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18
VAD-4 Installation and Operation Manual
SPECIFICATIONS
SPECIFICATIONS
Control Logic:
Flash Microprocessor with non-volatile memory
Relays
Four user-controllable, one alarm tally- SPDT Contacts, 30
VDC @ 1 Amp maximum.
CAUTION! For safety, never connect 120 Vac circuits to these relays!
Status Inputs:
Four optically Isolated, RFI protection. Internal jumper for
(wet) external 5 to 24 VDC (higher voltages with external
resistor) or internal 5 VDC source (dry). Open collector,
contact closures to ground or external source.
Power Failure Input:
6 to 12 volts at 50ma DC coaxial (2.1mm/ID, 5.5mm/OD,
center positive) power source (user supplied).
Temperature Sensor Inputs:
Two sensor inputs. Sensors with 25-foot cables and 3.5mm
T/R/S plugs optional. -40°F to +190°F (-40°C to +85°C)
Stereo Silence Sensor:
Stereo unbalanced 10K ohm inputs. Trip level -25dBu.
Silence sensor level to Telco adjustable.
Balanced caller audio output:
0 dbu @ 100 ohms. Gain resistor (R31) may be changed to
increase the output level.
Telephone Line Connector:
RJ-11. Cable supplied. Fused and surge protected
Voice Record Phone Connector: RJ-11. Talk battery provided.
Connectors:
Plug-in euroblock screw terminals for status inputs, relays,
balanced telco audio output and stereo unbalanced silence
sensor inputs.
Power:
12 VDC @ 500ma. 2.1mm coaxial jack. Surge protected
universal input wall transformer supplied. Optional interna-
tional power plugs.
Size:
5.66" x 7.00” x 1.58", Painted aluminum chassis w/ 4 - 4-40
mounting holes.
Weight:
2.0 lb.
Options:
RA-1, Rack Shelf. 1 RU. (Holds THREE VAD-4’s).
Temperature Sensor.
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