As an option of the CEA-709 standard, collision detection is supported through an active low Collision Detect (CD) input from the transceiver.
The Collision Detection source can be either external (See “I/O Lines Description”) or internal. The collision detection source selection is defined through US_LONMR.LCDS.
The Collision Detection feature can be activated through US_LONMR.COLDET. If the collision detection feature is enabled and CD signal goes low for at least half tbit period then a collision is detected and reported as defined in “comm_type”.