SU1132283A1 - Interface for linking subscribers with computer - Google Patents

Abstract

1. DEVICE FOR CONNECTING SUBSCRIBERS WITH ELECTRONIC COMPUTER MACHINE, containing a communication unit with an electronic computer, including a receiving optocoupler, three triggers, the element NOT, the first And element and the counter, and M of communication units with the subscriber, each of which consists of the receiving and transmitting optocouplers, two NAND elements, a delay element, an OR element, and four flip-flops, and in the communication unit with an electronic computer, the set and reset inputs of the first trigger are respectively set and reset inputs and the interrupt enable signal, the reset input and the forward output of the second trigger are respectively the input of the acknowledgment signal and the output of the subscriber number code transmission warning signal, the clock input and the output of the third trigger are connected respectively to the output of the element NOT and the first input of the first element I, the output connected to the synchronizing input of the counter, the first input of the receiving optocoupler is connected via a load resistor to the positive potential power supply bus, and in the i-th communication unit with th. ((-1, ЛЛ) the first inputs of the transmitting and receiving optocouplers are connected respectively via the first and second load resistors to the positive potential power supply bus; the clock input of the first trigger is connected to the -th input of the device communication request; the outputs of the second trigger and the OR element are connected respectively to the synchronization and installation inputs of the third trigger, the output of the first delay element is connected to the first input of the first AND-NOT element, the second input of the transmitting rptron is connected via a communication line With the first output of the receiving optocoupler (il) -ro of the communication unit with the subscriber, WITH the second input of the transmitting oriTpojja of the first communication unit with the subscriber is connected to the first output of the receiving optocoupler of the unit. The connection with the electronic computing machine, characterized in that interrupt response time, the second element AND, the pulse generator, the OR element and the shift register are entered into the communication unit with the electronic computer, and the second delay element, the switched delay element and the generator code are entered into each communication unit with the subscriber , Wherein a communication unit with an electronic computing machine receiving the second output of the optocoupler and the output of the first flip-flop podklyucheyy respectively to first and second inputs of the second AND gate, the output to the synchronization soedineniypo vhodomvtorogo latch and shift register data input, a reset input and a clock input which are connected

Description

respectively, to the device acknowledgment input and the output of the counter, the output group and the low-order output of the shift register are respectively the output group of the subscriber number code and the output of the subscriber number code readout, the information input and the inverse output of the second trigger are respectively the first input of the OR element, the second input of which is connected to the low-order output of the shift register, and the output to the reset inputs of the counter and the third trigger, and formation input connected to the direct output of the second trigger, the output of the pulse generator is connected to the input element and the second input of the first element AND, in the i-th communication unit with the subscriber the second output of the receiving optocoupler connected to the first input of the OR element and through the second delay element to the first input of the second element IS-NOT, the outputs of the first and second elements AND-NOT are connected to the first input of the transmitting optocoupler, the first output of which is connected to the zero potential bus, the second inputs of the first and second elements AND-NOT are connected to Respectively with inverse and direct outputs of the fourth trigger, the synchronization input of which is connected to the third trigger trigger, and the information input - with the input of the first delay element, the second input of the OR element and exit the code generator, the input connected to the output of the third AND-NOT element, the first and the second inputs of which are connected respectively to the outputs of the first trigger and the switching delay element, the input group of which is the i-th group of device priority setting inputs, and the input is connected to the output

32283

the second trigger, the synchronization input and the reset input of which are respectively the i-th inputs of the enable and disable signals of the communication unit with the device subscriber; the information inputs of the second and third triggers are connected to the positive potential power supply bus; the second output of the transmitting optocoupler is connected to the zero bus power supply source potential (i-1) -ro of a communication unit with a subscriber; the second output of the transmitting optocoupler of the first communication unit with the subscriber is connected to the zero bus potential of the power source of the communication unit; with electronic computers. I.

