To get a better understanding of a project, it would be helpful to review some of the terms and definitions used in gate systems.
Access Control - this refers to the actual control of a gate system.
Card Reader - an increased security system that requires a physical card presentation to activate the gate entry. Primarily used in commercial applications and as key pads offered in stand-alone, multi-use computer-generated systems.
Emergency Entry - a device that allows emergency vehicles onto the property. This is primarily used in commercial applications.
Free Exit - by the use of a loop or sensor, the gate would automatically open upon exiting the property.
Gates - this refers to the actual product at the opening. Material could be steel, aluminum, plastic, or wood. Size and type have many variations in design and have the option of swinging or sliding open.
Intercom System - allows voice communication to the gate by having a master station inside a structure and a sub-station at the gate. Normally, a release of the gate is also incorporated into this type of system. The intercom is less expensive in equipment costs but also has limited use possibilities. Distance and installation can present problems in some applications.
Knox Lock - similar to the Emergency Entry but uses only a security, non-duplicated key to open the unit.
Loops and Loop Detectors - an electromagnetic field installed in the driveway area to override the closing sequence of the gate to prevent striking a vehicle. Not required by UL325 (see definition below) in most residential applications, but mandatory in public use areas.
Magnetic Lock - designed to increase security of the gate, above built-in operator locks.
Operator - the operator is the master unit that moves the gate. There are a number of manufacturers on the market. Decisions on purchase would be relationship to the selection of the gate (material, slide, swing, size, weight, hard-wired or battery, etc.) and price point. There is a difference in quality and price with each manufacturer.
Photo Beam - a safety device now required at the gate threshold to prevent entrapment per UL325 (see definition below).
Radio Receiver - a receiver is the unit that allows remote access to the gate primarily from vehicles. Most radios can be matched to garage door units and most factory automobile transmitters.
Safety Edge - a switch attached to the leading gate edge that would stop or reverse the gate on meeting an obstacle.
Transmitters - the small device that signals the gate to respond to opening or closing commands.
Telephone Entry - the best approach to voice communications. This system ties the gate system in a telephone line or a cellular system. A wide variety of equipment on the market addresses all types of applications. These units can be tied to existing phone lines or have dedicated lines. The user at the gate calls pre-programmed numbers and the receiver completely controls the gate from the telephone to allow or deny entry. These types of units also allow the owner to open, close, and lock the gate through the phone and offer a key to access the property. Telephone entries come in many styles, shapes, colors, and number memory. Expanded and larger versions are designed for commercial applications.
UL325 - this is the controlling law that primarily addresses entrapment and safety of gate systems. US325 has a number of classifications which, simply stated, means a simple residential application would be governed differently from a more public or commercial project.
Weigand Radio - computer generated to allow radio transmitters to be used similarly to card readers.
