Document: LT0554
Vigilant BOWS Installation & Operation Manual
Issue 1.20
6 September 2012
Page 3-3
The Paging and Remote Audio sources each have an additional link as
per Table 3 to determine if the audio source is to override the
Alert/Evacuate tones or not.
Table 3. BOWS Interface Override Tones Links
Link Audio Source
Link Position
Operation
LK4
Paging
No
Tones override paging audio
(Factory default)
Yes
Paging overrides tones
LK5
Remote Audio
No
Tones override remote audio
(Factory default)
Yes
Remote audio overrides tones
Note that the Emergency PA Mic always overrides Alert/Evacuation
tones.
The Issue B boards also include an ACTIVE LOW link. This is used to
configure the ACTIVE input on the Remote Audio port as per Table 4. If
the ACTIVE input is open (not used) it will be inactive in either link
position.
Table 4. Remote Audio ACTIVE LOW Link
Link
Audio Source
Link Position
ACTIVE Input Operation
LK6
Remote Audio
No
-30V to +2V Inactive, +2V to +30V Active
(Factory default)
Yes
-30V to +1V Active, +1V to +30V Inactive
Note that on Issue A boards the ACTIVE input is always active High.
The BOWS Interface board has the following 3 volume adjustment
controls as listed in Table 5.
Table 5. BOWS Interface Volume Controls
Control
Name
Function
VR1
BM VOL
Background Music volume control.
VR2
RA VOL
Remote Audio volume control.
VR3
PC VOL
Paging Console volume control.
Note that the volume of the Emergency PA Mic is set by VR3 PA VOL on
the (master) T-GEN 50.
When an audio source is configured to „Override Tones‟ the audio source
is fed into the T-GEN PA Mic input, and therefore the output level will be
determined by both the volume control on the BOWS Interface board and
the PA VOL (VR3) on the master T-GEN 50. It is therefore recommended
to set the master T-GEN Emergency PA Mic level (VR3) first (if required)
before adjusting the volume controls on the BOWS Interface board.
Override Tones
Links
ACTIVE LOW
Link
Volume
Controls