A NMEA 2000 cable has 5 wires. The five wires in a NMEA 2000 cable are:
CAN_H: High-speed data signal wire for transmitting data.
CAN_L: Low-speed data signal wire for receiving data.
Power: Positive power supply wire for providing power to devices on the network.
Ground: Negative power supply wire for completing the power circuit.
Shield: Protective wire that helps to reduce electromagnetic interference (EMI) and radio frequency interference (RFI).
The CAN_H and CAN_L wires are twisted together to reduce interference and improve signal quality. The power and ground wires provide power to the devices on the network, while the shield wire helps to prevent signal interference from other electrical systems.
