Rs-422, Rs-485 and rs-422 tip, Setting jumpers – ProSoft Technology MVI46-103M User Manual

Page 77: Setting, Jumpers, Mvi46-103m, Status data area

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Reference MVI46-103M

♦ SLC Platform

IEC 60870-5-103 Master Communication Module

ProSoft Technology, Inc.

Page 77 of 187

September 12, 2006

7.1.4 RS-422

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.

7.2 Setting

Jumpers

If you use an interface other than RS-232 (default), you must change the jumper
configuration to match the interface. The following illustration shows the MVI46-
103M jumper configuration: