SU1142898A1 - Start-stop transmitting device - Google Patents

Abstract

A TRANSMITTING START-UP DEVICE containing an information input unit, a clock generator, a start-stop message shaper, a control signal generator shaper, the first input of which is connected to the output of the comparator unit, the first input of which is connected to the first output of the register, characterized in that, in order to improve the noise immunity, a receipt signal receiving unit and a marker shaper are entered, the output of which is connected to the output of the start-stop package shaper and to the input of the receipt signal receiving unit, the output of which is connected to the second input of the control signal generator, the third input of which is connected to the input of the marker generator and the first output of the information input unit, the second output of which is connected to the second input of the comparison unit, the output of which is connected to the first input of the starting stop generator, the second input of which connected to the second output of the marker marker and to the fourth input of the control signal generator, the fifth input S of which is connected to the second output of the register, whose input is connected (L with the first output of the driver of control signals, the second output of which is connected to the input of the clock pulse generator, the output of which is connected to the clock input of the driver of control signals, the third output of which is connected to the third input of the driver of start-stop packets.

Description

1 The invention relates to telecom communications and can be used in telemechanical systems and digital automation systems. 1 A start-stop transmitter is known, which contains a shift register, the clock input of which is connected to the output of the clock pulse generator, ow, the input of which is connected to the input of the dialer, with the first input of the RSHI element and with the additional output,. OR, whose inputs are connected to the outputs of the shift register, the second input of the I-fflH element is connected to one of the outputs of the shift register C13. However, this device is characterized by insufficient reliability. The closest technical solution to the invention is a transmitting start-stop device containing an information input unit, a clock pulse generator, a start-stop message shaper, a control signal generator, the first input of which is connected to the output of the comparator unit, the first input of which is connected to the first register output C2. However, the known device has low noise immunity. The purpose of the invention is to improve noise immunity. This goal is achieved by the fact that the transmitting start-stop device containing an information input unit, a clock generator, a shaper of a stop wizard, a shaper of control signals, the first input of which is connected to the output of the comparison unit, the first input of which is connected to the first, the generator output, a receipt signal receiving unit and a marker shaper are entered, the first icoToporo output is connected to the output of the start-stop sending generator and to the input of the receipt signal receiving unit, the output of which is connected to the second At the input of the control driver, the signals, the third input of which is connected to the input of the marker and the first output of the information input unit, the second output of which is connected to the second input of the comparison unit, the output of which is connected to the first input of the driver of the start-stop parcels, the second 8 input of which connected to the second output of the marker generator and to the fourth input of the driver of control signals, the fifth input of which is connected to the second output of the register, whose input is connected to the first output of the converter yn: equal signals, the second output of which is connected to the input of the clock pulse generator, the output of which is connected to the clock input of the driver of the control signals, the third output of which is connected to the third input of the driver of the start / stop loop. Figure 1 shows a structural electrical circuit of the proposed device; Fig. 2 shows a structural electrical -circuit of the driver of control signals V in Fig. 3 codogram generated by the device. The proposed transmitting start / stop device contains information input unit 1, comparison unit 2, register 3, control signal generator 4, marker marker 5, driver start start generator 6, receipt signal receiving unit 7, 8 pulse pulses generator. The first control signal generator , the second, third and fourth triggers 9-12, first, second, third and fourth elements AND 13-16, first and second delay elements 17 and 18, amplifier 19. The device works as follows. The codogram (FIG. 3) is generated by the device and enters the communication line. The codogram includes: marker pulse (Fig. 3a), marker interval -i., Pulse start 1 and stop 1 (Fig. 36, c), limiting the information time interval im and sending start 2 and stop 2 (Figg, d), limiting the control time interval i. Between the Stop 1 and Start 2 pulses there is a delay time -tj. The control command is formed in the information input block i and is fed to the input of the comparison unit 2 as a parallel binary code. At the same time, from the first output of the information input unit 1, a signal is transmitted. Transmitting to the driver 4 control signals per trigger 11 AND to the driver 5 of the marker. By this signal, the trigger 11 goes into a single state and the pulse from its output goes to one of the inputs of the element I 13, a circuit of the command Stop 1 is prepared, and the driver 5 of the marker puts a marker pulse in the form of a positive polarity into the communication line, given amplitude and duration.,

