Method for transmission of two signals through the three-wire direct current line

The invention relates to methods for transmission of two analog signals and can be used in connection interfaces during information transmission, in the measurement of resistance values of two thermisters or resistance strain gauges.The method for transmission of two signals through the three-wire direct current line includes the transmission of the analog signal from a transmitter to a receiver located on the communication line associated with the direct current line, by changing the resistance of the transmitter in two wires, while the third is a common wire, including in series the resistors of the two sets, consisting of four resistors each, three of which, with the conductancesof the first set andof the second set, are reference, and the fourth, with the conductancesand, of the first and second sets, respectively, is information and is calculated according to the transmitted signals, respectively, UC1 and UC2, at the same time it is set by the reference resistor with the conductancethe zero current through an arbitrary value of the conductance YS2 and by the reference resistor with the conductance- the value of conductance YS1. The method further includes reading by the receiver of values of the corresponding currents at the input and calculation of values of the transmitted signals UC1 and UC2 according to the appropriate sets of currents I3 and I4 atthe input of the communication line. Invenţia se referă la procedee de transmitere a două semnale analogice şi poate fi utilizată în interfeţe de comunicaţie la transmiterea informaţiei, la măsurarea valorilor rezistenţelor a două termo- sau tensorezistoare.Procedeul de transmitere a două semnale prin linia de curent continuu cu trei conductoare include transmiterea semnalului analogic de la un emiţător la un receptor, amplasate pe linia de comunicaţie asociată cu linia de curent continuu, prin variaţia rezistenţei emiţătorului în două conductoare, al treilea fiind un conductor comun, conectând consecutiv rezistoarele din două seturi, formate fiecare din patru rezistoare, trei dintre care, cu conductanţeledin primul set şidin al doilea set, sunt de referinţă, iar al patrulea, cu conductanţeleşi, respectiv, din primul şi al doilea seturi, este informaţional şi se calculează conform semnalelor transmise, respectiv, UC1 şi UC2, totodată se prestabileşte prin rezistorul de referinţă cu conductanţacurentul nul printr-o valoare arbitrară a conductanţei YS2 şi prin rezistorul de referinţă cu conductanţa- valoar