User's Manual

74 MDS Master Station MDS 05-6399A01, Rev. D
6.5 Alarm and Alarm/Relay Modules
Figure 6-8 Alarm/Relay Module
(Part No. 03-6847Axx; 03-6848Axx)
There are 2 versions of the Alarm Module depending on whether the system is redundant or
non-redundant. The module pictured above is for redundant systems.
Table 6-14 Alarm Modules
Part
Number
Description System Interfaces and Indicators
03-6847Axx Alarm/Relay
Module
Redundant

RX/TX RF Connection for Radio A, Radio B,
and OUT.
 Relay to switch RF OUT based on active A or B.
 Toggle Switch to select active A/B or Auto
 Alarm and Active LEDs
 Alarm/Audio Connector
03-6848Axx Alarm
Module
Non-Redundant

Does not include RF Connections
 Does not include Relay
 Does not include Toggle Switch
 Alarm and Active LEDs
Both versions of this module provide user connections for external alarm dry contacts and four wire au-
dio.
NOTE: The Alarm or Alarm/Relay module does not support hot swappable field replacement; power
must be removed from the system before removal or installation of this device. Refer to 7.4 Replacing
Modules for information on removal and installation.
6.5.1 Alarm Module LEDs
The Alarm Module includes LEDs to indicate the active Radio Module (A or B) as well as the presence of
a Major or Minor Alarm.