SU1339575A1 - Device for interfacing user with communication channel - Google Patents

Abstract

The invention relates to computing and can be used to connect two computing systems or a computing control device of test equipment with objects of control over a fiber-optic communication line. The aim of the invention is to expand the functionality of the device by providing control over the format of received and transmitted words. The device contains a receiver, a transmitter, an amplifier, a modulator, a demodulator, a key, two buffer registers, two triggers, two registers, two counters, two decoders, two single vibrators, two elements, a delay, a pulse generator. 1 il. SL5 CO X CL VL SP

Description

The invention relates to computer technology and the brain to be used for the connection of two computer systems or a computer control device (CVM) to a test apparatus with control objects over a fiber-optic communication line.

The purpose of the invention is to expand the functionality of the device by providing control over the format of received and transmitted words.

The drawing shows the functional diagram of the device.

The device (Fig. 1) contains a receiver 1, an amplifier 2, a demodulator 3, a key 4, a buffer register 5, a trigger 6, a register 7, a counter 8, a decoder 9, a delay element 10, a single vibrator 11, an input 12, an output 13, an output 14 , input 15, pulse generator 16, register 17, counter 18, deigraphra 19, delay element 20, one-shot 21 buffer register 22, modulator 23, transmitter 24, trigger 25 inputs 26 and 27 of the device, output 28 of the device

The device operates as follows.

In the initial state, the triggers 6 and 25 are in the zeroed state, and the low level from the output of trigger b keeps the key 4 in the open state, and the low level on the output 14 signals the subscriber that there is no information received in the buffer register 5. A low level from the output of the trigger 25 prohibits the operation of the generator of 16 pulses, i.e. issuing shift pulses to the buffer register 22 and counting pulses to the counter 18.

Registers 7 and 17, counters 8 and 18 are reset. Triggers on the installation inputs of the flip-flops 6 and 25 are missing.

The device is ready to receive and transmit information.

This information is carried out as follows.

The optical signal from the input (optical channel) 12 is fed to the input of the receiver (photodiode) 1. The optical signal converted by photodiode 1 is amplified by amplifier 2 and fed to a demodulator, which demodulates the converted signal. From the output of the demodulator 3 information in the sequential para-phase code of the post

through the public key 4 into the buffer register 5 and simultaneously to the account of the input of the counter 8, which performs the counting of bits in the format of the received word. When reaching the value of the counter 8, equal to the maximum number of bits in the received word format (the maximum format accepted

words in the proposed device - 32 bits), the output of the decoder 9 generates a signal that, through the delay element 10, enters the installation input of the trigger 6, which passes into one state, closing the key 4 and signaling the subscriber about the end of word reception by setting the high level output 14. The signal from the output of the decoder 9 through the element 10 of the delay is also fed to the input of the one-shot I1. The latter forms a single impulse; arriving at the input of the resolution of the parallel record of the counter 8, Since informational

The inputs of the parallel recording of the counter 8 are connected to the output of the register 7, which in the initial state was in the zeroed state, then. on the signal from the single 1 1 in the counter 8, zero information is written, i.e. counter 8 is zeroed, thereby removing the signal from the setup input of trigger 6.

The subscriber, having received the signal from output 14

control object), reads information from the buffer register 5 to. an information path 13; and inputting a pulse signal 15 to an input, which is a sign that the subscriber has read the information from the buffer register 5 by the subscriber.

The pulse signal from input 15 is fed to the input of zeroing trigger 6, it is reset to the initial state.

A low level at the output of the trigger 6 opens the key 4, allowing the passage of information into the buffer register 5. The device is ready to receive the next word.

The key 4 in the proposed device protects the information received in the buffer register 5 before and during

reading by the subscriber from possible failures in the control object, as a result of which an unauthorized signal may appear on the communication line.

The delay element 10 provides the necessary duration of the last bit of the received information for its correct recording in the buffer register 5 and ensures the correct operation of the counter 8.

The transmission of information is as follows.

The subscriber records the information to be transmitted into the buffer register 22 via the information path 26 and at the device input 27 sets an impulse sign of the information recording which is fed to the installation input of the trigger 25 and translates it into a single state. A high level at the output of the trigger 25 enables the generator of 16 pulses, the output of which begins to receive shift pulses at the information shift input from the buffer register 22 and at the same time the same pulses go to the counting input of the counter 18. The latter counts the number of transmitted bits and when the counter reaches 18 equal to the maximum value of bits in a word (the maximum word format in this word is 32 bits), from the corresponding output of the decoder 19, to the input of which signals are received from the parallel outputs of the counter 18, output a signal. The signal from the output of the decoder 19, after the delay element 20 has passed, is fed to the input of the reset trigger 25, setting it to the zero state.

The low level at the output of the trigger 25. prohibits the further operation of the generator of 16 pulses, stopping the transmission of information pulses from the buffer register 22.

