An Automatic Vehicle Identification (AVI) system consists of an AVI transmitter, an optional AVI security device, a sensing loop, and an AVI receiver. The transmitter and receiver must be configured to use the same AVI code. Some transmitters are capable of transmitting more than one AVI code at a time or can change codes based on the state of a switch. The optional security device can be used to ensure that a transmitter will not work if removed from a vehicle (the transmitter and security device are permanently paired). The sensing loop is typically a coil of wire embedded in the driving surface. The sensing loop can be used as an inductive vehicle detection loop as well. Some receivers are capable of receiving more than one AVI code to activate its output.
The AVI-CR is a hand held unit used to verify the operation of AVI transmitters. Since most transmitters will already be mounted on a vehicle, the code reader is supplied with a sensing wand. The sensing wand has an extendable shaft that allows the unit to be compacted for storage. The handheld display unit can be used with or without the sensing wand and is capable of receiving up to four codes at once from the same transmitter.
The AVI-CR is delivered as four items:
Multiple Code Reception
The code reader capable of receiving up to four codes from a single transmitter. Each code must be sent a minimum of three times in a row before changing to a different code. The display will indicate the number of consecutive reads for each code being received.
The code reader will generate two audible beeps every time a new code is received. If a transmitter is transmitting two or more codes at the same time, the code reader will generate up to eight beeps (two for each code) when the codes are first received.
Battery Voltage Display
The code reader will display the actual battery voltage of the 9 volt battery in the display unit. When the battery voltage goes below six volts, a low battery message will be displayed in the battery voltage display area.
Extendable Sensing Wand
The code reader is provided with an extendable sensing wand. When extended, it allows the operator to easily position the sensing coil under a vehicle to check an installed transmitter. The sensing coil can be retracted and rotated 90 degrees for easy and compact storage.
Use without Wand
The display unit can be used without the sensing wand. When using just the display unit, get the unit with a foot or two of an operating transmitter to read the code. The actual read distance is dependent on the orientation of the display unit to the transmitter.
When the power button is first pressed, a splash screen will be displayed for one second that will identify the product and the firmware version.
Code Display Screen ￼
The code display screen is composed of several pieces of information: