2
Rev. (30-JAN-98) • RLM v4.7
© 1995-98 Automated Logic Corporation
Introduction
The R683 is a DDC module designed specifically for
controlling rooftop air handling units. The module can
be mounted directly in or on the rooftop equipment. A
single board provides the power circuitry,
microprocessor, and non-volatile memory. The R683
module has 6 digital outputs, 8 universal inputs, and 3
analog outputs.
The R683 module is a member of the I/O Hardware family
of control modules. Each module is capable of stand-
alone operation. All modules communicate with equal
authority on a "peer-to-peer" EIA-485 Control Module
Network (CMnet). A direct access port is provided for
diagnostic operations.
The R683 module can store a single Graphic Function
Block (GFB).
Specifications
Power:
24 VAC, 50-60 Hz, 20 VA (0.83 A) maximum.
Inputs:
One enhanced zone sensor port and 8 universal
inputs (thermistor/dry contact, 0-5 VDC, or 4-20 mA).
Digital Outputs:
6 relay outputs (Form A), 3 A max.
Analog Outputs:
3 analog outputs (0-10 VDC),
20 mA source capability.
Communication:
EIA-485 port for CMnet
communication. Baud rate: 9600 bps or 38.4k bps
(switch selectable). CMnet terminals are optically
isolated.
Status Indication:
LED indicators for visual status of
communication, errors, running, and all outputs.
Memory:
32k byte non-volatile read/write memory.
Protection:
Noise immunity provided by metal cover
plate, surge protection on network, inputs, and power
lines, arc suppression on relays.
Figure 1: R683 Front and Side View Dimensions
