RU1774340C - Computer-to-terminals interface - Google Patents

Abstract

The invention relates to computer technology and the transmission of digital information and can be used to build a system with remote terminals, in particular for preparing information on a computer medium from remote terminals using a computer. The aim of the invention is to reduce the hardware costs of the device. The use in the system of trunk lines of communication, amplifiers, registers, a node of input synchronization counters, a node of output data synchronization counters, a decoder of an indication of commands and information, an operation trigger and AND circuits allows for a significant reduction in hardware costs of the device to ensure reliable interface between computers and terminals . 1 silt

Description

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The invention relates to computer technology and the transmission of digital information and can be used in the construction of systems with remote terminals, in particular for the preparation of information on computer media using computers.

Known information transmission systems consisting of a group control device, terminals, terminal blocks, including a receive-transmit register, an address decoder, an address code shaper, a clock allocation unit, a send busy code decoder, an operation mode switch, an acknowledgment code encoder , tiker, element I (see ed. St. USSR No. 798777, class G 06 F 3/00, 1980).

The disadvantage of these systems is the cumbersome hardware costs caused by the need to form and process a package of four fields with obligatory confirmation by the terminal of reception of each package.

The purpose of the invention is to reduce the hardware costs of the device.

This goal is achieved in that in a device containing a communication unit, the first and second information inputs and outputs of which are corresponding inputs and outputs of the device for connecting to information outputs and computer inputs, M terminal connection blocks, the serial code information inputs of which are connected to the second information output of the communication unit, and the information outputs of the serial code with the second information input of the unit

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communication, and the information input and output of the parallel code, the first and second permission outputs and the request input of each terminal connection block are the corresponding inputs and outputs of the device for connecting to the information output and input, output enable input, input enable input and request output of the corresponding terminal moreover, each terminal connection block contains an input data amplifier, an input data register connected by an information input to the output of an input data amplifier, a decoder, a trigger Works, two AND elements, an NOT element, a pulse generator and an output data register, moreover, in each terminal connection block the input of the input data amplifier and the output of the output data amplifier are respectively the information input and output of the serial code of the terminal connection block, the output of the input data register and information the input register of the output data is respectively the information output and the input of the parallel code of the terminal connection block, a node is entered into each terminal connection block input data synchronization counters and output data synchronization counters node, and in each terminal connection block, the input data amplifier output is connected to the input of the input data synchronization counters node, the first, second, third outputs of which are connected respectively to the synchronization input of the input data register and the first inputs of the first and the second AND elements, the second inputs of which are connected respectively to the high-order output of the input data register and the output of the NOT element, the outputs of the input data register of the first and the second element And are connected respectively to the information and enable inputs of the decoder, the first and second outputs of which are connected respectively to the installation and reset input of the trigger, the sync input connected to the corresponding output of the group of outputs of the decoder, the output of the trigger is connected to the third input of the second element And and through a pulse shaper with the input of the node of the output data synchronization counters, the first and second outputs of which are connected respectively to the resolving input of the amplifier yhodnyh data latch operation information input connected to the input of NOT circuit and the input connection-request terminal block, the output of the trigger, the second element and the output of AND

the third output of the output synchronization counters node is respectively the first and second enable outputs and the output synchronization output of the terminal connection unit, the output synchronization output of each terminal connection unit is the output of the device for switching to the output synchronization input.

0 Comparative analysis with the prototype shows that the inventive device is characterized in that in order to reduce hardware costs, an input data synchronization counter unit and an output data synchronization counter unit, communication trunk lines, amplifiers, input registers and output, decoder of the command attribute and information, trigger

0 works, schemes AND NOT,

Thus, the inventive device for interfacing computers with terminals meets the criteria of the invention of novelty. Comparison of the claimed solution is not

5 only with a prototype, but also with other technical solutions in the art, shows that the above elements are widely known. However, when they are introduced into the indicated interaction, the reciprocal device exhibits a new property, which leads to a reduction in the hardware costs of the device, which allows us to conclude that the criterion meets significant differences.

