Sensor communication system

Details Sensor communication system Sensor communication system

H - Electricity

04

L

340/102, 340/162

H04L 27/00 (2006.01) G08C 15/06 (2006.01) H03G 1/00 (2006.01) H03K 7/08 (2006.01)

Patent

CA 1249356

APPLICATION OF T. B. BOZARTH, A. M. DEMARK, E. F. FINN AND F. LYNCH SENSOR COMMUNICATION SYSTEM ABSTRACT A sensor communication system uses a shared analog signal to duty cycle converter for producing a comparison between a predetermined free-running triangular waveshape and a selected output signal from a plurality of analog signal sources such as process sensors, to convert the amplitude of the analog signal to a variable duty cycle signal. The variable duty cycle signal is subsequently converted to a digital signal which may be represented by a count stored in a counter counting clock pulses during the occurrence of the pulse width waveshape of the variable duty cycle signal. The digital signal is utilized as a digital word by a microprocessor operating in accordance with a stored program to produce a characterized digital output signal for use in a communication after conversion to a 4-20 ma control signal for communication and control in an industrial process control system. One of the signal sources may be from a circuit having temperature and time drift components whereby the corresponding digital word is used by the micrcoprocessor to compensate the digital words from the other analog signal sources.

441670

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