SU1481829A1 - Digital sygnal transmitter - Google Patents

Abstract

The invention relates to the transmission of discrete signals and can be applied in telemechanics systems and automated control systems. The purpose of the invention is to increase the functional reliability and speed of the device. To achieve this goal, linear switches are connected in a device in a ring, each of which is connected to the corresponding transceiver / telemechanic unit / by two communication lines, and one of the linear switches is connected to the starting and control unit. Such a construction allows speeding up the exchange of information between telemechanics units. 2 hp ff, 3 ill.

Description

one

The invention relates to the transmission of discrete signals and can be applied in telemechanics systems and automated control systems.

The purpose of the invention is to increase the functional reliability and speed of the device.

Figure 1 shows the structural diagram of the proposed device; 2 is a diagram of a linear switch; on fig.Z - block diagram of the launch and control.

The device (Fig. 1) contains linear switches 1, - 1 ", having input 2, output 3, input 4 and output 5, output 6 and input 7 of the starting and control unit 8, lines 9, - 9P communication, linear outputs 10 and inputs 11 of the telecontroller 12, - 12, which are transceivers, each of which has buses 13-18 for communication with subscribers, and information output 19 of the start and control unit 8.

Linear switch (figure 2) contains aural output 20, amplifiers 21 and 22, the integrator 23, the trigger 24, the switch 25 and the integrator 26.

Block 8 start and control contains the selector 27 clock pulses, the element OR 28, the integrator 29, the imaging unit 30, the element 31 and the node 32 of the control repetitions.

The device works as follows.

In the initial state, after energizing the linear switches 1 and the start and control unit 8, the latter generates a sync pulse and transmits it via this output 6 to the subscriber input 4 of the linear switch 1. Next, the sync pulse from the linear output 3 of the slay switch 1 goes to the linear input 2 of the next linear switch 1. Pass it in transit, the sync pulse goes to the next (L

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linear switch 1, etc. When the sync pulse arrives at the linear input 2 of the linear switch 15 of the serving start and control unit 8, it does not transit, and through the subscriber output 5 it is fed to the input 7 of the start and control unit 8. Then the clock pulse passes through its transit circuit and arrives with a delay equal to the duration of the clock pulse, again into the ring data network. At the same time, the clock pulse, the passage through the ring of the linear switches 1, goes to their subscriber outputs 5 and through the communication lines 9 to the inputs 11 of each block 12 of the telemechanics When the power is supplied to one of the transceivers (telemechanics unit) 12, the latter is connected to the ring network for transmitting digital signals data. The transceivers (remote control units) 12 are disconnected from the ring network in the same way, but in reverse order. If during the time until the next sync pulse is received at input 2 e at input 4 there is no sync pulse from line 9, then at the end of the second sync pulse trigger 24 switches switch 25, prohibiting the passage of digital signals from subscriber input 4 to linear output 3 of linear switch - the regenerator 1, thereby disconnecting the transceiver (remote control unit) 12 from the network of transmitting digital data signals, connecting the input 2 through the switch 25 to the output 3.

Let several telemechanics units 12 be turned on and the first subscriber wants to send a message to subscriber N. Receipt to the first subscriber via communication bus 14 of the corresponding telemechanical service signal block Ready Allows the subscriber to send a message from the subscriber exposes transmission signal on the communication bus 13 and starts entering the message over a bidirectional communication bus 16. The recording is made on the inputs 15. Entering messages the address of the subscriber’s telecontrol unit 12 is N, the sender’s address code is its own address and then data with an arbitrary message length. After entering the last data word, the first subscriber removes the Transmit signal and the telemechanics unit 12 (sender) starts searching for the moment of release of the communication line. If the busy bits are not immediately followed by the busy bits as a logical unit, then the link 9 is free to transmit the message. A telemechanics unit 12 (sender) transmits to communication line 9, following a sync pulse, one busy bit, and then the entire message, 5 which ends with a single bit busy sync pulse.

The message passes successively the communication line 9, the linear switch .1 and so on through the transit circuits of the included-blocks 12 telemechanics and the start-up and control unit 8.

Q Each transceiver included

(remote control unit) 12 compares the address code of the recipient (the first 16 bits after the sync pulse) in the signal passing through it with its

5 own address. If the address in some block matches, then this remote control unit 12 (receiver) writes a message to the receiving memory from communication line 9 and simultaneously passes it through the transit circuit to the sender. At the end of the message, before the second sync pulse, the telemechanics unit 12 (the receiver) transmits its dres-receipt that it has received the information.

5 The telemechanical unit 12 (sender) compares the transmitted message returned to it, checks the recipient's address and closes the transit circuit. In the case of a match in the telemechanics unit 12 (sender) of the message and receipt, the unit transmits the receipt-code of the recipient's address and releases the output 6. Having received only his address, i.e. Once the decision is issued, the recipient starts issuing a message to the subscriber. The session is over.

If at least one bit in the message or in the receipt does not match, block 12

0 telemechanics free line 9

communication, transmitting a clock pulse without an occupation bit to it. Then, when the syn5 pulse without a bit of occupation comes to this transceiver (remote control unit) 12 again, it returns to the transmission. When the number of "re-transmissions greater than a given block 12, the telemechanics stops

the lowest gears. If the address of the receiver in the communication line did not coincide with any of the own addresses of the included transceivers (remote control units) 12, the sender does not receive. The receipt from the recipient, which is similar to the case of a mismatch between the sent and received message, the sender releases the communication line 9, then re-transmits the message and stops the transmission after a specified number of repetitions.

During device operation, the startup and control unit 8 controls the presence of a clock in the data network. If the sync pulse is not longer than the transmission time of one of the longest message, then the starting and monitoring unit 8 generates and transmits a new trigger sync to the data network. If it transmits the clock pulses repeatedly and they are not returned to its input a specified number of times, then the general signal, Avari, is output to output 19.

