GAI-Tronics 393-001AD, RED ALERT Auto-dial Telephones - Manual (Page 21)

P UB . 42004-472B
A UTO -D IAL T ELEPHONE M ANUAL P AGE
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Auxiliary Control Example: Output 4, Used for Gate Entry
A Model 393-001AD RED ALERT ® Auto-dial Telephone is installed at the entrance to a gated/secure
community. A visitor or delivery person approaches the gate and presses the CALL push button, which
automatically calls the security office. Upon verification of approved entry, the security guard presses the
pre-programmed, DTMF “open gate” command. This command causes the RED ALERT
® telephone’s
Output 4 relay contact to close for a pre-programmed amount of time then release. The RED ALERT ®
Telephone will acknowledge acceptance of this deactivation command with a short beep. If the beep is
not initially received, retry the command.
Since the contact is rated at 125 mA, an interposing relay will be required that, when energized, will
switch a higher voltage to a gate solenoid and cause the gate to open. Refer to Figure 13 below.
Figure 13. Example of RED ALERT ® Telephone Installed for Gate Operation
The output pulse duration (closure) and the DTMF code used as the “open gate” command are user
programmable. Refer to the “Standard Mode Programming” section for key sequence program settings
on page 27.
Please note that TMA may be used to change the contact closure settings, if the RED ALERT ® Telephone
is operating in SMART mode.