5 The drawing shows a structural diagram of the device.

The device contains a communication unit 1, the first and second information inputs and outputs of which are the corresponding inputs and outputs of the device for connecting to the information outputs and computer inputs, M connection blocks of terminal 2... 5, the information inputs of the serial code of which are connected to the information output of the communication unit 1, and the information outputs of the serial code with the second information input of the communication unit 1, moreover, the information input and output of the parallel code, the first and second permission outputs and input the request of each terminal connection block are the corresponding inputs and outputs of the device for connecting to the information output and input, output enable input, input enable input and request output of the corresponding terminal, each terminal connection unit contains an input data amplifier 6, an input data register 7, connected by information

an input with an output has an amplifier b of input data, a decoder 10, a trigger 11, two AND 9 elements. 13, an element 12 NOT, a pulse shaper 14 and a register 16 of output data connected to the input of an amplifier 17 of output data, with an input for each terminal block amplifier

6 the input data and the output of the amplifier 17 of the output data are respectively the information input and output of the serial code of the terminal block, the output of the input register 7 and the information input of the register 16 of the output data are respectively the information output and parallel input of the terminal block of the synchronization counter node 8 input data and a node of synchronization counters 15 output data, and in each terminal block, the output of the input data amplifier 6 is connected to the input m node of synchronization counters 8 input data, the first, second and third outputs of which are connected respectively to the clock input of the register 7 input data and the first input of the first 9 and second 13 elements And, the second inputs of which are connected respectively to the output of the highest order of the input register and others and element output 12 is NOT, register outputs

7 of the input data and the first element 9 And are connected respectively to the information and enable inputs of the decoder 10, the first and second outputs of which are connected respectively to the installation input and the reset input of the trigger 11 of operation, the sync input connected to the corresponding output of the group of outputs of the decoder 10, the output of the trigger 11 of the work is connected to the third input of the second element 13 And and through the driver 14 of the pulse with the input of the node counters synchronization 15 output data, the first and second outputs of which are connected respectively the permissive input of the amplifier 17 of the output data and the synchronizing input of the register 16 of the output data, the information input of the trigger 11 is connected to the input of the element 12 NOT and the input request of the terminal block, the output of the trigger 11, the output of the second element 13 And and the third output of the node counters synchronization 15 output the data are respectively the first and second resolution outputs and the synchronization output of the terminal connection unit, the synchronization output of the output of each terminal connection unit is the output devices for switching to the output synchronization input of the corresponding terminal.

The device operates as follows.

The device is designed to interface computers with terminals for organizing the simultaneous operation of many users and provides both input and output of information from a computer.

Communication unit 1 is connected to terminal connecting units via a 3-wire communication line, with two lines being information lines, a third line being a common bus and not shown in the drawing.

The data structure on the communication lines corresponds to the data structure of the interface C2 - start bit + 8 data bits + 2 or more stop bits.

Computer data can be of two types:

a) control data is transmitted with a unit in the high bit;

b) information data is transmitted with zero in the high bit.

The data transmitted by the communication unit 1 to the line is amplified by an amplifier b of input

data and are fed to the input of the input data register 7 and to the input of the input data synchronization counters node 8, which provides the recording of data transmitted over the communication line in the serial code to the input data register 7 in the parallel code, polling the high bit of the received data on the first element 9 Both and polling the status of the request input on the second item 13 AND.

When there is information for transmission at the terminal, it is fed from the input of the parallel code of the terminal connecting block to the information input of the output data register 16, and the application for the terminal is fed through the request input to the information input of the trigger 11 and through the circuit 12 NOT to the second input of the second circuit 13 I.

Interrogation of terminal applications is carried out by alternately issuing terminal addresses in the form of control data to the communication line. Node of synchronization counters 8 input data in the presence of the most significant bit in the received code through the first circuit 9 AND

allows the operation of the decoder 10.

