SU1434444A1 - Arrangement for interfacing subscribers with computer - Google Patents

Abstract

The invention relates to computing and can be used to organize communication of computer modules with computers in distributed control systems of technological equipment. The aim of the invention is to expand the functionality of the device by organizing bidirectional information exchange and interrupting the operation of a computer. The device contains M blocks of communication with subscribers, each of which contains the first and second blocks of transceivers 2.1, 2.2, switch 3, demultiplexer 4, switch block 5, element OR 6, element AND-HE 7, first and second triggers 8, 9, element 10. The device implements a distributed computing network of subscribers with the possibility of high-speed communication with a computer in bidirectional mode. 2 Il.

Description

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The invention relates to the field of computer technology and can be used to organize communication of computer modules with computers in distributed process control systems.

The aim of the invention is to improve the performance of the device.

FIG. 1 is a block diagram of the device; in fig. 2 is a diagram of a communication unit with a subscriber.

The device contains M blocks 1.1 - 1.M communication with the subscriber (see Fig. 1), each of which contains (see Fig. 2) the first, second blocks of transceivers 2.1, 2.2, switch 3, demultiplexer 4, block 5 of switches , the element OR 6, the element AND-NOT 7, the first, second triggers 8, 9, the element AND 10. In addition, in FIG. 2 are represented by subscriber 11 and computer 12.

The device works as follows.

In the initial state, the triggers 8 of all I blocks are in the zero state, therefore the triggers 9 are also in the zero state, providing the first operating mode of the switches 3, the zero level signal arrives at the interrupt request input (no system subscribers requiring service).

The device operates in two modes, depending on the logic signal at the control output of the computer 12: "Alert," Answer.

In the Alert mode, the control output of the computer 12 is in the state "O", which ensures the operation of all the units of the 2 transceivers in the first mode of operation. The device in this mode of operation is intended to notify the computer 12 that one of the subscribers (if there are contention leaders) requires service, and the subscriber’s number automatically, i.e. without the fate of the computer, it is transmitted from the corresponding block 1 of communication with the computer, as well as queuing subscribers from those requiring service. If it is necessary to organize a communication session between the subscriber 1 and the computer 12, the corresponding module sets the trigger 8 into one state. The elements OR 6, AND-NOT 7 and trigger 9 are intended for organizing a queue of servicing the requests of subscribers 11 for interrupted computer operations 12. The operation of this circuit is carried out in accordance with the truth table.

Let module 11 is the leader of the queue. The trigger 9 is in the "Select.K 1" state, the switch 3 is switched to the second mode of operation. Thus, the message from the subscriber 11 (the actual data) together with the sender's address (after the sender) goes to the information inputs of the computer 12, with this. "Interrupt request

. The computer 12 interrupts the operation, goes to the interrupt service routine, unambiguously identifies the source of the message by the address part of the message, and 5 processes the incoming information.

The transfer of information from the computer to the subscriber 11 who requested the exchange takes place in the “Answer. The control output of the computer 12 goes into one state,

 which ensures the transition of all blocks of 2 transceivers to the second mode of operation. Demultiplexers 4 of all communication units 1 are in the first mode of operation, and the multiplexer 4 of the communication unit requesting the exchange, in the second. One line in the IC5 formation group is used to synchronize the transmitted information. The computer 12 transmits to the subscriber 11 a message containing the number of transmitted bytes, according to which the counter of the received information is set in the subscriber P (not shown). Next, the information is transferred from the computer 2 to the subscriber 11, the counter of the received information is reset, and the device for connecting the subscribers to the computer is switched to the Alert mode.

5 Subscriber 11 either resets trigger 8, or can transmit the following information message to computer 12.

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Claims (1)

Invention Formula A device for interfacing an e-computer subscriber containing a group of communication units with a subscriber, the set and reset inputs and the information input and output of the i-ro (i Cw) of the communication unit with the subscriber are connected respectively to the inputs of the device for connecting the outputs of the set, reset, information output of the i-ro subscriber and with the output of the device for connecting the information input of the i-ro subscriber, inputs the transmission direction settings of all communication units with the subscriber are interconnected and with the device input for connecting the control output of the computer, the first information input-output, the interrupt request input input, the second information input-output and the interrupt request output of the i-ro block connection with the subscriber (, l}) are connected respectively with the second information input-to (- the progress and output of the interrupt request (1-) communication unit with the subscriber and to the first information input-output and the input interrupt request (g +1) of the communication unit with the subscriber, the second information Ion input-output and the interrupt request output unit of the first communication with the subscriber are respectively connected to the input-output device for connecting the data input-output computer and access device for connecting the interrupt request input EV.M, wherein each subscriber communication unit contains a first, second triggers, an OR element, an NAND element and a switch block, characterized in that, in order to improve performance, a first, second transceiver unit, a switch, is inserted into each communication unit with a subscriber, the demultiplexer and the element I, and in each communication unit with the subscriber, the input of the transmission direction of the communication unit with the subscriber is connected to the control inputs of the first and second transceiver units, the first, second informational inputs-outputs of the communication unit with the subscriber the volume is connected respectively to the informational inputs-outputs of the first and second transceiver units, the interrupt request input of the communication unit with the subscriber is connected to the first inputs of the OR and NAND elements, the second inputs of which, the zero input of the first trigger and the first input of the AND element are connected to the output of the second trigger, zero and single inputs of which are connected to the inputs installation and reset unit, the output element OR is connected to the output of the interrupt request request of the communication unit with the subscriber, the first, second, third information inputs of the switch are connected respectively to the information output of the first transceiver unit, to the information input of the communication unit with the subscriber and to the output of the switch block, the output of the I-ME element is connected to the single input of the first trigger, the output of which is connected to the control input of the switch and to the second input of the And element whose output is connected to the control input of the demultiplier The lexor, the information input and the first, second information outputs of which are connected respectively to the information output of the second transceiver unit, to the information input of the first transceiver unit and to the information output of the communication unit with the subscriber, the output of the switch are connected to the information input of the second transceiver unit. Expelling dbm