2. Device POP.1, different.

You also have the fact that the code generator of the communication unit with the subscriber contains a pulse generator, a trigger, a shift register, a switch block, an NOT element, and a group of isolation resistors, the output of the pulse generator connected to the first input of the AND element and through the NOT element trigger input, information input connected to the bus positive power source potential, output to the second input of the And element, and reset input to the input of the code generator, input of the switch block and the first group of installation inputs A second register, information input and the second group of installation inputs are connected respectively to the bus of the zero potential of the power source, the synchronizing input and the B1 input respectively to the output of the AND element and the output of the code generator, and a third group of the installation inputs to the group of outputs of the switch block and through the corresponding bus-wiring resistors with zero potential of the power supply.

The invention relates to computing technology and can be used to connect large remote peripherals to an electronic computer.

(COMPUTER) using a two-wire communication line both for transmitting interrupt requests to the computer, and for priority selection of one of the competing devices.

A device for interfacing subscribers with a computer is known, comprising a computer communication unit and a group of communication units with subscribers, interconnected by a two-wire communication line, the computer communication unit comprising a current generator transmitting and receiving optocouplers, the first and the second triggers, the first and second elements AND-NOT, the first element NOT the first delay element and the load resistor, the output of the current generator through the output transistor of the transmitting optocoupler is connected to the first wire of the two-wire communication line, the second wire of the two-wire communication line receiving through the LED of the optocoupler to a bus line of the power supply, the output of the receiving photocoupler

through the first element is NOT connected to the first input of the first NAND element, the second input of which is connected to the output of the first trigger, and the communication unit with the subscriber contains the receiving and transmitting optocouplers, three triggers, two NO elements, the OR element, the NAND element, a delay element and a load resistor; the output transistor of the first transmitting optocoupler is connected between the first and second wires of the two-wire communication line.

In the course of operation of the device, communication units with subscribers send interrupt request signals to the communication line, B. The response of the communication unit with a computer generates a response signal on the same communication line, which causes activation of a single (highest priority) communication unit with a subscriber from among those requiring service. After that, the computer on the information channel issues the Who You Are command and, in response to the same channel, the subscriber number, which is used to go to the corresponding service subroutine lj.

The drawback of the device is the low throughput due to the need to programmatically call the subscriber number and, consequently, due to the loss of time when responding to an interrupt.

The closest to the proposed technical entity is a device for interfacing subscribers with a computer, which contains a communication unit with a computer and M communication units with a subscriber, with the first input and output of the communication unit with a computer, respectively, connected to the PERV1M output and input the first communication unit with the subscriber, the first input and output of each communication unit with the subscriber are connected respectively with the second output and the input of the previous communication unit with the subscriber, the second, third and fourth inputs, the second and third outputs of the and communication with the computing machine are sodtvetstvenno inputs setting signals and Throw, ca enable interrupts, handshake input devices, output code readiness subscriber number and output the warning

the subscriber number code transmission signal, the group of information outputs of the communication unit with the machine is a group of outputs for transmitting the subscriber number code to the machine, the third input

The causode of the communication unit with the subscriber is the corresponding input of the communication request of the device, and the communication unit with the computing machine contains a transmitting and receiving optocouplers, three

a delay element, a load resistor, three triggers, three NAND elements, an AND element, two NOT elements, a counter and a current generator, and each communication unit with a subscriber is a receiving

and two transmitting optocouplers, four triggers, two load resistors, a pulse shaper, an OR element, a delay element, three NOT elements and an NAND element, and in the communication unit with

by the computer, the first input of the receiving optocoupler is connected to the first input of the unit, and the second input is connected to the negative polarity bus of the power source, the output of the receiving

The optocoupler is connected to the first input of the first NAND element, the second and third inputs and the output of which are connected respectively to the outputs of the first and second triggers and through the AND element

