Analog interface circuits for process controllers and process mo

Details Analog interface circuits for process controllers and process mo Analog interface circuits for process controllers and process mo

1994-04-08

1995-05-16

Logan, Sharon D.

Coded data generation or conversion

Digital code to digital code converters

Data rate conversion

341110, 341141, H03M 700, H03M 100

Patent

active

054164800

ABSTRACT:
An interface circuit for use with process controllers permits analog signals to be input to a process controller through a binary interface of the process controller and permits analog signals to be output from the process controller through the binary interface. The input analog signal is converted to a digital sample of N bits. An identification pulse and the N bits of the digital sample are transmitted to the process controller at a rate selected for compatibility with the scan time of the process controller. The process controller includes a software routine for recognizing the identification pulse and the N bits of the digital sample. An equivalent approach is used for outputting analog signals through a binary interface of a process controller. The interface circuit can include multiple channels for inputting or outputting multiple analog signals.

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Data Sheet for AD7893, LC.sup.2 MOS 12-bit Serial 6 .mu.s ADC, Analog Devices, 12 pages.

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