Moxa-technologies CP-132U Manuel d'utilisateur télécharger pdf (Page 79)

Connection Cables and Cables Wiring

CP-132U Series User’s Manual

5-7

Impedance Matching and Termination Resistors

When using RS-422/485 serial communications, an electrical signal that travels through

two different resistance junctions in a transmission line will sometimes give rise to signal

reflection due to the impedance mismatch. Signal reflection causes signal distortion, which

in turn contributes to communication errors. The solution to this problem is to establish the

same impedance at the ends of the transmission line, as in the line itself, by terminating the

ends of the line with resistors.

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Moxa-technologies CP-132U Manuel d'utilisateur Page 79