GAI-Tronics 227-005 SMART Auto-Dial Handset Telephones - Manual (Page 24)

Pub. 42004-443C
SMART A UTO -D IAL H ANDSET T ELEPHONES P AGE
22 of 31
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Auxiliary Control Example: Output 4, Used for Gate Entry
A Model 227-005 SMART Telephone is installed at the entrance to a gated/secure community. A visitor
or delivery person approaches the gate and places a call to the security office. Upon verification of
approved entry, the security guard presses the pre-programmed, DTMF “open gate” command. This
command causes the SMART telephone’s OUT4 relay contact to close for a pre-programmed amount of
time then release. The SMART Telephone will acknowledge acceptance of this activation 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 12 below.
Figure 12. Example of SMART 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 “Phone Properties / Behavior” section in TMA.