Connect Tech JB1, JB0 RS-485/422 Cable Wiring, RS-485/422 wiring diagram 4 wire, Technical Tip

Chapter 4: Appendices – RS-485/422 Interface 4-13

RS-485/422 Cable Wiring

You can wire Titan/cPCI adapters in various ways to communicate with RS-485/422 peripherals. This section describes a few examples of RS-485/422 cabling schemes.

Figure 5 describes a 4 wire cabling scheme between a port on the Titan/cPCI adapter to a port on the RS-485/422 peripheral.

Figure 5: RS-485/422 wiring diagram (4 wire)

Titan/cPCI adapter		RS-485 peripheral
3	TxD +	RxD +
4	TxD -	RxD -
1	RxD +	TxD +
2	RxD -	TxD -
7	RTS +	CTS +
8	CTS +	RTS +
9	RTS -	CTS -
6	CTS -	RTS -
5	SR	SR

Technical Tip

The RS-485/422 electrical interface consists of a differential signaling scheme. You should always connect the signals with twisted pairs

Titan/cPCI User’s Manual, ver. 0.00