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4.1 Rack Interface Input/Output (I/O) Modules
The two types of Rack Interface I/O Modules that are available for the 3500
Monitoring System are the RS-232/RS-422 I/O Module and the Modem I/O Module.
The features below are common to both I/O Modules.
The Rack Interface I/O Module must be installed behind the Rack Interface Module
(in a Rack Mount or Panel Mount rack) or above the Rack Interface Module (in a
Bulkhead rack).
1) OK RELAY: The OK Relay is
normally energized and
indicates whether the 3500
Monitoring System is OK
RACK RS-422: This
connector is used to daisy
chain to the next 3500 rack.
Up to 12 racks can be
daisy-chained together.
Only RS-422 can be used
for this connection.
2) EXTERNAL CONTACTS:
•
Trip Multiply
•
Rack Alarm Inhibit
•
Rack Reset
Section 4 - I/O Module Description
23
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