ADAM-4000 Series User Manual 2
1.1 Overview
The ADAM Series is a set of intelligent sensor-to-computer interface modules con-
taining built-in microprocessor. They are remotely controlled through a simple set of
commands issued in ASCII format and transmitted in RS-485 protocol. They provide
signal conditioning, isolation, ranging, A/D and D/A conversion, data comparison,
and digital communication functions. Some modules provide digital I/O lines for con-
trolling relays and TTL devices.
Software Configuration and Calibration
By merely issuing a command from the host computer, you can change an analog
input module to accept several ranges of voltage input, thermocouple input or RTD
input. All of the module’s configuration parameters including I/O address, communi-
cation speed, HI and LO alarm, calibration parameters settings may be set remotely.
Remote configuration can be done by using either the provided menu-based soft-
ware or the command set’s configuration and calibration commands.
By storing configuration and calibration parameters in a nonvolatile EEPROM, mod-
ules are able to retain these parameters in case of power failure.
Watchdog Timer
A watchdog timer supervisory function will automatically reset the ADAM modules in
the event of system failure. Maintenance is thus simplified.
Power Requirements
Although the modules are designed for standard industrial unregulated 24 V
DC
power
supply, they accept any power unit that supplies power within the range of +10 to +30
V
DC
. The power supply ripple must be limited to 5 V peak-to-peak, and the immediate
ripple voltage should be maintained between +10 and +30 V
DC
.
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 com-
mands. The command set for every module type consists of approximately ten differ-
ent commands.
The command set for input modules is larger because it incorporates alarm functions.
All communications to and from the module are performed in ASCII, which means
that ADAM modules can be virtually programmed in 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 which extends the
maximum communication distance up to 4,000 ft. The host computer is connected to
the RS-485 network with one of its COM ports through the ADAM-452x module (RS-
232 to RS-422/485 converter).
To boost the network’s throughput, ADAM RS-485 repeater uses a logical RTS signal
to manage the repeater’s direction. The only two wires that are needed for the RS-
485 network, DATA+ and DATA-, are inexpensive shielded twisted pair.
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