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05-4161A01, Rev. C
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Alarm Equipment Connections
If alarm equipment (lamp, sounding device, etc.) is to be used with the
station, make the appropriate connections to the rear panel
minals.
Figure 15. Rear Panel Alarm Contacts
(For use when two radios are installed)
The
terminals are "dry" (isolated) alarm contacts which close
ALARM
(connect to the alarm common) when the Switchover Logic Board
detects that operation has switched to the secondary radio. Figure 15
shows the connection state in the absence of an alarm condition—the
right pin is Normally Open (NO) and the left pin is Normally Closed
(NC), with respect to the Common terminal.
The alarm contacts are rated for the following service: 0.5 Ampere at
125 Vac or 1.0 Ampere at 24 Vdc. The common terminal in the con-
nector's middle "floats" and is not connected to ground or any internal
power supply voltage source.
NOTE: The alarm functions are intended for use with a fully-popu-
lated and enabled chassis (i.e., two transceivers, two power
supplies, and both power supply switches set to
panel switch should also be set to the
fault in the primary transceiver causes an automatic
switchover to the secondary transceiver. (It is this switchover
that applies power to the secondary radio, thereby causing the
alarm contacts to change state.)
Manual switchover to the secondary transceiver may also be
performed with the front panel switch, but it will immediately
cause the alarm contacts to change state, as a failure is assumed
in the primary radio.
Primary Power Connections
Connect input power to the power supply modules. See Figure 16
(AC units) and Figure 17 (DC units).
P21/P22/P23 Protected Network Station
Normally
Normally
Closed
Open
Alarm Common
AUTO
ter-
ALARM
). The front
ON
position so that a
19
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