The Diablo Controls Hands-Free Automatic Vehicle Identifier System
Consists of an AVI Transmitter and an AVI ReceiverThe AVI System has many different uses and applications including Emergency Vehicle Access, Mass Transit, Shuttle Buses, Private Homeowner Access, Trucking Companies, Manufacturing Facilities, Fork Lifts, Airport Access, RaiL Cars, and many other applications.Depending on the type of application, the user can choose to have the AVI System “Hands Free” or manual.The AVI system is configured and tested at the factory, providing a true “Plug & Play” environment.  All codes are documented and saved at the factory to eliminate duplicate codes being used by existing customers.  The AVI system has Multiple Code capability allowing for greater versatility and security.The AVI Transmitter is potted in a thermal epoxy compound and is mounted to the underside of a fire apparatus, police car, bus, light-rail train, and many other vehicles.  When the vehicle approaches a gated area, the code is received by a loop buried in the ground ahead of the gate or barrier.The receiver is the “smarts” of the system.  It receives the coded message coming from the transmitter.  If the transmitted code matches the pre-programmed code stored in the receiver, a relay contact is closed and a red LED is illuminated indicating a valid code is being received. This signal is then passed on to a gate controller, which automatically opens the gate or performs some other security function.


Ordering Information

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AVI-X-1 = 1 code
AVI-X-2 = Dual codes


  • Over 19,000 codes to choose from
  • Can be programmed to transmit 2 different codes
  • Operates on 12 volts DC
  • Comes preprogrammed with the desired codes
  • No switches to set
  • Small profile, perfect for many installations
  • Responds to transmitters made by other manufacturers

Application Notes

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The AVI System has a variety of uses and applications including Emergency Vehicle Access, Mass Transit, Shuttle Buses, Private Homeowner Access, Trucking Companies, Manufacturing Facilities, Fork Lifts, Airport Access, Rail Cars, and so many more!

Cut Sheet

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AVI-X – click to download


Instructions & Specs

AVI-X-Install-Instructions  – click to downloadThe AVI-X is a dual code transmitter encased in rugged housing.  It can transmit up to 19,683 different codes using the standard Motorola code format.  Furthermore, it is compatible with existing systems.

There are two models available: the AVI-X-1 and the AVI-X-2.
The -1 model will constantly transmit its single code as long as power is applied to the unit.
The -2 model has an extra cable attachment to a switch normally mounted somewhere on the dashboard.   This model will transmit its primary code continuously unless the switch is pressed.  As long as the switched is pressed, the transmitter will transmit its secondary code.  When the switch is released, the transmitter will revert back to its primary code.

The transmitter is typically attached to the under carriage of the desired vehicle and the two wires are hooked into the switched DC power source usually located some place on the dashboard.

The transmitter comes factory preset with the programmed code(s) installed.  The code(s) are easily changed if necessary.  However, for security reasons, this must be done by the factory.  Please contact the factory for any programmed code changes.

Voltage:  12 VDC (10 to 15 volts DC) protected from momentary overvoltage and/or voltage reversal.

Current:  20 to 80 mA depending on the code

Frequency:  375 kHz and complies with FCC part 15 for unlicensed operation

Codes:  Any two codes between 1 and 19,683 using the standard Motorola trinary format

Transmission Speed:  Code is transmitted once every 15 ms

Operating Temperature:  -30°F to 140°F (-34°C to 60°C)

Humidity:  100% relative humidity

Fuse:  Recommend adding 1A fast-acting fuse prior to cable attachment points (Not included)

Power Cable:  20’, two conductor cable

Base: 4.5” diameter x 1.0” high
Bolt: 4.5” high
Weight: 17 oz

AVI-X-Install-Instructions – click to download