SERIAL COMMUNICATIONS EXAMPLE
-35-
PROCESS CONTROLLING SYSTEM
Six Model IMD1s with Serial Communication Option are
used to monitor and control humidity levels of six separate
greenhouses at an Agricultural Research and Development
Center. One IMD1 is located at each building. The
communication lines are run to a computer located in the
main office.
The drawing below shows the Current Loop set-up. Each
IMD1 is given an address and programmed accordingly
(Program Module #7). A baud rate of 1200 is selected.
An application program is written, which sends and
retrieves data from the IMD1s.
Note: On all IM indicators, the SO+ and the +20 mA SRC
are connected internally. Therefore it is not necessary to
have the +20 mA SRC terminal tied to any other terminal
on the unit if that unit is serving as the loop supply source.
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