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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)
1RxD+(B)
14 TxD+(B) 10 TxD+(B) 6 TxD+(B)
2TxD+(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
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