SU744539A1 - Interface - Google Patents

Description

(S4) PAIRING DEVICE

one

The invention relates to computing and can be used in real-time automated teleprocessing systems.

Systems are known that unite a data processing center consisting of one or several computers, connected to remote subscriber terminals concentrated in subscriber peripheral points through dedicated data transfer channels, HanpHNtep, a system for reserving places and selling tickets 1.

However, in these systems, the computer complex does not solve a complete set of tasks, as a result of which there are subscribers in the processing center who, due to the nature of the technological problem they are solving, exchange information with subscribers of peripheral points.

Interface devices of computer complexes with communication channels, built on the basis of small computers and realizing the functions of the front edge processor, are known. These devices provide subscriber terminal connections, and the terminals of the peripheral points are connected via

dedicated (or ij commutated) communication lines, and the center terminals via physical lines. The known interface devices exchange information between subscribers without accessing the processing center computer if the messages of the subscribers do not require processing in center 2.

The disadvantage of these known

The 10 devices are their complexity, low speed, operational maintenance difficulties and low reliability due to the specifics of software processing in small computers.

15

Closest to. proposed by the essence of the technical solution, an interface device containing communication nodes with subscribers, each of which is connected by a first input and

20 output with the corresponding subscriber output and input of the device, and the second input with the output of the corresponding accumulator, priority control block, service encoder

25 signs connected by the output to the first input of the communication node with a cable, the second input of which is connected to the output of the direction address encoder, and the first output to the first inputs of the service characteristics decoder and the address address decoder 3Q, which outputs are connected to the control inputs of the corresponding drives The information inputs of the connected with the output of the communication node are with the channel, the third input and the output of which are the input outputs of the device. The decoder of service signs of this device contains a unit for analyzing the Kan mode. The encoder of service signs includes the subscriber priority cell, the AND element and the pulse shaper; the priority control block - the OR element and the Subscriber mode analysis block. The device provides the interface between terminals and other input-output devices installed at the Avonent system point associated with the processing center through a dedicated data channel 3.. The disadvantage of this device lies in the limited functionality and is manifested in cases in which there are services in the system whose operators do not work with the processing center, but exchange messages with subscribers of the system. Under these conditions, to ensure their exchange, either additional communication channels are used, or the exchange must be carried out through the computer of the processing center. As a result, the system contains a large number of high-cost and, katc generally, weakly-loaded data transmission channels, or the center load increases dramatically. . The purpose of the invention is to expand the functionality of the device by providing an asynchronous time seal mode for the data transmission path. The goal is achieved by the fact that the device containing communication nodes with subscribers, each of which is connected to the first input and output, with the corresponding subscribers. device output, and the second input - with the output of the corresponding storage device, the service characteristics encoder, connected by the output to the first input of the communication node with the channel, the second input of which is connected to output address encoder output, and the first output - to the first inputs of the decoder service signs and the address address decoder, the outputs of which are connected to the control inputs of the respective drives, information inputs connected to the second output of the communication node with the channel, the third input and output are channel and device outlets, are introduced - switch, a group of subscriber inputs and outputs of which are connected to the outputs and inputs of the corresponding communication nodes with subscribers, the counter transmitted by the ring regional rp line encoder

Claims (1)

