User manual

Chapter 4: Appendix D - RS-422/485 Options 4-9
Echo User's Manual, ver. 0.00
Figure 20 describes a 2 wire cabling scheme between a port on
the Echo adapter to a port on the RS-422/485 peripheral.
Figure 20: RS-422/485 wiring diagram (2 wire)
RTS +
RTS -
CTS +
CTS -
TxD +
TxD -
RxD +
RxD -
RxD +
TxD +
RxD -
TxD -
RTS -
CTS -
RTS +
CTS +
SR
SR
Echo adapter
RS-485 peripheral
2
1
3
4
5
6
7
8
9
Technical Tip
The RS-422/485 electrical interface consists of a differential
signaling scheme. You should always connect the signals with
twisted pairs.