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.
