Moxa Technologies C168P Manuel d'utilisateur télécharger pdf (Page 77)

Connection Cables and Cable Wiring

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.

Industio CP-134U Series User’s Manual

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Moxa Technologies C168P Manuel d'utilisateur Page 77