SU1702379A1 - Two computer interface - Google Patents

Abstract

The invention relates to computing and can be used in automated control systems and CAD systems. The aim of the invention is to expand the functionality of the device. The goal is achieved by the fact that a device containing two of the same type of communication unit, each consisting of a transceiver, two amplifiers, two input and two output optical links, is inserted into each communication unit two pulse shapers and an OR element. The transceivers of the communication units are connected to the corresponding computers. The output elements of the optocoupler of one communication unit are connected via two-wire communication lines with the input elements of the optocoupler of another communication unit. 2 Il.

Description

The invention relates to digital computing and can be used to communicate digital computers via a serial channel in distributed systems.

A communication device is known via a serial channel, implemented on a KS 580 bi-LSI. This device allows you to organize a radial serial communication of a digital computer group.

The disadvantage of this device is the need to initialize the BIS K 580 series when the device is turned on. For this, a ROM is installed in the communication device. This complicates the device. In addition, in the process of information exchange, communication link failures are possible and initialization is also necessary to restore normal operation, which complicates the exchange process.

Also known as a serial communication device, implemented on small integration elements.

The specified device has a large number of elements and, therefore, low reliability. In addition, it does not allow binary data encoding to be transmitted.

Closest to the present invention is a communication device between an intelligent terminal and a central digital computer, implemented on an LSI serial transceiver K 1801VP-065.

The disadvantage of this device is the limited range of use — the transmission of symbolic information. In the organization of communication, where the exchange of information is carried out by data arrays, it is necessary to form |

ABOUT

K CO XI O

There is a sign the end of the transfer of the data array. However, due to the absence of this feature in the BIS transceiver parcel format, it is necessary to form it in the information part of the parcels, which is possible only by sending (4 transmissions of symbol codes. This increases the load on the digital computer for the exchange service, since the CESH should perform additional analysis of each received the character. To transfer a data array with binary coding (machine codes), the formation of a sign of the end of the array in the information part of the package is impossible.

The aim of the invention is to expand the field of application of the device by providing exchange of binary data.

This goal is achieved by the fact that, in a device containing the first and second communication units of the same type, each of which contains a transceiver, the first and the second amplifiers, the first and second output elements of the aptron, and in each communication unit the address / data input / output, input and control output of the transceiver, the data input of which is connected to the output of the first input element of the optocoupler, are connected respectively to bidirectional address / data buses and output and input control buses processor, and the output of the first output element of the optocoupler, the input through the first amplifier is connected to the data output of the transceiver and the output of the second output element of the optocoupler, whose input through the second amplifier is connected to the output readiness to receive the transceiver of one unit connection, connected by a two-wire line of communication to the input of the first and second input element of the optocoupler of another communication unit, and each first communication unit of the first and second drivers and the OR element, cerned first input connected to the output of the second input member opto isolator, and the second input - via a series connection of the first and second shaper output data to the transceiver, and the output - to the input his authorization data,

Figure 1 presents the block diagram of the device; figure 2 - diagrams of signals on the serial channel.

The device contains the same type of communication blocks 1 and 2, interconnected by four two-wire communication lines. Each communication unit includes transceiver 3 and 4 control inputs and outputs, input / output whose address / data

connected to the corresponding digital processors, the first 5 and b and the second 7 and 8 amplifiers, the first 9 and 10 and the second 11 and 12 weekends and the first 13 and 14 and the second 15 and 16

optocoupler input elements connected in series between the 3 w 4 transceiver and the corresponding two-wire communication line, the first 17 and 18 and second 19 and 20 pulse shapers connected in series between the output of each transceiver 3 and 4 and the OR 21 and 22 element. Transceivers can be performed on the BIS K 1801-065,

The device works as follows.

In a state in which there is no exchange between transceiver 3 and 4 at the outputs TF (data output) and PP (ready

data reception) and inputs (serial data reception) and BSYD (data transmission resolution) level O is present. A current I 20-40 mA flows through the communication lines,

Consider the case of data transmission from transceiver 3 to transceiver 4. Data byte transmission begins with the occurrence of level 1 at the TF output of transceiver 3 (Start bit), through which

transceiver 4 is prepared to receive and record a byte of information. Level 1 signal through amplifier 5 and output optocoupler 9 sets the current in line f 0. At current I 0, input optocoupler 14 at the input