with the synchronizing input of the counter, the second, third and fourth inputs of the block are connected to the installation and reset inputs of the third, 6 flip-flops and the reset input of the second flip-flop, the group of information outputs of the block is connected to the outputs of the counter, the output of the second flip-flop is connected to the third output of the block, in each block - connection with the subscriber, the first input and output are connected respectively to the first outputs of the receiving and first transmitting optocouplers; the first input of the second transmitting optocoupler through the first load resistor is connected to the positive field bus p The power supply source, the second input through the first element NOT with the output of the first trigger, the output of the receiving optocoupler is connected to the second input of the unit, the second input of the receiving optocoupler through the second load resistor is connected to the positive polarity bus of the power supply, the synchronizing input of the second trigger is connected to the third input block, and the output - with the first input of the first element OR, the output of which is connected to the input of the third trigger. When this device is in operation, requests for communication with computers coming from subscribers fold OR on a common two-wire line. In response to receiving a generalized request signal, the communication unit with a computer temporarily opens the current loop and then receives from one of the units zi with the subscriber a series of pulses, the number of which is equal to the subscriber number If there are competing requests, the one that is transmitted by the subscriber unit located closer (according to the scheme) to the communication unit with the L2J computer is serviced. A disadvantage of the known device is the limited functionality that is associated with the rigidity of the priority structure, predetermined by the mutual arrangement of communication units with subscribers. The priorities of communication units with subscribers cannot be changed, which minimizes the need for servicing long-range requests. In addition, the response time to an interrupt is long, which is due to the fact that the method of transmitting the subscriber number is not perfect. As the number pa increases, the number of pulses in the series increases, and this leads to a loss of time and, consequently, an increase in the response time to an interruption. The device is also characterized by large hardware costs. The purpose of the invention is to reduce the response time to an interrupt, expand the functionality of the device and reduce hardware costs. The goal is achieved by the fact that the device containing a communication unit with an electronic computer, including a receiving optron, three triggers, is NOT the first AND element and the counter, and M communication units with the subscriber, each of which consists of a receiving and transmitting optocouplers, two AND-NOT elements, a delay element, an OR element and four triggers, and in the communication unit with electronic The card set and reset inputs of the first trigger are respectively the set-up and reset inputs of the-, interrupt solution, the reset input and the direct output of the second trigger are respectively the input of the acknowledgment signal and the output of the subscriber number code warning signal, the clock input and the output of the third trigger are connected respectively to the output of the element NOT and the first input of the first element I, the output connected to the synchronizing input of the counter, the first input of the receiving optocoupler with dinene through a load resistor with a positive potential power supply bus, and in the i-th communication unit with the subscriber (, M), the first inputs of the transmitting and receiving optocouplers are connected respectively through the first and second load resistors to the positive potential source power line the trigger is connected to the i-th input of the device communication request, the outputs of the second trigger and the OR element are connected respectively to the synchronization and installation inputs of the third trigger, the output of the first element is delays ki is connected to the first input of the first NAND element, the second input of the transmitting optocoupler is connected via a communication line with the first output of the receiving optocoupler with (1-1) -th communication unit with the subscriber, the second input of the transmitting optocoupler of the first communication unit with the subscriber with the first output of the receiving optocoupler of the communication unit with the electronic computer, the second element I, the pulse generator, the element is introduced into the communication unit with the electronic computer machine. NLI and shift register, and in each communication unit with the subscriber there is a second delay element, a switched delay element and a code generator, with the second output of the receiving optocoupler and the output of the first trigger in the communication unit with the electronic computer being connected to the first and second inputs of the second element And, the output connected to the synchronization input of the second trigger and the information input of the shift register, input reset and sync input

which are connected respectively to the input of the device handshake signal and the output of the counter, the group of outputs and the low-order output of the shift register are respectively the group of outputs of the subscriber number code and the readiness output of the number code. the subscriber, the information input and the inverse output of the second trigger are connected respectively to the bus of the positive potential of the power source and the first input of the OR element, the second input of which is connected to the low-voltage output of the shift register and the output to the reset inputs of the counter and the third trigger, information input connected to direct output of the second trigger, the output of the pulse generator is connected to the input of the element NOT and the second input of the first element I, in the IM unit of communication with the subscriber the second output of the receiving optocoupler connected the first input element OR and through the second delay element to the first input of the second element AND-NOT, the outputs of the first and second elements AND-NOT are connected to the first input of the transmitting optocoupler, the first output of which is connected to the zero potential bus, the second inputs of the first and second elements AND- They are NOT connected respectively to the inverse and direct outputs of the fourth trigger, the synchronizing input of which is connected to the output of the third trigger, and the information input to the input of the first delay element, the second input of the OR element, and the output of the generator code, the input connected to the output of the third element IS-NOT, the first and second inputs of which are connected respectively to the outputs of the first trigger and co-adjustable delay element, the input group of which is the i-th group of device priority setting inputs, and the input is connected to the output of the second trigger which sync input and reset input

