Alarm/Relay Toggle Switch (6847 Only); Alarm/Relay Rf Connections (6847 Only) - GE MDS Master Station Technical Manual

Terminals 8 and 9 provide solid state relay contacts that close when a minor alarm is
•
detected.
Terminals 10 and 11 provide relay contacts that close when a major alarm is detected. You
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can redefine these relay contacts using the radio's software (switched from minor to major
alarm outputs, or vice versa). The contacts are rated for non-inductive loads up to a
maximum 60 Volts (AC or DC) at 1 A.
Analog RSSI:
When enabled in software, an RSSI voltage of 0 to 3V corresponding to -120 to -70dBm is pre-
sent on this line.

Alarm/Relay Toggle Switch (6847 Only)

For redundant units, the Alarm/Relay module includes a manual override toggle switch, which
can be set into one of three positions to associate it with a particular radio. The toggle switch is
locking, and must be pulled out to change positions. Switch functions are as follows:
- Up — Radio A
- Down — Radio B
- Center — Automatic.
When the switch is set to Automatic, the active radio is determined by radio module presence
and alarm status.
the switch be set to A or B, as appropriate.
The non-redundant version of the Alarm Module does not include the Toggle Switch.

Alarm/Relay RF Connections (6847 Only)

For redundant systems, the Alarm/Relay module includes a RF Connections for both the A and B
Radio Module, and RF OUT. These are all Dual FAKRA-SMB connectors. RF OUT is switched
between Radio A and Radio B depending on the currently active radio. RF OUT is normally ca-
bled to the Duplexer tray faceplate, even on systems that do not include a duplexer. Redundant
systems come from the factory already properly cabled between the Radio Modules,
Alarm/Relay Module and Duplexer tray faceplate. Connectors are keyed to ensure proper orien-
tation.
Non-redundant systems using the 6848 Alarm Module do not include RF Connections.
MDS 05-6399A01, Rev. E
+12v
PTT
Rx Audio -
Rx Audio +
Tx Audio -
Tx Audio +
Figure 6-9: Alarm/Audio Connections
(As viewed from outside the radio)
If only one radio module is installed (A or B) it is recommended that
MDS™ Master Station
6 12 Analog RSSI
5 11 Major Alarm Contact
4 10 Major Alarm Contact
3 9 Minor Alarm Contact
2 8 Minor Alarm Contact
1 7 Ground
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