P transceiver 4 sets the level 1. Thus, the change in the logical state at the output 1 P of the transceiver 4 completely repeats the change in the logic state at the output TF of the transceiver 3 (FIG. 2a). Upon completion of the byte, the output level T (stop bit) is set at the output TF of the transceiver 3. The level O at the output of the TF of the transceiver 3 can be set either in the absence of the next message or the signals G at its input BSYD. Signal 1 at the input of BSYD transceiver 3 is established by the occurrence of signal 1 at the output of the PP transceiver 4 after it has received a byte. This signal through the amplifier 8, optocouplers 12 and 15, the operation of which is similar to that described, sets signal 1 at the first input of the element OR 21 and through it at the input of BSYD

transceiver 3. The installation of signal 1 at the output of BSYD transceiver 3 may occur from the occurrence of signal 1 at the second input of the element OR 21 when the generator 19 is triggered. This occurs after the occurrence of

1 at the TF output of the transceiver 3, from which the driver 17 is triggered, and the driver 19 from its trailing edge. The duration of the pulses T1, T2 of the drivers 17 and 19 (Fig. 2b, e) are selected so that the occurrence of signal 1 at the BSYD input of the transceiver 3 that coincides with the moment when it sends the stop bit only confirms state 1 at its output TF. Therefore, the physical signal of the transmitted byte transceiver 3 outputs without distortion. After processing the received byte at the PP input of the transceiver 4, a level O occurs, i.e. the transceiver is ready to receive, at the input BSYD of transceiver 3, a level O is set and the data transmission is resumed. This is the transfer of the data array. The end of the transmission of the array transceiver 3 informs the transceiver 4 as follows. At the end of the transfer of the last byte of the data array, the transceiver 3 at the TF output sets the level 1-signal Break the line. Signal generation A line is broken by writing signal 1 to the zero register of the transmitter of transceiver 3. After issuing the last information byte of the array, the zero byte is written to the transmitter's buffer register, and zero to the zero register of the transmitter's state register. Then the zero byte is written to the buffer register, and 0 is written to the zero bit of the state register (Fig. 2). Writing zero bytes is necessary to clear the transmitter readiness flag for a digital computer when generating a line break signal.

Consider the operation of the communication device when a signal appears. The line is broken at the output of the TF of the transceiver 3. When transmitting the zero byte, the output of the TF of the transceiver 3 is set to level 1 (FIG. 2 d), which is transmitted through the amplifier 5 and the optrons 9 and 10 P transceiver. When transmitting a zero byte, level 1 must be kept until parity bit. At the parity bit, the TF of the transceiver 3 should be set to O, since the transceivers are tuned to odd parity. But since simultaneously with the issuance of a zero byte at the output of the TF of the transceiver 3, the signal of the line rupture acts, it supports level 1 and at the parity bit. In this situation, the transceiver 4 generates a parity error signal and records 1 to 15 bits of the receiver status register. This 1 digital computer perceives as

end of array transfer. In addition, simultaneously with the occurrence of level 1 at the output of the TF of the transceiver 3, 5 consecutively shapers of 17 and 19 are started. Level 1 of the former 19 through the OR 21 element enters the BSYD input of the transceiver 3 and causes the occurrence of O at the output of the transceiver0 of sensor 3, i.e. . the formation of stop bits at the output of the TF transceiver. Upon receipt of and processing a byte, transceiver 4 at the output of the RRustan level O. Transceiver 3 transmits the second zero byte,

5a The digital computer removes the signal to break the line and can proceed to output the next data set, if necessary. Transferring a data array in the opposite direction is similar with the only difference that

0 for this use: there is another link. The inclusion of two drivers and an OR element between the output of the TF transceiver and the input of the BSYD provides the ability to transfer an array of data from

5 by arbitrary encoding of information, which expands the field of application of a communication device based on an LSI. In addition, the load on the DVR for servicing the communication device is reduced.

Claims (1)

0 claims A device for interfacing two computers, containing two communication units, each of which contains a transceiver, groups of address-informational inputs-outputs and control inputs and outputs of which are corresponding groups of input-outputs, inputs and outputs of the device for connecting groups of targeted information 0 inputs and outputs and control outputs and inputs of the corresponding computing machine, two amplifiers, two input and two output elements of the optocoupler, and an output and an input for each communication unit 5 serial data and the readiness output of receiving the transceiver data are connected respectively to the input of the first amplifier, the output of the first input element of the optocoupler and the input of the second amplifier, the outputs of the first and second amplifiers are connected respectively to the inputs of the first and second output elements of the optocoupler, and the outputs of the first and the second output elements of the optocoupler of the first and second communication units are connected via corresponding two-wire communication lines with the inputs of the first and second input lementov second opto-isolator and the first communication unit, respectively, characterized in that, in order to expand functional capabilities of the device by providing binary data exchange, two pulse generators and an OR element are entered into each communication unit of the device, and in each communication unit the transceiver data transmission resolution input is connected to the output of the OR element, the first input which is connected to the output of the second input element of the optocoupler, the output of the serial data of the transceiver is connected through the left pulse generator to the input of the second pulse driver, the output connected to the second input of the OR element, T1 1Z Star F AT Stop stop 12 fosp