User manual
4-8 Chapter 4: Appendix D: RS-422/485 Wiring Diagram
Echo User's Manual, ver. 0.00
Appendix D: RS-422/485 Options
RS-422/485 Cable Wiring
You can wire Echo adapters with the RS-422/485 option in
various ways to communicate with RS-422/485 peripherals. This
section will descibe a few examples of RS-422/485 cabling
schemes.
Figure 19 describes a 4 wire cabling scheme between a port on
the Echo adapter to a port on the RS-422/485 peripheral.
Figure 19: 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
Echo adapter RS-485 peripheral
2
3
4
5
6
7
8
9
1
Technical Tip
The RS-422/485 electrical interface consists of a differential
signaling scheme. You should always connect the signals with
twisted pairs.