The linear switch 1 operates in two modes: with the transceiver turned on (remote control unit) 12, which it serves and with the remote control unit 12 turned off or the remote control 9, which connects the linear switch 1 with the corresponding remote control unit 12.

Linear switch 1 operates as follows.

When a signal arrives at the line input 2, the integrator 26 selects a clock pulse arriving at the counting input of the double trigger 24. The latter counts one pulse. At the same time, the signal or only one free sync pulse through the transmitting amplifier 21, output 5 and the communication line 9 is fed to the line input 11 of the transceiver (telemechanics unit) 12. Pass the transit circuit of the telemechanics unit, the signal from its output 10 through the communication line 9 goes to the subscriber input 4 of the device, in which through the receiving amplifier it reaches the first integrator 23. The sync pulse allocated by it resets the trigger 24 to the initial position, at which the switch 25 controlled by it remains in a state

2 signal input and running condition

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wherein all signals from subscriber input 4 restored and formed by receiving amplifier 22. pass through switch 25 to line output 3 and to the data network. Thus, in the operating mode, the trigger 24 continuously counts the unit when it arrives at

is reset to use after this signal arrives at subscriber input 4. In this case, double flip-flop 24 does not overflow and the switch 25 remains in the state of passing signals from subscriber input 4 to line output 3, and output 20 remains the On signal.

In case the telemechanics unit 12 is turned off or the communication link 9 is faulty or broken, the signal from subscriber output 5 does not return to subscriber input 4 and the trigger

24 stays in position 1. When the next clock pulse arrives, it is allocated by integrator 26, switches double trigger 24 to position 2, the overflow signal of double trigger 24 switches the switch

25B, the position of the direct signal passing from the linear input 2 to the linear output 3, the output signal is switched off from the output 20. Naturally, turning off one of the 12 telemechanics units at the moment when the other transmits information without receiving a receipt will repeat the transmission, the linear switch 1 by this time will switch off the direct signal passing

and the subscriber will receive a message with a delay of no more than the duration of one message (from one sync pulse to the second).

Unit 8 start and control works as follows.

When the supply voltage is applied to the blocks of the device, after some time, the integrator 29 is triggered in the start-up and control unit 8, and a signal is sent to the input of the synchronizer driver 30 from the integrator 29 output, which triggers the synchronizer driver 30. The generated sync pulse goes through the OR 28 element to the input of the integrator 29, its capacity is discharged, and through the second OR 31 element to the output 6 of the starting and control unit 8, and then to the data network. With

after some time, a message or a sync pulse arrives at input 7, which through the second element OR 31 passes to output 6 of the start and control unit 8 and then to the data network. At the same time, the selector 27 clock pulses through the first element OR 28 feeds to the input of the integrator 29 a dedicated clock pulse. The continuous flow of the clock pulses to the integrator discharges the capacitor of the integrator 29 and the signal at its output does not reach the start value of the driver of the 30 clock pulses. A dedicated clock pulse also arrives at the installation input of the repetition control unit 32, setting it to its original position.

In the event of a data network violation, if during the time equal to the time of the longest message passing through the data network with all the telemechanics 12 turned on, the next clock pulse does not arrive at the input 7 of the start and control unit 8, then the capacitance time to charge integrator 29, and shaper 30 sync pulses outputs the following sync pulse. If the clock pulses are still not received at the input 7 of the start and control unit 8, the clock generator 30 controlled by the integrator 29 outputs the clock pulses continuously, and the repetition control unit 32 counts them without resetting by the installation input. Through a predetermined number of sync pulses, the output of Avari is signaled to output 19 from it.

Claims (3)

1. A device for transmitting digital signals, comprising transceivers, whose information inputs are device information inputs, linear switches, the first inputs and first outputs of which, besides the last, are connected to the first terminals of the respective communication lines, the trigger and control unit, the fact that, in order to increase the functional reliability and speed of the device, the linear input and the linear 0 50 five five 0 the output of each transceiver is connected to the second output of the corresponding communication line, the second output of each previous linear switch is connected to the second input of the subsequent one, the linear input and the linear output of the launcher are connected to the first output and to the first input of the last linear switch, and its information output is informational device output. 2. The device according to claim 1. characterized in that the linear switch contains integrators, amplifiers, a switch and an RS-flip-flop, the input of the first amplifier is the first input of a linear switch, the output of the first amplifier is connected to the first information input of the switch and through the first integrator is connected to the first input of an RS-flip-flop, the output of which connected to the control input of the switch, the output of which is the second output of the linear switch, the second information input of the switch is the second input of the linear switch, combined n to the input of the second amplifier and through a second integrator connected to the second input of the RS-trigger, the output of the second amplifier is a first output of the linear switch. 3. The device according to claim 1, characterized in that the launch unit and the control contains a clock selector, a repetition control node, a clock generator, an integrator and OR elements, a sync pulse selector input combined with the first input of the first OR element and a linear input of the start and control unit, the output of the clock selector is connected to the first input of the control node repetitions and to the first input of the second element OR, the output of the repetition control node is an information output of the start-up and control unit, the output of the second element OR through serially connected integrator and clock generator connected to the second inputs of the control unit repeats the first and second OR elements, the output of the second OR gate output is a linear run unit and with control one Vf51 N cS “§ with see f V JfiS i 11 -j -Tj -A I rh Have t .J, one w "five A $ Ji " Cli / V one YU h W / V 4h "C5, YU - "ABOUT i i "SJ CSJ „J csi / V ro YU four BS d & / Krishnodp ur / Isnanod and 29 2B thirty FIG. 2 27 j; J2 nineteen