are, respectively, the i-th inputs of the enable and disable signals of the communication unit with the subscriber of the device, the information inputs of the second and third triggers are connected to the positive potential source power supply bus i the second output of the transmitting

the optocoupler is connected to the zero bus, 1 - -

power source potential (i-l) -r

the communication unit with the subscriber, the second output of the transmitting optocoupler of the first communication unit with the subscriber is connected to the bus of zero potential of the power source of the communication unit with the electronic computer.

In addition, the code generator of the communication unit with the subscriber contains a pulse generator, a trigger, a shift register, a switch block, a NOT element, and a group of isolation resistors, with the output of the pulse generator connected to the first input of the AND element and through the NOT element to the trigger input, information input connected to the bus positive potential of the power source, the output to the second input of the element And, and the reset input to the input of the code generator, the input of the switch block and the first group of setup inputs of the shift shift Istra, information input and the second group of installation inputs of which are connected respectively to the zero potential bus of the power supply source, the synchronizing input and output respectively to the output of the And element and the output of the code generator, and the third group of the installation inputs to the group of outputs of the switch block and through the corresponding resistors Lines of the group to the bus of the zero potential of the power source, p. FIG. 1 is a block diagram of the proposed device; in Fig. 2 is a functional diagram of a communication unit with a computer; in Fig. 3 is a functional diagram of a communication unit with a subscriber; Fig. 4 is a functional diagram of a code generator; Fig.5 is a functional diagram of the programmable delay element; figure 6 - timing diagram of the device.

A device for interfacing subscribers with a computer (Fig. 1) contains a communication unit 1 with a computer and M communication units .2 with a subscriber (only three blocks 2 are shown in Fig. 1), Blocks 1 and 2 are interconnected two-wire communication lines 3 comprising the first 4 and second 5 tires.