After a time corresponding to i ,, the signal from the second output of the marker maker 5 is fed to the driver 4 of the control signals and the driver 6 of the start / stop parcels. The latter causes the Starting 1 pulsed dressing to the line. The signal received on the driver 4 of the control signals from the output of the generator 5 of the marker transfers the triggers 9 and 10 to one state, and the trigger 12 to the zero state. The trigger 9 provides power to the generator 8 clock pulses, and the trigger 10 through the element 14 provides pulses from the generator 8 clock pulses to the input of the register 3. The trigger 12c of the inverse output triggers a single signal to the element 16, preparing the repetition circuit. the case of the lack of a receipt signal from the receiving side, indicating the correctness of the reception of information. The pulses of the generator 8 clocks fill register 3. The information from register 3 in the form of a parallel binary code is fed to the input of comparison unit 2, to another input of which the binary command code from information input block 1 has previously arrived

At the moment of matching of the code combinations coming from information input block 1 and register 3, block 3, comparison block 2 generates a stop signal 1 on the start-stop send generator 6 and on the trigger 10 and the AND element 13. The start-send send generator 6 forms zi impulse message Stop 1 -negative polarity, limiting the information time interval t ,,. The trigger 10 goes to the zero state and removes a single signal from one of the inputs of the element 14, which

leads to the disconnection of the register 3 from the generator 8 clock pulses. A state earlier in the signal. The transmission to the second input of the element 13 has been given a single signal from the output of the trigger 11, the element 13 gives a signal to the delay element 17, which has two different outputs. Through the delay time -tj, the delay element 17 from the first output causes the Start 2 signal to the driver 6 start-stop packages and to the triggers 9, 10 and 12. The driver 6 start-stop packages sends a Start 2 pulse of positive polarity to the communication line, limiting the delay interval. In this case, the flip-flop 9 remains in one state, the flip-flop 12 is in the zero state, and the flip-flop 10 goes into the one state and, through the element 14, re-connects the register 3 to the output of the generator 8 clock pulses. From the second output of the delay element 17, the signal enters the trigger 11 and puts it in the zero state, which leads to the removal of a single signal from the input of the element 13 and the disconnection of the delay element 17. The single signal from the inverse output of the trigger 11 enters the input of the element And 15, preparing the signaling circuit Stop 2. Register, 3 continues counting pulses until overflow. The overflow signal springs from the second output of register 3 to element 15, trigger 10, and delay element 18. On this signal element 15 also commands stop 2 to driver 6 start-stop packages, which generates a stop-2 pulse of negative polarity in the communication line. The trigger 10 goes to the zero state and through the element 14 switches off the input of the register 3 from the generator 8 clock pulses.

In the event that a receipt is received from the receiving side to the receipt receiving unit 7, a receipt is received that indicates the correctness of the reception of information, a signal is sent to trigger 12. Trigger 12 goes into one state and sends a reset signal to all elements of the device. The transition of the trigger 12 to one state will lead to the removal of the signal from its inverse output, connected to the input of the element I 16, and the disconnection of the circuit to repeat the transmission. In the absence of the signal of the receipt, trigger 12 remains in the zero state, and delay element 18 outputs a single signal to the input of the element 16. The latter issues a command to repeat the transmission, since the second input of the element 16 gives 8 a single signal from the inverse output of the trigger 12. The proposed device allows to increase the noise immunity due to the exclusion of both static noise, y: ask and interference during the formation of the delay interval and the control time interval.

FIG. 2

Claims (1)

A TRANSMISSION STARTSTOP DEVICE comprising an information input unit, a clock pulse generator, a start-stop signal generator, a control signal generator, the first input of which is connected to the output of the comparison unit, the first input of which is connected to the 'first output of the register, characterized in that, in order to increase the noise immunity, 'a receipt signal receiving unit and a marker driver are introduced, the first output of which is connected to the output of the start-stop package former and to the input of the receipt signal receiving unit, the output which is connected to the second input of the driver of the control signals, the third input of which is connected to the input of the driver of the marker and the first output of the information input unit, the second output of which is connected to the second input of the comparison unit, the output of which is connected to the first input of the driver of start-stop toppings, the second input of which is connected to the second output of the shaper marker and with the fourth input of the shaper control signals, the fifth input of which is connected to the second output of the register, the input of which is connected to the first output shaper control signals, the second output of which is connected to the input of the clock generator, the output of which is connected to the clock input of the shaper of control signals, the third output of which is connected to the third input of the shaper start-stop packages.