Entry:
The vehicle approaches the entrance and driver places the coded
card into card reader or punches digital keypad. This creates
an impulse which actuates the automatic gate operator and opens
the gate.
As the vehicle goes through the opening, it passes over the
"outer loop" and "inner loop," creating
an impulse to hold the gate open. When the loops have been cleared,
the timer, after a pre-set period, sends an impulse to the automatic
gate operator to "close" the gate.
If the gate is closing as the vehicle reaches the loop area,
the gate reverses to the open position and the timer automatically
resets.
Exit;
From inside the fence line, the vehicle approaches the exit
and passes over the inner loop. This transmits an impulse to
actuate the gate operator and open the gate. As the vehicle
passes over the inner and outer loops, an impulse is transmitted
to hold the gate in an open position. When the vehicle clears
both loops, the timer, after a preset period, sends an impulse
to the automatic gate operator to "close" the gate.
