There are several USB and power supply connections, as follows:
12 Volt Systems
CPT = Credit Card Terminal
DP = Deskpad or RFID Pad
(Note: Plug into the main board next to the Network Port)
LED, Blue LEDs
PC = Computer
TS = Touch Screen
BC = (Note: Plug this into the blue 3.0 port on the computer)
24 Volt Systems
CBA = Vending Device Motherboard
CU = Extension for Case Controller
IOB = Green LED Control for Vending Devices
PRT = Receipt Printer (Note: Plug this into the blue 3.0 port on the computer)