DEVICE TO RECEIVE AND TRANSMIT D C SIGNALS OVER TWO-WIRE LINE

摘要

FIELD: electrical engineering. SUBSTANCE: reduced consumption power and increased noise immunity are obtained by exclusion of some elements of circuit and by insertion of couplings. Transmitter 2 has first 7 and second 8 transistors of different structure which bases are connected correspondingly to leads of first 9 and second 10 input resistors, collectors of first 7 and second 8 transistors are tied up together and connected to one of communication lines. Emitters of transistors are connected to proper supply buses. Receiver has first 11 and second 12 stabilizer diodes connected in series. Common point of stabilizer diodes is connected to common point of collectors of transistors of transmitter. Other electrode of first stabilizer diode II is connected to one lead of fifth resistor 13 and base of second transistor 14 of one structure. Other electrode of second stabilizer diode 12 is connected to one lead of sixth resistor 15 and base of third transistor 16 of other structure. Other leads of fifth 13 and sixth 15 resistors are connected to proper buses of power supply source to which emitters of first transistor 17 of one structure and fourth transistor 18 of the structure are connected. Collectors of these transistors are connected to emitters of second 14 and third 16 transistors correspondingly. Collectors of second transistor 14 of one structure and third transistor 16 of other structure are connected through third 19 and fourth 20 resistors to corresponding power supply buses and are simultaneously inputs of information processing unit. Base of first transistor 17 of one structure is connected through first input resistor 21 of receiver to first lead of second resistor 10 of transmitter. Base of fourth transistor 18 of other structure is connected through second input resistor 22 of receiver to first lead of first input resistor 9 of transmitter. Second communication line is connected to proper power supply bus. EFFECT: reduced consumption power, increased noise immunity with simultaneous simplification of design. 1 cl, 1 dwg