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8
VAD-4 Installation and Operation Manual
INSTALLATION
Telephone “CALLER” line output:
Balanced CALLER telephone line audio output is available between the CLR- and
CLR+ terminals. For unbalanced loads, use the "CLR +" and GND terminals only.
Do not connect the "CLR -" terminal to ground. Shields should be tied to the
“Chs Gnd” terminal.
PWR (Power):
The 12 VDC wall power supply is connected to the 2.1mm coaxial connector.
Telephone Line RJ-11 Jack:
Connect your central office “Loop Start” ONLY POTS line here.
This line
SHOULD be equipped with CPC (Calling Party Control, WINK or COD) to
function properly.
Mounting:
The VAD-4 may be set on a desktop, mounted on a wall or as part of a RA-1 mount-
ing shelf. Up to three units may be installed on one RA-1 rack shelf kit (filler panel
is provided).
Jumper Settings
JP3: DTMF Tone detection jumper (Guard time)
The VAD-4 is equipped with a 4-position jumper, labeled “JP3” on its PCB. This is
used to adjust how quickly DTMF tones are detected. The settings are as follows:
F = Fast, 50ms ON / 50ms OFF (default)
M = Medium, 100ms ON / 100ms OFF
S = Slow, 150ms ON / 150ms OFF.
Dip-switch setup
Some configuration settings on the VAD must be set via the 8-position dip-switch
package on the VAD’s printed circuit board. Please refer to the appendix for more
information.
DIP 1 - OFF = Normal operation / ON = BOTT mode.
For use with the BOTT Radio Network Only.
DIP 2 – OFF = Degrees Fahrenheit / ON = Degrees Celsius
(for polling only, alarms set separately.)
DIP 3 – ON = K5 relay closes on all alarms. (Alarm tally)
DIP 4 – 7 = Not used.
DIP 8 – OFF = Alarms enabled / ON = Alarms disabled
All dip-switches are set in the off position at the factory.
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