Chapter 1 Introduction 1-3
Chapter 1
Connectivity and Programming
ADAM modules can connect to and communicate with all computers and
terminals. They use RS-485 transmission standards, and communicate with
ASCII format commands. The command set for every module type consists
of approximately ten different commands. The command set for input
modules is larger because it incorporates alarm functions. All communica-
tions to and from the module are performed in ASCII, which means that
ADAM modules can be programmed in virtually any high-level language.
RS-485 Network
The RS-485 network provides lower-noise sensor readings, as modules can
be placed much closer to the source. Up to 256 ADAM modules may be
connected to an RS-485 multi-drop network by using the ADAM RS-485
repeater, extending the maximum communication distance to 4,000 ft. The
host computer is connected to the RS-485 network with one of its COM
ports through the ADAM RS-232/RS-485 converter.
To boost the network’s throughput, the ADAM RS-485 repeaters use a
logical RTS signal to manage the repeater’s direction. Only two wires are
needed for the RS-485 network: DATA+ and DATA-. Inexpensive
shielded twisted pair wiring is employed.
Panel/DIN Rail mounting
ADAM modules mount on any panel, on provided brackets, on DIN rails
or may be stacked together.
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