G - Physics – 08 – B
Patent
G - Physics
08
B
340/163, 354/97
G08B 1/08 (2006.01) G08C 19/02 (2006.01)
Patent
CA 1243095
ON-LINE SERIAL COMMUNICATION INTERFACE FROM A CURRENT LOOP TO A COMPUTER AND/OR TERMINAL ABSTRACT OF THE DISCLOSURE An on-line serial communication interface is established from the transmitter of a two line current loop transmitter to a digital circuit such as a computer or hand-held terminal which receives and processes digital voltage pulses. The interface includes a comparator having a negative terminal connected by a capacitor to one of the current lines, and a negative terminal connected to a source of small positive voltage. The output of the comparator is connected to an input port of the digital device. The transmitter modulates the current on the current loop by a small amount with respect to the analog current communicated by the transmitter. This generates voltage pulses in the capacitor which are compared to the selected voltage and are amplified to form large voltage pulses used for digital communication with the computer or hand-held terminal.
510378
Sterling Edward L. Jr.
Thompson William L.
Babcock & Wilcox Company The
Ridout & Maybee Llp
LandOfFree
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