The signal from the delay element also arrives at the input of the one-shot 21, which produces a single pulse (strobe), which enters the input of the resolution of the right recording of the counter 18. As the input of the parallel recording of the counter 18 is connected to the output of the register 17, then the counter 18 is written to zero information, i.e. the counter is reset. The signal from the zero reset trigger input 25 is removed.

The delay element 20 serves to provide the required duration of the last shift pulse arriving at the shift input of the buffer register 22, and to provide the necessary

five

0

DYM duration igatulse supplied to the counting input of the counter 8, for its proper operation.

The maximum number of bits in the transmitted and received words is determined by the state of the outputs of counters 8 and 18, which is decoded by decoders 9 and 19 and can be changed by designing the circuit of the proposed device by changing the decoders to decode the required state of counters 8 and 18 corresponding to the maximum value format of received or transmitted words.

In order to output information from the proposed device with a word format smaller than the maximum device format, the subscriber writes a number to register 17 along information path 26, the value of which, depending on the format of the word output by the device, is determined by the ratio

TO

per

 KM tre5

)

(one)

0

five

0

five

where k

per

number written to

register; KM - maximum amount

bit in the format of the word being spelled; To rfiid required number of bits

in the output format. After writing to register 17, the subscriber writes information to the buffer register 22, as a result of which, as described above, the word with the maximum value of bits is output from the device proposed, and the strobe produced by the one-shot 21 is output to the counter 18 from register 17 its contents. With the next entry in the buffer register 22 of the proposed device. Words with a number of bits equal to

TO

Tpes

 yu reg

(2)

50

55

since at the end of each output from register 17, counter 18 is rewritten, with the number Kpgr.

The first word issued to the communication channel from the device is not analyzed in the control object (it can be issued before the control object is turned on).

To receive information by a device with a word format smaller than the maximum received word format,

5.1

The subscriber writes in information path 26 to register 7 a number, the value of which, depending on the required format of the word received by the device, is determined by relation (1).

After receiving several words from the site control (before filling the counter 8), the information of which is not analyzed by the subscriber, one vibrator 11 is scooped, and by the gate it produces, the contents of register 7 are rewritten into the counter 8, the subsequent operation of the device for receiving information is performed as follows as described above, and the number of bits in the received words is determined by the relation (2).

Thus, the proposed device, after its preliminary programming, allows you to receive and transmit words of a rasta format: from 1 bit format to 32 bit format.

The bit size of registers 7 and 17. corresponds to the bit size of counters 8 and 18. The number of bits in buffer registers 5 and 22 corresponds to the maximum number in the transmitted words of the proposed device.

In the case of transferring a word with a format less than the maximum, the subscriber places the information in the corresponding bits of the buffer register 22 so that its shift from the buffer register 22 does not distort the word written into it. When reading the information received in the buffer register 5, the format of which is less than the maximum, the subscriber analyzes only the corresponding part of the buffer register 5.

Claims (1)

Formula from () reteni A device for interfacing a subscriber with a communication channel, comprising a receiver, a transmitter, an amplifier, a modulator, a demodulator, a key, two buffer registers, the first: a trigger, a pulse generator, the information input of the receiver and the information output of the transmitter are input and output of the device respectively, connected to the output and the input of the communication channel, the output of the first buffer register is the output of the device Q 0 five to connect to the subscriber's information input, while the receiver's information output is connected to the amplifier input, the output of which is connected to the input of a demodulator, the output of which is connected to the information input of the first buffer register, the information output of the second buffer register is connected to the input of the modulator whose output is connected with the input of the transmitter, characterized by the fact that, in order to expand the functionality by ensuring control of the format of the received and transmitted words, the second trigger., two registers, two counters, two decoders, two one-shot, two delay elements, the output of the first trigger connected to the control input of the key and is the output of the device for connecting to the subscriber readiness input, the zero input of the first trigger and the second trigger are the inputs of the device for connecting to the output of the sign of the end of the reading and the output of the sign of recording the information of the subscriber, respectively, The Q information input of the second buffer register is connected to the information inputs of the first and second registers and is the device input for connecting to the information output of the subscriber, while the information output of the first register is connected to the information input of the counter, the group of bit outputs of which is connected to the input decoder of the first decoder. whose output is connected to the input of the first delay element, the output of which is connected to the single input of the first trigger and to the input of the first one-shot, the output to The first is connected to the recording input of the first counter, the counting input of which is connected to the output of the key, the output of the second trigger is connected to the enable input of a pulse generator, the output of which is connected to the shift input of the second buffer register and the counting input of the second counter, the group of discharge outputs of which connected to a group of inputs of the second decoder, the output of which is connected to the input of the second delay element, the output of which is connected to the zero input of the second trigger and to the input of the second one-oscillator, the output of which g five 0 five 0 five the input of the record of the second counter, the information input of which is connected Editor E. Papp Compiled by S. Pestmal Tehred M. Didyk Proofreader N. King 4224/40 Circulation 672 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 with information output of the second register.