 The Automatic telephone dialer is an instrument that can
automatically dial a fixed number of telephone numbers and deliver a message at each of
the telephone numbers, without the help of any operator. The telephone numbers and the
message can be stored by the user (in his own voice) and can be modified whenever
required. When this instrument is activated, it starts dialing the telephone numbers in
sequence and delivers the recorded message on each of the stored numbers. The system can
re-dial to take care of busy numbers. The system works on normal telephone line. It does
not need a dedicated telephone line. There are two types of Autodialers in the market -
One that uses electronic chip to record and play the voice message and the other one uses
the usual Cassette for this purpose. The electronic chip is the preferred one on account
of following :
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There is no fear of jamming of the tape |
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No deteriorating of performance with time because of
rubber belts getting weak |
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Requires very low current to operate since there are
no mechanical parts nor are there any motors that require heavier current. |
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Always the same quality of voice as the playing
speed is not dependent of the voltage of batteries. |
Salient Features of an Autodialer
 An Autodialer has small microcomputer that controls all
functions. The emergency dialer takes priority over all incoming phones and faxes. This
implies that the dialer cannot be disabled by keeping the line busy on which the dialer is
installed. The salient features of popular Autodialers are:
EPROM retains memory
permanently
Can be activated by
NO/NC contacts
Password protection
to guard against unauthorized use
Test dialing facility
Can re-dial upto 3
times
Can work on Tone and
Pulse telephone lines
Provision to activate
external alarm if tampered (alarm system not included)
Special protection
against lightning effects on telephone line
The Wired Autodialer is connected with wires to the main control unit whereas the Wireless
Autodialer does not use wired to connect to the Control unit. It is to be noted that in
both cases the connection to the telephone wires is by physical wires.
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