What does the horizontal switch on the back of the Autoprom do?
The horizontal switch, called the bypass switch, switches whether the PC communicates with the AutoProm CPU or directly to the ALDL interface hardware. When the switch is towards the serial or USB port, the PC communicates with the AutoProm CPU. This mode is used for changing data in the emulation buffer, for acquiring A/D data, and for ALDL datalogging in “AutoProm” mode (TunerPro only). When the switch is switched away from the serial or USB port, the AutoProm is in bypass mode. This mode allows the PC to communicate directly with the car through the ALDL cable. This allows the AutoProm to function as a simple ALDL cable. Use this mode to communicate with your OBDI vehicle using most ALDL data acquisition software such as WinALDL, CarBytes, Datamaster, etc.
