SU993238A1 - Two-channel interfacing device - Google Patents

Description

The invention relates to computing, in particular, to user interface devices in a ring structure system, and can be used to control the direction of transmission of a unipolar code to any of the subscribers of the ring system.

A pairing device is known which contains a central subscriber connected to peripheral subscribers by a collective bus closed in a ring with a branch to peripheral subscribers tl

The disadvantages of the known device are the lack of interconnection between subscribers in case of link failures (bus interruption or short circuit) and a large number of tires.

The closest to the proposed technical essence and the achieved result is a two-channel interface device containing a transmitter, a receiver and a switch in each channel, with the transmitter output of one channel and the receiver input and the coherent channel connected to the first input-output switch of one of the channels, the second The input-output of the commutator of one channel is connected to the second.

Another input-output switch of another channel, controlling the inputs of the channel switches are connected to the blocking input of the device, the third input output of the channel switch is the corresponding information input-output device l2J.

The disadvantage of the device is that it. does not allow to keep about 10 subscribers between each other in case of failures, on any part of the ring line, i.e. possesses low reliability.

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The purpose of the invention is to increase reliability.

The goal is achieved by the fact that in a two-channel interface, containing in each channel

20 transmitter, receiver and switch, with the transmitter output of the first (second) channel and the receiver input of the second (first) channel connected to the first input-output of the switch 25 of the first (second) channel, the second

the input-output switch of the first channel is connected to the second input-output of the switch of the second channel; the control inputs of the channel switches are connected to the blocking input of the device; the third input-output of the channel switch is the corresponding input-output device; a pause analyzer is entered, trigger, element OR codes, element OR syncro. signals as well. each channel consists of five AND elements, two OR elements and a trigger, with a single output of channel trigger connected to the first inputs of the first and second channel AND elements, the second inputs of the first and second channel AND elements are connected respectively to the first and second outputs of the channel receiver , the output of the first element AND channel is connected to the first input of the first element OR channel, the output of the second element AND channel soy: dinene to the first input of the second element OR channel, the outputs of the first and second elements OR channel are connected respectively to the first and torym inputs .kanala transmitter, the transmitter output of one channel and the other channel receiver input connected to a second input-output switch .From one channel, a second channel receiver output is connected to a first input of the third AND gate channel, the zero output of flip-flop Canada are. la connected to the second input of the third element And another channel, the third inputs of the third elements And channels connected to the device enable input, the output of the third element And channel connected to a single channel trigger input, zero inputs of channel triggers connected to the pause analyzer output, the second outputs of receivers channels through the element OR sync signals are connected to the first input of the pause analyzer, the second input of which is connected to the first waste BXO; Device house, the outputs of the first elements AND channels through the element OR codes with dinene with information output device, the outputs of the first elements of the first and second channels are connected respectively to the unit and zero inputs of the device trigger, the first inputs of the fourth and fifth elements of the channel are connected to the corresponding information input of the device, the installation and second reset inputs of the devices are connected respectively to the unit one and zero inputs of the device trigger, single output of the device trigger, connected to the second inputs of the fourth elements of the I. channels, zero output of the device trigger The properties are connected to the second inputs of the fed elements and channels, the outputs of the fourth elements AND of the first and second channels are connected respectively to the second inputs of the first and second elements OR of the second channel, and the outputs of the fifth elements - AND the first and second channels are connected respectively to the second inputs of the first and the second element OR of the first channel. The pause analyzer is designed as a counter, the counting and zeroing inputs and output of which are connected respectively to the first, second inputs and the output of the pause analyzer. The drawing shows a block diagram of the interface device. The interface device contains channels 1 and 2, each of which contains the first element AND 3, the first element OR 4, the transmitter 5, the commutator, the receiver 7, the second element AND 8, the second element OR 9, the trigger 10, the third element And 11, fourth 12 and fifth 13 elements I. In addition, the device contains an element OR 14 codes, an element OR 15 clock signals, a pause analyzer (counter) 16, a trigger 17. The following symbols are accepted: an interface device 18 connected to the subscriber 19, a similar device 20 mates with the subscriber 21 and the device 22 mates with a subscriber volume 23. In addition, the device contains a blocking input 24, razrita entrance 25, the first 26 and 27 second information inputs, the setup input 28, the first 29 and the second 30 reset inputs, inputs-outputs 31 and 32, information output 33. The device operates as follows in a way. In the initial state, with all subscribers in the system, the switches b of the devices 18, .20 and 22 connect the external sections of the communication line to the inputs of all receivers 7 and the outputs of the transmitters 5. Triggers direction-. The transfer rate (TNP) 10 of all devices 18, 20 and 22 is reset, prohibiting the transmission of information from the receiver to transmitter 5 of channel 1 and, conversely, from receiver 7 to transmitter 5 of channel 2. Suppose subscriber 19 is central and controls the exchange in system. The remaining subscribers 21 and 23 are peripheral and exchange with the central subscriber 19 and among themselves at the commands of the central subscriber 19. Suppose the subscriber 19 organizes the transmission of information to the right. At the same time, it outputs to the input 25 prohibiting the elements 11 and the other subscribers of the system do not form such a ban), sets the input 30 to the zero state trigger response direction 17 (the other subscribers to the corresponding specified triggers have an effect) and begins to input 27 sequential unipolar code followed by a sync packet from input 26 of the device. The output code and sync order, respectively, through the elements And 13

channels 1 and 2 and elements OR 4 and 9 of channel 1 to transmitter 5. At the output of transmitter 5, an output code is generated, which through switch b is output to input-output 31.

