ProSoft Technology MVI71-DNP - Manual (Page 116)

MVI71-DNP ♦ PLC Platform Reference
DNP 3.0 Master/Slave Communication Module
Page 116 of 172 ProSoft Technology, Inc.
August 23, 2007
5.4.4 RS-485
The RS-485 interface requires a single two or three wire cable. The Common
connection is optional and dependent on the RS-485 network. The cable required
for this interface is shown below:
RS-485 and RS-422 Tip
If communication in the RS-422/RS-485 mode does not work at first, despite all
attempts, try switching termination polarities. Some manufacturers interpret +/-
and A/B polarities differently.
5.4.5 DB9 to RJ45 Adaptor (Cable 14)