United Security AVD-4040 User Manual

Page 13

Concept
The AVD-4040 is a combination of an Automatic Voice Dialer and a Remote Responder System (RRS) mounted inside
the same enclosure. The RRS shares the same 12V power source and

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with the dialer assembly. Other

than those

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, the RRS is uniquely configured to operate as an independent telephone receiver but without the

familiar voice operation. Instead, when called, it allows the user to communicate with it using keypad code sequences to
control up to four relay circuits for external interfacing with low voltage/current devices.

General Operation
In typical installations, the dialer is set up to respond to emergencies by sequentially calling user-programmed telephone
numbers along with a variety of outgoing voice messages (consult other sections of this manual for phone and voice pro-
gramming). In this case, for example, the dialer could be programmed to send specific voice messages requesting the au-
thorized user to remotely control alarm systems, lighting, etc., thus avoiding having to send personnel to perform those
tasks onsite. Once the dialer has completed its messaging cycle, the user then dials

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and by means of standard keypad sequences activates or deactivates any of four relay circuits inside the AVD-4040; indi-
vidual circuits are accessible through the back opening in the form of 4 four cable pairs (see drawing page 14).

RSS Operation
When called, after a preset number of rings, the RRS responds by sending a short sequence of high/low beep tones. Set-
ting the number of rings before the RRS responds is done by means of a 4-position switch located on the back of the
AVD-4040. Immediately after the high/low alternating confirmation tones, a 20-second timer is started during which the
user must complete key code operations to activate, deactivate, or pulse relay circuits. Letting the 20-sec timer expire will
cause the telephone line to be disconnected.

Note: It’s important to set the number of rings such that other telephone sets on the same extension are allowed to seize
the line before the RRS responds. For instance, setting the DIP switch on the back for 1 ring will result in the RRS seizing
the line in 6 seconds, which may be too short for other operators to respond to incoming calls. Selecting 2 rings would be
a better choice since it takes 12 seconds before the RRS seizes the line. For obvious reasons, an answering machine on a
shared line is incompatible with the RRS; the answering machine will never respond if the RRS goes off-hook first. Like-
wise, if an answering machine comes on first, the RRS will never respond.

Controlling individual relay circuits
When an incoming call is acknowledged, after hearing the high/low tone sequence, within 20 seconds, the user has the
option to individually control any of 4 relays circuits in accordance with steps 1 through 4 below. To prevent staying con-
nected, after 20 seconds, the RRS automatically goes back on-hook and stores relay circuit conditions up to that point in
time in non-volatile (EEPROM) memory. In the unlikely event that power is completely off after battery standby has run
out, relay circuits will assume the last memorized states when power is restored.

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