Fig. 1 shows the inputs 6 and 7 of the setup and reset interrupt enable signals and the device acknowledgment signal input 8, the ready number 9 subscriber number code 9 and the subscriber number code 10 warning signal output 10, group 11 of the subscriber number code inputs, inputs 12 of the 9113 device connections, reset inputs 13 for clearing, inputs 14 and 15 of the enable and disable signals of the blocks 2 and the group of inputs 16 for setting the priority of each block 2. The block 1 of communication with the computer (figure 2) contains triggers 17 , 18 and 19, the second and first elements And 20 and 2 1, load resistor 22, receiving optocoupler 23, pulse generator 24, NOT element 25, counter 26, shift register 27 and element 28, bus 29 of the positive potential of the power source, bus 30 of the zero potential of the power source, bus 31 of the positive potential of the power source . The communication unit 2 with the subscriber (FIG. 3) contains a receiving optocoupler 32, a transmitting optocoupler 33, load resistors. 34 and 35, triggers 36, 37, 38 and. 39, the third, second and first elements AND-NOT 40, 41 and 42, the generator 43, the switching element 44, the delay element, the element OR 45 and the elements 46 and. 47 delays, zero potential source potential bus 48, power source positive potential bus 49, output 50 and input 51 of the programmable delay element 44, input 52 and output 53 of code generator 43, positive power source potential bus 54 and zero potential source bus 55 inputs 56 and 57 of trigger 37. The outputs of the NAND elements 41 and 42 of the open collector type are connected and connected to the combining point of the input of the optocoupler 33 and resistor 34, Code generator 43 (FIG. 4) contains pulse generator 58, HE element 5 trigger 60, element and 61, shift Marketing register 62 with bits of 63-69, resistors 70 and band decoupling unit 71 switches comprising switch gear 72-76. The inputs of the installation and reset bits 63-67 are connected via resistors 70 to the bus 48 and to the outputs of the corresponding two-position switches 72-76. Switching delay element 44 (figure 5) contains bus 77, delay elements 78, 79 and 80, multiplexers 81, 82 and 83, buses 84, 85 and 86. Figure 6 shows timing diagrams explaining the operation of the Plot B7 device. displays the signal at the output of the optocoupler 23, plot 88 - the signal at the output of the trigger 18, plot 89 - the signal at the input of the counter 26, plot 90 - the signal at the output of the counter 26, plot 91 - readiness of the code, remove the MBDi from output 9 of block 1, plot 92 signal reset, coming from the computer to the input 8. The positions 93-100 denote fragments of these diagrams. The device works as follows. The device is designed to notify the computer that one of the subscribers (in the presence of conflicts is the most priority) requires service, and the number of this subscriber is automatically, i.e. without the fate of the computer, is transmitted from the corresponding block 2 via the communication line 3 to the resistor 27. The computer reads this number and uses it to go to the service routine of the corresponding subscriber. The signal from output 10 of block 1 warns the computer that there is at least one service request in the outside world, and the subscriber’s number on link 3 will soon be transferred to the shift register 27. If the transmission rate of signals on line 3 is high, and The computer has low performance, it can use the signal from output 10 as an interrupt signal. In this case, the transition process to the interrupting program (storing the return parameters in the stack memory, setting a new program state word, etc.) and accumulating Yeni information in the shift register 27, will take place in parallel to the time of the survey it will be already completed the formation of the code number of the subscriber. If the transmission rate of signals on line 3 is low (e.g., 50 baud), and the computer has high performance (e.g., 500 thousand operations per second), then the warning signal from output 10 is too premature and therefore is not used (to avoid losses machine time to wait for the transfer of the subscriber number on line 3 to the shift register 27). In this case, the interrupt signal can be the positive edge of the signal from output 9, which signals that the accumulation of code in the shift register 27 is completed. If the ratio of the transmission rate of signals on line 3 and the performance of a computer is such that the transition time to the interrupting program is commensurate with the accumulation time of the code in shift register 27, then the interruption can be triggered by the signal from output 10, and the signal from output 9 can serve as an indicator of code readiness in the shift register 27 and cyclically painted in the interrupt program itself at the initial stage of its execution. Upon detecting a sign of readiness, the interrupt program makes the transfer of control to the appropriate branch, using the code read from the shift register 27 as the branch address. Responses to interrogation signals from subscribers to inputs 12 can be disabled or allowed both at the level of individual subscriber units 2 by resetting or setting the triggers 37 at inputs 15 and 14, and at the device level as a whole by controlling trigger 17 at inputs 7 and 6 The device performs the function of selecting the highest priority subscriber from among those requiring service. When priorities may; depending on the codes at the inputs of 16 blocks 2, and for identical codes, depending on the physical position of the block. By. as block 1 moves away from block 2, their priority (in the group with identical codes at inputs 16) decreases the subscriber number code — the winner in the priority competition is transferred to the shift register 27 without loss of computer time. The communication unit 1 is designed to provide interfacing between the computer and the two-wire communication line 3. In the initial state, the interrupt enable trigger 17 is set to a single position at the expense of the previously received pulse at input 6. The triggers 18 and 19, the counter 26 and the shift register 27 are reset at the expense of the previously received pulse at input 6. In the absence of current interrupt requests bus 29 flows through a resistor 22, an optocoupler 23 LED, goes to wire 4 of line 3 and, returning via wire 5, flows onto a bar 30, the line power supply (bus 30 and 29) is galvanically coupled to the power supply of logic elements of block 1 the purpose of increasing the noise immunity awes Since the LED of the optocoupler 23 is turned on, a logical O is formed at the output of the optocoupler, and the element 20 is closed. The pulses from generator 24 do not pass through the closed element I 21. Logical O are formed at outputs 11, 9, and 10. This state of unit 1 is maintained until such time as one or several service requests appear. As a result of their priority interaction, the strongest request causes the sending of a telegraphic code along line 3, which is schematically displayed on plot 87 (Fig. 6). The code dressing, as usual, contains a start bit 93 and a group of information bits 94-98, which display the number of the entered subscriber unit (bit 94 corresponds to the digit of the digit, bit 98 most significant). The duration of the starting and information pulses depends on the received information rate on line 3 and is maintained with high accuracy due to the use of quartz oscillators 58 in blocks 2 when forming the center of a quartz oscillator 24 when it is decrypted. Pulse 93, caused by the cessation of current through the LED of the optocoupler 23, passes through the element 20 and the leading edge sets the trigger 18 to the one state, since logical 1 is fed to its information input (plot 88). After that, in the pause between the pulses, the generator 24 is set to 1 flip-flop 19 and then a series of pulses 89, starting with a full-fledged pulse a, is fed to the synchronizing input of the counter 26, causing its periodic overflow (plot 90). The pulses from the overflow output of the counter with positive fronts cause reception of the pad in the shift register 27. At time 99, the start bit reaches output 9, the count is suspended, trigger 19 and counter 26 are reset. When the pulse 100 is received (plot 92) at input 8, the signals from outputs 9 (plot 91) and 10 (test 88) are removed, logical O is set at outputs 11, unit 1 comes to its original state.

