Use the 8A MAX relay on the LPR Processing Unit to control the power to the in-vehicle computer. This way, the computer will receive power only when the ignition is on.
You must power the in-vehicle computer through the LPR Processing Unit’s auxiliary 8A MAX relay. The laptop and the LPR Processing Unit will both react to the vehicle’s ignition signal (after a programmable delay). The laptop will then run on its own battery (duration configurable in Windows).
The following diagram shows a typical installation where power for the in-vehicle computer is controlled by the LPR Processing Unit relay: