G - Physics – 08 – B
Patent
G - Physics
08
B
340/163, 354/97
G08B 1/08 (2006.01) G08C 19/02 (2006.01) H04L 25/02 (2006.01)
Patent
CA 1243750
ON-LINE SERIAL COMMUNICATION INTERFACE FROM A TRANSMITTER TO A CURRENT LOOP 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 inlet 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 to 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. -10-
510384
Bastijanic Edward
Sterling Edward L. Jr.
Babcock & Wilcox Company The
Ridout & Maybee Llp
LandOfFree
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