The information reaches the interface device 22 and passes through the corresponding switch 6 to the input of the corresponding receiver 7. At the first output of the receiver 7, a unipolar code is allocated, at the second output of the sync packet (Fig. 2). The sync signal from the second output of the receiver 7 through the element AND 11 channel A 1 cocks the trigger 10 of channel 1 of the device 22, simultaneously dropping the analyzer 16 pause through the element OR 15 clock signals. Synchro pulses zeroed counter 46, preventing the input frequency from being counted to the end. . h

Trigger channel 10 trigger 10. allows unipolar code and sync packet from receiver 7 of channel 1 to pass through the emitters AND 3 and 8 and elements OR 4 and 9 of channel 1 to the input of transmitter 5, simultaneously with a signal from the zero output of the bar, cocking the trigger of channel 2. Occurs capturing interface device 22 for transmitting information through it from receiver 7 to channel transmitter 5

I.Return from receiver

7 to transmitter 5 of channel 2 is prohibited by the zero state of trigger 10 of channel 2,.

The information from the output of the AND element 3 of the channel 4 of the interface 22 introduces a trigger. 17 (determines the direction of the possible answer) and through the element OR 14 is received by the subscriber 23. Thus, the information is transmitted through the conjugator 22 and perceived by the subscriber 23.

A similar process takes place in the remaining system interfaces until the signal again reaches the interface device 18. Here his pass-through translation is forbidden, since the triggers of 10 channels 1 and 2 of this device cannot be locked due to the prohibiting signal from input 25 from subscriber 19. After the transfer is completed, the analyzers 16 pauses into all interface devices, the system resets the corresponding triggers. Hera 10, deflecting the interconnection of subscribers, the Subscriber, having determined that the message is addressed to him, responds with information in the direction from which he received it. This is ensured by the state of the corresponding trigger 17 after reception. In this case, the answering subscriber issues a prohibition signal to the corresponding elements at the device input 25.

II, and the other subscribers do not issue such a signal. Central subscriber

at this time, it functions like all the others and also transmits via itself response signals, which is necessary when exchanging peripheral subscribers with each other ..

If any part of the communication line fails, the operability of the system is preserved if there is a failure of the communication link portion between the devices. is 22 mates (open, 0 short to ground, constant low or high voltage due to a transmitter failure), central subscriber, sending information to the right and not receiving a reply. one, cocks the trigger 17 and repeats

5 transfer information to the left. The interface devices, starting from the 20th, broadcast the message to the interface device 22 via serviceable lines of communication. Subscriber 23 responds to the central subscriber through the interface device preceding the device 20, and the system is still working; injured. This is provided by a combination of all the nodes and connections entered.

5 in between.

If a subscriber is disconnected or withdrawn from the system, then the corresponding switches, due to the absence of a control signal, close the line, shunt a section of the disconnected or disconnected subscriber, and the system remains operable to exchange in any direction.

Thus, in the proposed

5, the invention provides an exchange between subscribers in the event of a failure of any section of the communication line or the disconnection or withdrawal of any subscriber from system j.

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Claims (2)

1. A two-channel interface device 5, containing in each channel a transmitter, receiver and switch, with the transmitter output of the first (second) channel and the receiver input of the second (first) link connected 0 with the first input-output switch of the first (second) switch, the second input-output of the switch of the first channel is connected to the second input-output of the switch of the second channel, the control inputs of the channel switches are connected to the blocking input of the device, the third input-output of the channel switch is Appropriate, input-output indication of the device, characterized in that, with In order to increase reliability, it contains a pause analyzer, a trigger, an element of OR codes, an element of sync signals, and each channel contains five AND elements, two OR elements and a trigger, with a single channel trigger output connected to the first inputs of the first and second channel AND elements the second inputs of the first and second elements of the channel are connected respectively to the first and second outputs of the receiver, the output of the first element of the channel is connected to the first input of the first element OR of the channel, the output of the second element of the channel is connected to the first input m of the second OR element of the channel, the outputs of the first and second OR elements of the channel are connected respectively to the first and second inputs of the channel transmitter, the transmitter output of one channel and the receiver input of another channel are connected to the second switch input of one of the channels, the second receiver output of the channel is connected the first input of the third: element AND channel; zero output; the trigger of one channel is connected to the second input of the third element AND another channel; the third inputs of the third elements And channels are connected to the permissive input; The output of the third element AND channel is connected to the single input of the channel trigger, the zero inputs of the channel triggers are connected to the output of the pause analyzer, the second outputs of the channel receivers through the OR signal of the sync signals are connected to the first input of the pause analyzer, the second stroke of which is connected to the first reset input of the device the outputs of the first elements AND channels through the element OR codes are connected to the information output of the device, the outputs of the first elements AND of the first and second channels are connected respectively to 1 and zero the first inputs of the device trigger, the first inputs of the fourth and fifth elements of the channel are connected to the corresponding information input of the device, the installation and second fault inputs of the device are connected respectively to the unit and zero inputs of the device trigger, the unit output of the device trigger is connected to the second inputs of the fourth elements of the channels And the zero output of the device trigger is connected to the second inputs of the fifth elements And channels, the outputs of the fourth elements And the first and second channels are connected respectively with the second inputs of the first and second elements or the second channel, and the outputs of said fifth member and the first and second channels respectively connected to second inputs of first and second or the first channel. 2. A device according to claim 1, wherein the pause analyzer is made in the form of a counter, the counting and zeroing inputs and output of which are connected respectively to the first, VTO1Zh1M inputs and output, pause analyzer. Sources of information taken into account in the examination 1. Works of the Institute of Electrical and Radio Engineering, W 10, vol. 68, 1980. , with. 150, fig. one. 2. Kagan BM, Kanevsky. Digital computers and systems, M., Energie, 1973, p. 537, fig. 10-8 (prototype).