output 9.1 of the decoder 8 and transfer to the output of the element And 23 signals from the output of the block 20. Operation of the converter 18 and the decoder 28 is similar to the operation when the information word enters through the interface line. In the comparison element 25, upon receipt of a signal from the output of the block 20 through the AND 23 element and in the presence of a logic level 1 signal, the first output of the switch 1 is compared code of the control word set on register 26 and the code present at the output of converter 18. If the specified codes do not match, the output of the comparison element 25 generates an error signal that goes to the output 32 of the device, a fault indicator and a register 24. I to the Operational position and the flow along the interface line to the display device of the diagnostic indication on the output of the direct indication, which can be

the transfer of the pa output of the formula of the invention is solved

torus 21 of the contents of the register 24.

torus 21 of the contents of the register 24.

Claims (1)

1. A device for interfacing a subscriber with a subscriber via a serial communication channel, comprising a work switch, receiver, re-, 11; atchik, guard, second desifratora — first element I, encoder, counter, pulse generator, element OR parallel code to serial converter 1, serial code to parallel converter, word reception identification block, pulse generator, switch, register, control code register, control signal generator, trig repj reference element and NOT element, with the first switch output modes of operation are connected to the output of the device to connect the information output of the subscriber, the first input of the mode switch of operation is connected to the output of the transmitter and the receiver input, the second, third inputs and the second, third outputs of the mode switch of the connection, respectively, with the first input of the comparison element and with the first input The first element And, the second input and output of which are connected respectively to the output of the trigger and to the input of the element NOT, the first, second inputs of the transmitter are connected to the first, second coded encoder, the first, the second, third inputs of which are connected respectively with the first, second outputs of the pulse former to output transform is paratt the coded serial code, the synchronization input of which, fi also the synchronization inputs of the trigger, the counter, and the first synchronization input of the driver of the impulses is connected; with the output of the OR element, the third ,, four-vertical output of the imaging device and pulses are connected respectively to the input of the shift control of the parallel-to-serial code converter and with the counting input of the counter, the upstream of which is connected to the second synchronization input of the unit; - the input of the device for connecting vig-: o) K.I chal:. (NOAE 1-tor.y abokent. 7 connected to the zero trigger input and to the reset input of the pulse former, the third synchronization input of which is connected to the output of the pulse generator and the synchronization input of the word reception identification block, whose information input is connected to the first input of the first decoder, the first, second inputs and output of which are connected respectively to the first, second outputs of the receiver and with the information input of the serial to parallel converter, the output of which is connected to the second input of the reference element, with the first The second input of the decoder and with the output of the device for connecting the computer information input, the output of the control code register is connected to the third input of the comparison element and the first information input of the switch, the second center third information inputs of which are connected respectively to the input of the computer and with the register output, the information input of which is connected to the output of the comparison element and with the output of the device for connecting the error input of the computer, the output of the second deisfrator connection with the output of the device for connecting the diagnostic mode indication input of the computer, with the first input of the OR element and with the first control input of the switch, the second control input of which is connected to the input of the device for connecting the first synchronization output of the computer, and the output of the signal generator - the monitoring time is connected to the third input of the OR element and to the third control input of the switch, the output of which is connected to the information input of the parallel code to the serial one, the input of the device dp connect tim second computer synchronization output connected to the input SYNC is 20 25 30 35 40 45 42997 register. It differs because, in order to increase the noise immunity of the device in the operating mode, the second, third AND elements are entered into it, the output of the element is NOT connected to the first inputs of the second and third elements, And the second input of the second element And it is connected to the second output of the first decoder and to the information input. the house of the word reception identification block, the output of which is connected to a single trigger input and to the second input of the third element AND whose output is connected to the fourth input of the comparison element, to the second input of the second decoder and to the output of the device to connect the computer synchronization input, the output of the second And element connected with the information input of the serial code of the serial code to parallel converter. t 2, The device is pop, 1 is different from the EU, in that the word reception identification block contains the first, second, third elements AND, the first to third elements are NOT and the counter, and the synchronization input of the block is connected to the first inputs of the first, second And elements, the information input of the block is connected to the second input of the first element AND and through the first element NOT to the second input of the second element AND, the outputs of the first, second elements AND are connected respectively to the synchronization and reset inputs of the counter, the first to the fourth outputs of which are connected respectively etstvenno to a first input of the third AND gate through a second NOT element - to a second input of the third AND gate through a third element not-- to a third input of the third AND gate and to a fourth input of the third AND gate, whose output is the output unit.