9
RS-485 Wire Diagram
Pin 1: TxD-
Pin 2: TxD+
Pin 4: RxD+
Pin 3: RxD-
Figure 11: Point-to-point / 2-wire half-duplex
communication
USB to RS-485 RS-485 device
D+
D-
Figure 12: Point-to-multi point / 2-wire half-duplex
communication
USB to RS-485
RS-485 device
RS-485 device
RS-485 device