The communication unit 2 with the subscriber works in the following way.

Upon receipt of the code dressing permission signal at input 14, trigger 37 is activated, as a result of which trigger 38 is zeroed and programmed delay element 44 is triggered, controlled by inputs 16 (Fig. 5). A signal from the output of element 44 interrogates the state of trigger 36 and, if the request is present, a code generator 43 is started (Fig. 4) and a telegraphic parcel is formed at its output.

In the absence of competing dressing from similar blocks located to the left (according to the scheme) of the one under consideration, triggers 38 and 39 are triggered, and the dressing is transmitted through delay element 46, the AND-NOT element 42 and optocoupler 33 to line 3 in the direction to block 1.

If the competing parcel has passed through the optocoupler 32, the OR 4 element and the triggers 38 and 39 before the signal arrives at the output 53 of the generator 43, then it passes uninterruptedly through this block 2, and the parcel from the generator 43 is lost. Thanks to delay elements 46 and 47, which compensate for delay. In the circuit element OR 45, the triggers 38 and 39 exclude races, i. the displacement of two parcels, in whatever temporal relation they are.

The subscriber service algorithm may be as follows.

1 "When an interrupt is received, the computer goes to the subscriber's service routine and bans sending requests by setting all 37 triggers to O at the same time.

blocks 2 (by sending the corresponding command simultaneously to all blocks 2 via the information channel).

2. Exchange with the selected subscriber.

3. The block is reset. one.

4. An individual reset is triggered by block 36 of block 2, which corresponds to the served subscriber.

5. The total resolution of the message is produced, i.e. installation in 1 triggers simultaneously in all blocks 2.

i After that, the cycle of operation of the devices is repeated: having; the triggers 36 interrogate and interact with each other (low priority requests are forcibly braked at the start by elements 44), the winner is found and the code of this block 2 dialed by the switches 71 is transmitted to the computer.

Thus, the device at a lower hardware cost provides the ability to manage the priorities of subscribers, i.e. arbitrary placement of different in importance subscribers in a serial circuit. With dynamic software re-. The construction of the priority structure eliminates the possibility of grossly displacing low-priority subscribers with high-priority subscribers, which allows the implementation of democratic service disciplines. This broadens the field of application of the device. In addition, the interrupt response time is reduced. To transmit, for example, code 40 in the prototype object, it is necessary to spend 40 clock cycles. In the proposed device, the same transmission is performed in 8 cycles.

