Interface module
The GenTL standard calls frame grabbers interfaces. The system module has one child interface for each frame grabber: if there are 2 Coaxlink cards in the computer, the system module will have two child interfaces.
Each interface represents a frame grabber. Global frame grabber features such as digital I/O lines belong in the interface module. This means that the GenApi features controlling the I/O lines are attached to the interface.
Each interface also acts as parent to one or several devices. The most important functions
of the interface module are IFGetNumDevices (to retrieve the number of
cameras that can be connected to the interface) and IFOpenDevice (to
get access to one of the devices).