Prosoft-technology MVI46-DFCM Instrukcja Użytkownika Pobierz pdf (Strona 76)

MVI46-DFCM ♦ SLC Platform Reference

DF1 Communication Module

Page 76 of 103 ProSoft Technology, Inc.

October 20, 2008

5.3.3 RS-422

5.3.4 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:

Note: Terminating resistors are generally not required on the RS-485 network, unless you are

experiencing communication problems that can be attributed to signal echoes or reflections. In this

case, install a 120 ohm terminating resistor on the RS-485 line.

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.

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Prosoft-technology MVI46-DFCM Instrukcja Użytkownika Strona 76