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Claims (2)

1. A device for interfacing subscribers with an electronic computer, comprising a communication unit with an electronic computer, including a receiving optocoupler, three triggers, an element NOT, a first element AND and a counter, and M communication units with a subscriber, each of which consists of a receiving and transmitting optocouplers, two AND-NOT elements, a delay element, an OR element, and four triggers, and in the communication unit with the electronic computer, the installation and reset inputs of the first trigger are respectively the installation and reset inputs of the signal interrupt enable, reset input and direct output of the second trigger are respectively an acknowledgment signal input and an output signal of a subscriber number code warning signal, the synchronizing input and output of the third trigger are connected respectively to the output of the element NOT and the first input of the first element AND, the output connected to the synchronizing input counter, the first input of the receiving optocoupler is connected via a load resistor to the positive potential bus! power supply, and in the ΐ-th communication unit with the subscriber ("= 1, Л0, the first inputs of the transmitting and receiving optocouplers are connected respectively through the first and second load resistors to the bus of the positive potential of the power supply, the synchronizing input of the first trigger is connected to the 1st request input device communications, the outputs of the second trigger and the OR element are connected respectively to the synchronizing and installation inputs of the third trigger, the output of the first delay element is connected to the first input of the first element AND NOT, the second input is transmitted the rptron'a is connected via a communication line with _{Q to the} first output of the receiving optocoupler of the 1S (1-1) -th communication unit with the subscriber, the second input of the transmitting optocouple of the first communication unit with the subscriber is connected to the first output of the receiving optocoupler of the communication unit with the electronic computer, about Including the fact that, in order to reduce the response time to the interruption, a second AND element, a pulse generator, an OR element, and a shift register are introduced into the communication unit with the electronic computer, and each communication unit with the subscriber - the second element of the delay, com a removable delay element and a code generator, and in the communication unit with an electronic computer, the second output of the receiving optocoupler and the output of the first trigger are connected respectively to the first and second inputs of the second element And, the output connected to the synchronizing input of the second trigger and the information input of the shift register, the reset input and whose sync input is connected SU. „, 1132283 .1132283, respectively, to the input of the acknowledgment signal of the device and the output of the counter, the group of outputs and the output of the lower · bit of the shift register are respectively the group of outputs of the subscriber number code and the readiness output of the subscriber number code, the information input and the inverse output of the second trigger are connected respectively to the bus of the positive potential of the power source and the first input of the OR element, the second input of which is connected to the low-order output of the shift register, and the output to the counter reset inputs and the third of the trigger, the information input connected to the direct output of the second trigger, the output of the pulse generator is connected to the input of the element NOT and the second input of the first element And, in the i-th communication unit with the subscriber, the second output of the receiving optocoupler is connected to the first input of the OR element and through the second delay element to the first input of the second AND-NOT element, the outputs of the first and second AND-NOT elements are connected to the first input of the transmitting optocoupler, the first output of which is connected to the zero potential bus, the second inputs of the first and second AND-NOT elements inens, respectively, with the inverse and direct outputs of the fourth trigger, the synchronizing input of which is connected to the output of the third trigger, and the information input - with the input of the first delay element, the second input of the OR element and the output of the code generator, the input connected to the output of the third element AND, NOT, the first and the second inputs of which are connected respectively to the outputs of the first trigger and the switched delay element, the group of inputs of which is the i-th · Priority job input group.: · devices, and the input is connected to the output the second trigger, the synchronizing input and the reset input of which are respectively the i-inputs of the enable and disable signals of the communication unit with the device subscriber, the information inputs of the second and third triggers are connected to the bus of the positive potential of the power source, the second output of the transmitting optocoupler is connected to the bus of the zero potential of the source power supply (il) -ro of the communication unit with the subscriber electronic computer. I ⁷ 2. The device according to claim 1, characterized in that the code generator of the communication unit with the subscriber comprises a pulse generator, a trigger, a shift register, a switch block, an element NOT and a group of isolation resistors, the output of the pulse generator being connected to the first input of the element And and through the element NOT with a trigger trigger input, an information input connected to the bus of the positive potential of the power source, an output to the second input of the AND element, a reset input to the input of the code generator, the input of the switch block and the first group the shift input register inputs, the information input and the second group of installation inputs of which are connected respectively to the bus of the zero potential of the power source, the synchronizing input and output, respectively, to the output of the And element and the output of the code generator, and the third group of installation inputs to the group of outputs of the switch block and through corresponding isolation resistors to the bus of the zero potential power supply.