This is what i think the abbrev code for the c509 connector is,now this is just a guess so.
LUM =UKNOWN
RXDBG RECEIVE DEBUG
TXDBG TRANSMIT DEBUG (PERHAPS THE MICRO PROCESSOR AND CO PROCESSOR SENDS AND RECEIVES BUG ERRORS IN ITS CODE)
LDPCN= LASER DIODE POWER CONNECTION
CIDX= NO CLUE
RX0LD RECIVE 0 LOAD
TX0LD TRANSMIT 0 LOAD (ON OTHER PROJECTORS THE SWITCH INSIDE THE BULB BAY CAN HAVE 3.3V WHEN THE BULB IS NOT PRESENT AND 0 VOLT WHEN IT IS PRESENT OR SOMETIMES VICE VERSA)
LENBL= NO CLUE
LLITZ= NO CLUE
LDUP=NO CLUE
VP500=NO CLUE
LDOFF=LASER DIODE OFF