The airport system utilizes the door unit model SA-1606. The SA-1606 offers complete control of each opening including eight (8) modes of operation. Door Units SA-1606 features include the following:

	Liquid crystal display (LCD)
	Operates stand-alone (when off-line from the system network)
	Eight modes of operation:
	Card access only
	Card access and personal identification number (PIN)
	Card access and common access code
	No access
	Local bypass (key switch, push-button from location station, etc.)
	Remote bypass (from the computer of remote indicating control panel)
	Unique mode change capability changes active mode of operation automatically using a preprogrammed schedule (e.g. 12 noon door unit goes to a no access state, at 8 AM door unit goes to a card access and personal identification number state)
	Two (2) wire or fiber optic communication to the central computer - inexpensive to install and maintain
	Modular construction - easy to service
	Local annunciator output-built-in alarm function
	Recessed or surface installation
	Harsh environment package option
	Integral surge and power condition circuitry