744539 terminator, terminator sign and received character counter, the switch output is connected to the first inputs of the transmitted sign counters, service character encoder, terminator attribute encoder, direction address encoder, terminator attribute decoder, and fourth node input. Communication with the channel, the fourth output of which is connected to the first input of the switch, the second and third inputs of which are connected respectively to the outputs of the ring register of the queue and the termination feature decoder, the control inputs CATHOE (OX connected to the output of the service feature encoder connected by the second input to the first output the transmitting counter, the second input and the output of which are respectively connected to the output of the 1st direction breaker and the second input of the terminator sign encoder, connected to the fifth input evil connection with the channel, the fifth output of which is connected to the second input of the terminator feature decoder, the third input of the terminator feature encoder is connected to the second input of the direction address decoder and the output of the service characteristics decoder, the first and second inputs of which are connected respectively with the first input and output of the counter received characters, connected by the second output to the third inputs of the decoder of the direction address and the decoder of service signs, the information inputs of which are connected to the second output of the communication node with anal and the first input of the counter the received symbols. FIG. 1 shows a block diagram of the device ;, FIG. 2 - a fragment of the system using the device. The device (Fig. 1) contains nodes 1 and 2 of communication with subscribers, drives 3 and 4, switch 5, address encoder 6, directions, transmitted character counter 7, service feature encoder 8, queue ring register 9, decoder sign 10 of completion, communication node 11; analog, the decoder 12 address directions, the counter 13 received characters, the decoder 14 service signs, the encoder 15 sign of completion, subscriber input and output 16 of the device and channel input and output 17 of the device. FIG. 2 shows the devices 18 and 19 for interfacing, the computer 20 of the data processing center, the terminals 2123 and the communication channel 24, connected via channel inputs and output 1 to the devices. 18 and 19. The subscriber inputs and outputs 1fi of J8 and 19 DEVICES are connected to computer 20 and thermal egr.) 21-23 (subscribers The device works as follows. When transmitting, for example, from computer 20 a message that does not require a tract to be fixed (message of the first type ), The computer 20 sends signals and data to some input of the device 18 for issuing it to the terminal 21 connected to the same output of the device 1. From the register 9 to the switch 5 of the device 18, the addresses of subscribers are issued according to which the switch 5 connects to the node 1 of the corresponding subscriber encoders b, 8 and score IR 7 The presence of a transfer request is recorded in the encoder b, which forms the code of the direction address and the type of message arriving at node 11 for transmission to channel 24 from output 17. With the same signal, the encoder 8 and counter 7 are started, causing blocking of the ring register 9 and the characters transmitted from node 1 are counted.After issuing the last character of the message block, counter 7. outputs a signal to the encoder 8, which controls the signals at the junction between nodes 1 and 11 and generates the code of one of the service status indicators: end code b flash message code or the end of all messages. The first service tag triggers the issuance of each message block, and the second service tag prohibits the transfer of the last block and the entire message. When a message block of the first type is transmitted, the generated service attribute from the encoder 8 enters the node 11 dp of issue in swatch 24, the information in the decoder 10 completes the transmission of the information block and unlocks the ring register 9, which then generates and issues a new adses. At the receiving side, the device 1, at the input 17 of the node 11, receives a block of information of the transmitted message. From node 11, the first character of the received information, denoting the address of the output of the subscriber output corresponding to the adapter of the receiving terminal 21, enters the decoders 12 and 14 and the counter 13. The decoder 12 decrypts this address and sets the node 1 of the selected output to write to its drive 3 incoming characters information. At the same time, a count of 13 characters is counted by the counter 13 and the analysis of the junction signals between the subscriber and the channel in the encoder 15. Upon receiving the last character of the information block containing the service attribute and the absence of incorrect situations, the encoder 15 generates a confirmation word posted through node 11 to channel 24 . -This confirmation from the communication link is Noat at node 11 of device 18 and then to decoder 10i in which, when the address of this direction is sent to the input of switch 5 by the ring register 9, the transmission is resumed according to the algorithm have described BbBiie. For this, the switch 5 switches the node 1 of this subscriber to the node 11, signals are exchanged at the junction and the output from the node 1 of information,. If, at reception, subscriber 21 or node 11 of device 19 detects any abnormality, then the encoder 15 will generate an indication of an abnormal termination that goes to node 11 of device 18, according to the corresponding signals at the junction, as a result of which the Transmitting Unit is transmitted or emergency procedures are performed. completion of the transmission cycle for this direction. When transmitting a high priority message that requires a channel capture for the entire transmission time (second type message), the subscriber signals from node 1 to block switch 5. In this case, in the first characters of the message, the addresses of direction, issue and of the message type, the encoder 8 prohibits the issuance of addresses from the ring register 9 until the last character of the message is issued and the service indication of the end of the message is generated. In this case, the message is not necessarily divided into blocks, and a sign of successful or unsuccessful completion is generated by. the results of receiving the entire message by subscriber 21 in device 19 as described above. After receiving the service indication of the end of the message, the encoder 15 of the device 19 through the node 11 outputs to the communication channel a sign of completion, which is perceived through the node 11 of the device 18 and enters the decoder 10 and to the interface of the transmitting subscriber. Upon successful completion, the switch toggle lock 5 is released, the address of the other direction is output, and the process is repeated. The device operates in full duplex mode with half duplex operation mode of each individual subscriber. In this case, each direction operates independently, ensuring mutual exchanges between directions of the same name over a single communication channel. A useful feature of the device is that the computer program works with the terminals 21 as if each of them is connected to the computer via a separate dedicated channel, i.e. The device provides the transparency of the transmission path to the tax level. Thus, the extended functionality of the proposed device allows reducing hardware costs for interfacing various devices to exchange information with each other through the remote communication channel. Claim device for interfacing, containing communication nodes with subscribers, each I9 of which is connected by the first input and output with the corresponding subscriber inputs and output of the device, and the third input - with the output of the corresponding (the memory accumulator, the encoder of service signs, the output connected with the first input of the communication node with the channel; the second input of KOTORO is connected to the output of the direction address encoder, and the first output to the first inputs of the service characteristics decoder and the decoder of the direction address; the output of which is connected to the corresponding inputs; the information inputs. connected to the second output of the communication node with the channel, the third input and output of which are the channel outputs of the device, so that expanding the functionality of the device by providing an asynchronous time seal mode for the data transmission path, a switch has been entered into it, a group of abrneyt inputs and outputs of which are connected to the outputs and the input of the corresponding communication nodes with subscribers a, a queue ring register, a termination flag coder, a termination flag decoder, and a received character counter, the switch output being connected to the first inputs of the transmitted character counter, service character encoder, termination flag encoder, direction address encoder, termination symptom terminator, and fourth communication node input with the channel, the fourth output of which is connected to the first input of the switch, the second and third inputs of which are connected respectively to the outputs of the ring register of the queue and the di-ipra Completion sign ora, the control inputs of which are connected to the output of the service characteristics decoder, connected by the second input to the first output of the transmitted character counter, the second input and output of which are respectively connected to the output of the direction address encoder and the second input of the completion sign encoder connected to the fifth input the communication node with the channel, the fifth output of which is connected to the second input of the termination feature decoder, the third end of the termination feature encoder is connected to the second descriptor terminal and service address and output of service characteristics decoder / first and second inputs of which are connected respectively to the first input and input of the counter of received characters connected by the second input to the third inputs of the direction address decoder and service characteristics decoder, the information inputs of which are connected to the second output node of the node zi with the channel and the first input of the counter of received characters. Sources of information taken into account in the examination 1. Zhozhikashvili V. A., et al. Tele-automatic system for mass monitoring Instrumentation and control systems, 1970, 9. 2, D. Davis and Barber D. Communication networks for computing mother's, Ch. .Z, M-., Mir, 1976. 3. USSR author's certificate No. 503232, cl. G About F 3/04, 1974 (prototype). / 7 L / /