On-line serial communication interface from a transmitter to a c

Details On-line serial communication interface from a transmitter to a c On-line serial communication interface from a transmitter to a c

1985-08-12

1986-08-19

Caldwell, Sr., John W.

Communications: electrical

Systems

Selsyn type

34087019, 34087039, 323318, H04M 1104

Patent

active

046072470

ABSTRACT:
A serial communication interface establishes communication between the microprocessor of a transmitter, to a current loop powered by a power supply. The microprocessor outputs an analog signal corresponding to a process variable and also outputs a serial communication voltage pulse signal. The analog signal is applied to a current regulating circuit which draws current from the power supply onto the current loop in an amount proportional to the process variable. A comparator has one input connected to the microprocessor for receiving the serial communication voltage pulse signal and another input for receiving a fixed selected voltage. The output of the comparator is connected to an input of the current regulating circuit in such a way so that a signal from the comparator is summed with the analog signal. The output signal of the comparator is modulated in synchronism with the voltage pulses and represents a fraction of the analog signal so that both signals can be supplied to the current loop simultaneously.

REFERENCES:
patent: 4016480 (1977-04-01), Hofmann
patent: 4413250 (1983-11-01), Porter et al.
patent: 4520359 (1985-05-01), Kitagawa et al.

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