88
MDS™ Master Station
MDS 05-6399A01, Rev. E
Table 6-14. Alarm Modules
Part Number
Description
System
Interfaces and Indicators
Alarm/Audio Connector
Both versions of this module provide user connections for external alarm dry contacts and four
wire audio.
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 Section 7.4 Replacing Modules for information on removal and in-
stallation.
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.
Table 6-15. Alarm Module LEDs
LED Name
Behavior
Meaning
ALARM MAJ.
RED
On—Major Alarm (Master Station)
ALARM MIN.
RED
On—Minor Alarm (Master Station)
ACT A
BLUE
On—Radio A Active
Off—Radio A Standby
ACT B
BLUE
On—Radio B Active
Off—Radio B Standby
Alarm/Audio Interface
The ALARM/AUDIO Interface on the Alarm/Relay module provides audio signaling and alarm
outputs as shown below.
AUDIO
:
•
4-wire audio circuits are connected to pins 1 through 4 as shown in Figure 9.
•
Terminals 1 and 2 are for transmit audio input with a nominal 600
Ω
impedance.
•
Terminals 3 and 4 provide receive audio output with a nominal 600
Ω
impedance.
•
Pin 5 connects to an external keying source. Shorting pins 5 to pin 7 can key the radio
when PTT LOW is configured in software. When PTT is configured high in software,
pulling PTT to 3.3V keys the radio.
The interface is compatible with an external VOX adapter, although this product features an in-
tegrated VOX circuit with digital threshold control. For applications using the external VOX
adapter, 12VDC on pin 6 can be used to power the external module.
ALARMS
:
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