Moxa Technologies RS-485 Interface, CP-134U 4-wire RS-485, Connection Cables and Cable Wiring

Connection Cables and Cable Wiring

RS-485 Interface

The RS-485 standard is an enhanced version of the RS-422 balanced line standard. It allows multiple drivers and receivers to work on a multidrop network. A maximum of 32 drivers and 32 receivers can be set up on a multidrop network.

The CP-134U Series supports both 2-wire half-duplex and 4-wire full-duplex RS-485 communications. In 2-wire RS-485, Data+/- pins are used for both data transmitting and receiving, depending on the RTS signal.

CP-134U (4-wire RS-485)

	Port 1		Port 2		Port 3		Port 4
13	RxD+(B)	9	RxD+(B)	5	RxD+(B)	1	RxD+(B)
14	TxD+(B)	10	TxD+(B)	6	TxD+(B)	2	TxD+(B)
29	RxD-(A)	25	RxD-(A)	21	RxD-(A)	17	RxD-(A)
42	TxD-(A)	39	TxD-(A)	35	TxD-(A)	31	TxD-(A)
44	GND	41	GND	37	GND	33	GND

Industio CP-134U Series User’s Manual 5-3