Prosoft-technology MVI56-DFCMR Bedienungsanleitung PDF herunterladen (Seite 84)

MVI56-DFCMR ♦ ControlLogix Platform Reference

DF1 Interface Module with Reduced Data Block

Page 84 of 113 ProSoft Technology, Inc.

October 20, 2008

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.

5.3.5 DB9 to RJ45 Adaptor (Cable 14)

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Prosoft-technology MVI56-DFCMR Bedienungsanleitung Seite 84