User's Manual

Cabinet Cabling
– continued
DRAFT
SC
TM
4812ET RF and Power Cabinet Hardware Installation Manual
Apr 2001
V04.03
94
Alarm Signal
Specifications
Function
ALARM connections provide Customer Defined Alarm Inputs and
Outputs. The customer can connect RF Cabinet site alarm input sensors
and output devices to the RF Cabinet, thus providing alarm reporting of
active sensors as well as controlling output devices.
Connections
Table 5-6 describes the characteristics and requirements for the inputs
(each of which consists of a single 2–wire pair) and outputs (each of
which consists of two 2–wire pairs; COM–NC and COM–NO).
Table 5-6: External Alarm Connector Characteristics and Requirements
Inputs Outputs
To ensure proper operation, each wire pair to be used
must be connected to an external transducer that
provides a dry contact.
– A closed contact including cable resistance must
be 1K ohms or less.
– An open contact including cable leakage must be
50K ohms or greater.
Either of the above states can be defined by the
customer in system software as an alarm condition.
The customer output device control inputs connect
between the common (COM) and either the normally
closed (NC) or normally open (NO) contacts of a
relay.
– Relay contacts are load rated for a maximum of
1A @ 30V DC and 1A @ 30V AC resistive.
The toggling of the relay contacts to the opposite
state is controlled by system software.
Alarm and Span Line Cable
Pin/Signal Information
Table 5-7 lists the complete pin/signal identification for the 50–pin
punch block.
5