SU723561A1 - Interface - Google Patents

Description

one

The invention relates to computing and can be used to interface a computer with a telegraph communication channel.

Teletype interfacing devices are known that translate telegraphic signals into machine words and backwardly and contain analysis units for starting and stop parcels, shift registers, generation buffer unit, stop and telegraph unit formation units, code conversion unit, encoder and decoder for symbols 1

The disadvantage of these devices lies in the low bandwidth of the interface, because the conversion of message formats (machine words into telegraph characters and vice versa) is carried out by a computer program.

The closest to the proposed technical entity is an interface device containing a register, three groups of AND elements, a key, a receiver, a decoder, a counter, a pulse generator, an input trigger, a trigger, six AND elements, an inverter, two OR elements, start triggers , output, readiness, and the register is connected with three groups of elements And, the decoder is connected with a counter, two groups of elements And, with a trigger and through the first element And with a register, the key is connected with the third group of elements And and the receiver, the output of which inn with the second element And and the inverter, the pulse generator is connected to the counter, the trigger trigger and the second element And, the trigger trigger is connected to the trigger of the output, with the ready trigger, trigger, counter, the third and fourth element And, the inverter and through the first element OR with the trigger start, and the trigger is connected to the third group of elements And, the fourth and floating elements X one of the outputs of the decoder 2.

The disadvantage of this device is low bandwidth.

The purpose of the invention is to increase the capacity of the device.

This goal is achieved by the fact that the device containing the register, the first inputs to the output of which are, respectively, the first information input and output of the device, a trigger, two OR elements, a pulse counter, two AND elements connected by the first inputs to the output of the ready trigger, and the outputs to the corresponding control outputs of the device, and the driver of the control signals connected to the clock output with the second register input and the counting input of the counter, and the first input to the input End of the device word, the first the readiness trigger stroke is connected to the input of the Beginning of the device word, a parser descrambler, a single pulse generator, a character counter and a receive-trigger trigger are entered, the second register output is connected to the trigger control input, the output of which is the second information output of the device, the third output is connected to the input of the descrambler is supplied to, and the third input - with the second information input of the device and the input of the generator of a single pulse, the output of which is connected to the synchronizing input of the driver signals and the first input of the receive / issue trigger connected by the second input to the first input of the ready trigger, and the first output to the second input of the first element AND and the second input of the control signal generator whose third input and second input of the second element I are connected to the second output of the trigger trigger - The keys, the outputs of the parcel debriser and the symbol counter are connected to the corresponding inputs of the first OR element connected by the output to the second input of the readiness trigger, the fourth and fifth inputs of the driver The signals are connected {{wired} respectively to the synchronizing outputs of the parser debriser and the symbol counter, the control inputs of which are connected to the first trigger input, the second input of which are connected to the first trigger input, the second input connected to the output of the second element OR, to the control input of the pulse counter and the first output of the driver of the control signals, the inhibit input of which is connected to the output of the pulse counter and the control input of the generator of single pulses, and the second output and the first input - to the corresponding these inputs of the second element OR. The drawing shows a block diagram of an interface device. The device contains a register 1, a counter 2 pulses, elements AND 3 and 4, trigger 5, readiness, triggers 6 and 7 transmit-receive, elements OR 8 and 9, a decoder of 10 parcels, a form AND control signals, a generator of 12 single pulses , counter 13 characters, informational inputs 14 and 15, you

 move 16 Ready for output, output 17 Go9 for setting in one state triggers for receiving, information outputs 18 and 19, inputs 20 End of word and 21 Beginning of the word of the device The device works as follows. In the reception mode from the telegraph channel, the character code is sequentially inputted to register 1 and to generator 12, which generates one trigger pulse on the leading edge of the starting parcel. The trigger pulse sets trigger one to 7 and resolves five shift pulses with a follow-up period of 20 ms (telegraphic send time) from the clock of the driver 11, and the first pulse is emitted 30 ms after the start pulse arrives so that the shift pulses are located centered telegraph coded parcels. Such a temporal arrangement of the shift pulses is chosen to exclude the recording of the starting package and more reliable recording of the code packages. The shift pulses go to register 1 to write code messages and to counter 2, the fifth shift pulse from the output of which goes to generator 12, allowing the next start pulse (on arrival of the starting send), and blocking the shift pulses. Simultaneously, from the first output of the imaging unit 11, a pulse is transmitted to the decoder 10 to install the trigger 6 into one state, to reset the counter 2 to the initial state and to the counter 13 input. The number of characters written to the register 1 for assembling the word is dependent on the number of masking bits the words. When the last symbol is received, the counter 13 issues a signal for setting trigger unit 5 into a single state, allowing the potential from a single output of which goes to the first input of an element 3, which is open through the second input to a high potential from a single output of trigger 7, and output 16 COMPUTER SIGNAL Ready to output. The computer before receiving (or data) information on input 21 is a signal of the beginning of a word, which sets the triggers 7 and 5 to the zero state, after which the information is entered in a computer with a sequential code on the first information output 19. To shorten the device time, one of the symbols (e.g., Point) is used as a signal for the end of the exchange. After the Dot symbol arrives from the channel into register 1, the decoder 10 fills in at the second input with a fifth shift pulse and outputs a signal through the OR element

pa 5, regardless of the number of characters received in the register 1.

In the mode of transmission to the telegraph channel from the computer, by information input 15, the serial word is recorded in register 1. After one clock cycle, the end of the word at input 20 goes through the OR element 8 to the zero setting of trigger 6 (forming the starting parcel) and at the same time a shaper 11 for generating shear pulses with a wiring frequency.

The first shift pulse is emitted 20 ms after the arrival of the signal. The word end shifts the first code message from register 1 to trigger 6, which is one hundred l in zero position (starting package), each shift pulse being the end of the previous message and the beginning of the next .

The fifth shift pulse from the counter 2 enters the shaper 11 and prohibits the output of the shift pulses, but allows generation of the sixth pulse at the first output 20 ms after the fifth one, which arrives at the installation in one state of trigger 6 (formation of a stop parcel), at the installation to the initial state of the counter 2, to the input of the counter 13 and to the decoder 10. When transmitting to the telegraph channel, only five bits (point code) of register 1 are analyzed, which must be shifted in the next exchange.

If the Point code is not present, then the AND generator 30 ms (after the sixth) returns the seventh pulse from the second output through the OR 8 element to the zero setting of trigger 6, i.e. the next starting parcel is formed, and after 20 ms (after the seventh) ) the next five shear pulses are produced. Similarly, the remaining characters are shifted. When issuing the last character from register 1, the control potential from the first output of the counter 13 prohibits the issuance of the seventh pulse from the second output of the former 11 (formation of a send signal) and allows it through the first output of the former. This signal as an overflow pulse of the counter 13 through the element OR 9 enters the installation in one state of the trigger 5, the high potential from the output of which through the element 4, opened at the second input by the high potential from the zero output of the trigger 7, appears in the computer on output 17 as Signal Ready to Receive ..

If the code of the symbol Point was received in the computer word from the computer, the decoder 10 will determine this before issuing it to the channel and deliver a pulse to driver 11,

which permits the issuance of a character Point, similar to the issuance of the last character from register 1. This exchanges with the channel ends and, on exit 17 in the computer, the Readiness for Reception signal is issued.

Thus, the device provides the formation of a machine word from the characters coming from the telegraph channel and back, which increases the throughput capacity of the interchange during the exchange.

Claims (2)

1. USSR author's certificate No. 266386, cl. G 06 F 3/04, 1970. 2. USSR author's certificate number 477409, cl. G 06 F 3/04, 1975 (prototype).