SU1264348A2 - Device for transmission and reception of information via matched two-wire communication line - Google Patents

Abstract

The invention relates to radio and compared to the author. No. 1177914 extends the functionality of the device by detection; short circuits (short circuits) and wire breaks of communication lines SchLS). The device contains a receiver 1, a control unit 2, a pnp (pnp) -type 3 transistor, a pnp (pnp -n) -type 4 transistor, resistor 5, co-resistor fCP) 6, switch 7, current-generating unit 8, adjustments unit 9, voltage control unit 10, containing voltage dividers, comparators and this OR. In the absence of breaks and short-circuits, the 1st input of the unit 10 is supplied with a voltage equal to the sum of the loads of the stresses in W and C. 6 at the opposite end of the link. The voltages at the first inputs of the comparators of unit 10 exceed the voltage level at their 2 inputs, and there are no signals at their outputs. There is no signal at the output (L-th OR or at the output of block 10. If any of the wires in the 1st input of block 10 is broken, the voltage is almost equal to the voltage of the power source. Voltage to S 4 CO 4 00 fV)

Description

at the output, the divider is less than the voltage at the 2nd input of the 1st comparator. At the 1st comparator, a signal appears through the OR input to the output / block 10, indicating a break. In the case of a short-circuit fault, the voltage at the 1st input of the unit Yu is equal to the voltage drop in the fault voltage circuit to the fault point and lower in terms of the sum of the voltage drop in the fault voltage and on the CP 6 at the opposite end of the connection in the absence of a fault. The voltage at the 1st input of the 2nd comparator exceeds the voltage at eio the 2nd input. At its output, a signal is received, which is to-ry through the EL source or goes to the output of block 10 and indicates the presence of a short circuit. 1 3.p. f-ly, 2 ill.

The invention relates to radio engineering and communication, can be used to transmit digital information on wired communication lines and is an improvement of the invention according to author, no. 1177914

The purpose of the invention is to expand the functionality of the device by ensuring the detection of short circuits and wire breaks of the communication line.

Figure 1 shows a structural electrical circuit diagram of a device for transmitting and receiving information over a matched two-wire communication line; Fig. 2 is a structural electrical circuit of a voltage control unit.

The device contains a receiver 1, a control unit 2, a transistor 3 pp-p (pp-p) -type, transistor 4 pp-p (P1-pp) -type, resistor 5, a matching resistor 6, key 7, current carrying unit 8, regulating unit 9 and voltage monitoring unit 10, containing the first 11 and second 12 voltage dividers, the first 13 and second 14 comparators, and the OR element 15 A device for transmitting and receiving information on a matched two-wire communication line in the following way.

In the transmission mode of information from the output of block 2, a signal is received at which transistors 3 and 4 are closed. At the same time, the control input of the key 7 receives a signal at which the key 7. closes and at the output of the current-generating unit 8 a signal is closed, closing the regulating unit 9, and the voltage at the third input of the voltage control unit 10 is zero relative to its fourth input. At the second inputs of the first 13. and 14 comparators, the voltage is zero. Voltage

at the output of the second divider 12 is also zero, and there is no signal on the second comparator 14 at the second comparator 14. At the output of the first divider 11, a voltage is constantly set, which

less by a small amount of supply voltage. The voltage at the first input of the first, the comparator 13 is greater than the voltage at its second input, and

the output of the first comparator 13 signal is absent. There is no signal at the output of the element OR 15. The voltage and current in the communication line are absent in this mode, which corresponds to the information O.

In the transmission mode information 1 to the input of block 2 and to the control input of the key 7 receives a signal at which the key 7 is open, and to YO7

