Connect Tech Titan/cPCI - Manual (Page 33)

Titan/cPCI User’s Manual, Connect Tech Inc.
Revision 1.01 29
RS-422/485 Cable Wiring
You can wire Titan/cPCI adapters in various ways to communicate with RS-422/485
peripherals. This section describes a few examples of RS-422/485 cabling schemes.
Figure 8 depicts a 4 wire cabling scheme between a port on the Titan/cPCI adapter to a port on
the RS-422/485 peripheral.
Figure 9: RS-422/485 wiring diagram (4 wire)
RTS +
RTS -
CTS +
CTS -
TxD +
TxD -
RxD +
RxD -
RxD + TxD +
RxD - TxD -
RTS -
CTS -
RTS +
CTS +
SR SR
Titan/cPCI adapter RS-485 peripheral
3
4
2
5
6
9
7
8
1
Technical Tip
The RS-422/485 electrical interface consists of a differential signaling
scheme. You should always connect the signals with twisted
pairs