Prosoft-technology MVI69E-MBS Manuale Utente Scaricare il pdf (Pagina 155)

MVI69E-MBS ♦ CompactLogix Platform Reference

Communication Module User Manual

ProSoft Technology, Inc. Page 155 of 162

January 6, 2014

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

these cases, installing a 120-ohm terminating resistor between pins 1 and 8 on the module

connector end of the RS-485 line may improve communication quality.

RS-485 and RS-422 Tip

If communication in the RS-422 or RS-485 mode does not work at first, despite

all attempts, try switching termination polarities. Some manufacturers interpret +

and -, or A and B, polarities differently.

7.6.4 DB9 to RJ45 Adaptor (Cable 14)

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Prosoft-technology MVI69E-MBS Manuale Utente Pagina 155