During the course of block 2, a signal appears that opens the transistor 3 and closes the transistor 4. In this case, the output of the current-generating unit 8 to the control input of the regulating unit 9 enters

a signal that establishes through the regulating unit 9 a current of a given level. The current flowing in this mode through the power supply wire of block 2 is several tens of times less than the current through the open transistor 3 and has practically no effect on the stability of the current in the communication line. If there is no wire break, a direct current flows through the communication line and the voltage corresponding to the information 1 is set at the opposite end of the communication line. At the third input 3 of the block 10, the voltage is close to the voltage of the power source and at the output of the second divider 12 a voltage is set to not more than the sum of the voltage drops in the wires of the communication line. If there are no breaks and short circuits of the communication lines, the first input of the unit 10 is supplied with a voltage equal to the sum of the voltage drops in the communication line wires and the matching resistor at the opposite end of the voltage line at the first inputs of the first 13 and second 14 comparators unit 10 exceeds the voltage level at their second inputs, there are no signals at their outputs, and, accordingly, there is no signal at the output, the OR element 15, and the output of the block 10. In the event of a break of any of the communication lines, the current through them stop on pen Yu th unit input set voltage substantially equal to the power source voltage. In this case, the voltage at the output of the first divider 11 is lower than the voltage at the second input of the first comparator 13, at the output of the comparator a signal appears that passes through the OR 15 element to the output of block 10 and indicates the presence of an open or short circuit of the communication line. In the case of a short circuit between the wires of the communication line, the first input of the unit 10 is set to a voltage equal to the voltage drop in the communication line wires to the short circuit point and smaller in terms of the sum of the voltage drops in the communication line wires and on the matching resistor end of the communication line in the absence of a short circuit. The voltage at the first input of the second comparator 14 in this case exceeds the voltage at its second input, at the output of the second comparator 14 | There is a signal that 1 through the OR 15 element is fed to the output of the control unit 10 and indicates the presence of open or short circuit wires communication lines. In the mode of receiving information, the input of the control unit 2 and the control input of the key 7 is given a signal corresponding to the informational O, at which the key 7 is closed and the output of the current holding unit 8 generates a signal that closes the controller 484. The main unit 9, and the output of the unit 2 receives a signal at which the transistor 3 is closed. At the third input of the control unit 10, a voltage is set to zero. The voltage corresponding to the information 1 coming from the communication line goes to the receiver 1 and through the resistor 5 is applied to the base-emitter junction of the transistor 4, which, opening to saturation, connects the terminating resistor 6 to the wires of the communication line. The voltage established at the first input of the block 10 when DC current flows through the open transistor 4 and the terminating resistor 6 is less than the voltage at the first input of the first comparator 13 and more than the voltage at the first input of the second comparator 14 of the block 10. Signals at the outputs of the first 13 and the second 14 comparators, respectively, and the output of the voltage control unit 10 are missing. Formula 1. A device for transmitting and receiving information on a matched two-wire communication line on the auth. No. 1177914, characterized in that, in order to extend the functionality by providing detection of short circuits and wire breaks in the communication line, a voltage control unit is inserted in it, the first input of which is connected to the emitter of the transistor p (p- 7), the second input of the voltage control unit is connected to the positive (power) of the power source, the third input of the voltage control unit is connected to the output of the key and the fourth input of the voltage control unit is connected to the negative (positive) power supply. 2. The device according to claim 1, wherein the voltage control unit comprises a first voltage divider serially connected, a first comparator and an OR element, as well as a second voltage divider and a second comparator sequentially connected, the output of which is connected to the second input of the OR element , while the second inputs of the first and second comparators are combined and are the first input of the aperture control unit, the second and third inputs are the first inputs, respectively, of the first and the second voltage inputs, the second inputs

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eri city 12643486 are divided and are the fourth in some of the houses of the voltage control unit.

Claims (2)

Claim 1. A device for transmitting and receiving information on a coordinated two-wire communication line on autosw. No. 1177914, characterized in that, in order to expand the functionality by providing detection of short circuits and wire breaks in the communication line, a voltage control unit is introduced into it, the first input of which is connected to the emitter of the transistor p-p-p (p-p-p) ; -type, the second input of the voltage control unit is connected to the plus (minus) of the power source, the third input of the voltage control unit is connected to the output of the switch and the fourth input of the voltage control unit is connected to the minus (plus) of the power source. 2. The device according to π. 1, characterized in that the voltage control unit contains a series-connected first voltage divider, a first comparator and an OR element, as well as a series-connected second voltage divider and a second comparator, the output of which is connected to the second input of the OR element, while the second inputs of the first and second comparators are combined and the first input voltage control unit, the second and third inputs, the first inputs of which are soot 1264348 ft $ ¹ respectively first and second divisors combined and the fourth consist: voltage, the second inputs of which the voltage control unit.