This Could Be A Typical Installation

A. 3 button station. Open - Close - Stop (Typical Manual Control)
B. Remote transmitter similar to those used for garage doors.
C. Magnetic Inductance Loop. Detects the presence of a vehicle. Used as a Hold loop to interrupt the timer to close. This prevents the gate from closing on a vehicle.
D. Magnetic Inductance Loop. Detects the presence of a vehicle. Used as a Free Exit loop to open the gate allowing a vehicle to leave.
E. Pneumatic Edge. This stops and reverses the gate if the edge hits anything.
F. Photo Electric Device. Known as Photocells they maybe used as the Free Exit Loop to open the gate.
G. Photo Electric Device. Known as Photocells they maybe used as the Hold loop to interrupt the timer to close. This prevents the gate from closing on a vehicle.
H. Timer to Close. Located within the gate operator, this allows the gate to automatically close after a preset time has passed.
I. Card Reader. This utilizes a card to access the gate.
J. Keypad. This utilizes a Keypad with a numerical code to access the gate.
K. Key Switch. This utilizes a key to access the gate.

These are some typical controls which may be used in conjunction with a gate entry system. These are in no way the only types of controls. There are many more elaborate, and some more simple.

Each gate installation should be approached, and designed to fulfill what the end user is trying to accomplish. Frequently systems are designed without ever consulting the end user. A customers security is very personal. Discuss their goals and tailor their system to fit their needs.