The terminal number in the system is set by a jumper connecting the corresponding output 1.p of the decoder to the sync input of the trigger 11 of operation. A trigger request is sent to the trigger information input. If there is a request for a signal at the output of the decoder 10, the operation trigger 11 is set to one. In this case, the first output circuit is prepared

output resolution third input of the second element 13 I.

Turning on the operation trigger 11 through the pulse shaper 14 starts the node of the output synchronization counters 15, which ensures that the terminal information is recorded in the output data register 16 and transmitted in serial code to the communication line through the amplifier 17 in the serial code. The third output of the synchronization counter assembly 15 provides for resetting the applications of the terminal, which through the circuit 12 does NOT prepare the second input of the AND circuit 13 to generate an output synchronization signal. In the address receiving cycle, this signal is not generated.

The computer, having received terminal data, performs operations related to input control, processes the received information and provides information for indication to the terminal.

In the information transfer cycle, the established trigger 11 for operation and removal of the application of the terminal allows the output synchronization signal to be generated through the first input of the second element 13 And the third output of the node of the synchronization counters 0 of the input data. In this case, the data supplied from the output of the input data register 7 to the information output of the parallel code is recorded in the terminal. In this way, all information intended for a given terminal is provided. Having given the necessary information, the computer will issue a command to reset the trigger 11 of the work and proceeds to the polling of applications of the next terminal.

In the absence of applications from the interrogated terminal, the data are not received by the computer and it proceeds to interrogate the applications of the next terminal.

Information to the terminal can be issued even if there is no application: the computer issues a command to the installation input of the trigger 11, issues information in the manner described above and issues a reset command for the trigger 11.

Claims (1)

The claims A device for connecting a computer with terminals, containing a communication unit, the first and second information inputs and outputs of which are the corresponding inputs and outputs of the device for connecting to information outputs and computer inputs, M terminal connection blocks, the serial code information inputs of which are connected to the second information output of the communication unit, and information outputs of the serial code with the second information input of the communication unit, the information input and output of the parallel code, the first and second the permission outputs and the request input of each terminal connection block are the corresponding inputs and outputs devices for connecting to the information output and input, output enable input, input enable input and request output of the corresponding terminal, each terminal connecting unit 0 contains an input data amplifier, an input data register connected by an information input to an input data amplifier output, a decoder, an operation trigger, two AND elements, an NOT element, a pulse generator and an output data register, output connected to an output data amplifier input, and in each the terminal connection block, the input data amplifier input and the output amplifier 0 L of the output data are respectively the information input and serial code output of the terminal connection block, the output of the input register data and information input 5 output data registers are respectively an information output and a parallel code input of a terminal connection unit, characterized in that, in order to reduce the hardware overhead of the device, an input data synchronization counter unit and an output data synchronization counter node are introduced into each terminal connection unit, to each terminal block of the terminal, the output of the input data amplifier is connected to the input of the node of the input data synchronization counters, the first, second, and third outputs of which are connected to responsibly to the clock input 0 input data registers and the first inputs of the first and second elements AND, the second inputs of which are connected respectively to the output of the highest order of the input data register and the output of the element NOT, the outputs of the input data register and the first element And are connected respectively to the information and enable inputs of the decoder, the first and the second outputs of which are connected respectively to the installation 0 by the input and input of the reset of the trigger of operation, the sync input connected to the corresponding output of the group of outputs of the decoder, the output of the trigger of operation is connected to the third input of the second element And and through 5 pulse shaper - with the input of the node of the output data synchronization counters, the first and second outputs of which are connected respectively to the enable input of the output data amplifier and the synchronization input of the output register data, the information input of the operation trigger is connected to the input of the element NOT and the request input of the terminal connection unit, the output of the operation trigger, the output of the second element AND, the third output of the output data synchronization counters node are the first and second outputs, respectively enable and output synchronization output terminal block connection, and the output synchronization output of each terminal connection block is the output of the device for connecting to the output synchronization output of the corresponding terminal.