Off-highway equipment for CAT and Perkins will use a slightly different 9-pin cable, which has a modification to the center pin. This is the correct cable for those applications. The DrewLinQ CAT cable will not read the CAT proprietary datalink (Called the CDL protocol). It does read all other protocols on CAT off-highway equipment, such as J1708, J1939, ATA, and J1587.
Drew Tech CAT Off-Highway 9 Pin Cable for DrewLinQ