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Chapter 4: Appendices – RS-485/422 Interface
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)
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 adapter
TxD +
3
TxD -
4
RxD +
1
RxD -
2
RTS +
7
CTS +
8
RTS -
9
CTS -
6
SR
5
RS-485 peripheral
RxD +
RxD -
TxD +
TxD -
CTS +
RTS +
CTS -
RTS -
SR
Titan/cPCI User's Manual, ver. 0.00
4-13
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