iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 11 of 41
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proper wiring;
consideration of cable types and their cross sections;
and other.
4.4.2 Network Termination
Transmission line effects often present problems for data communication networks.
These problems include reflections and signal attenuation.
To eliminate the presence of reflections of signal from the end of the cable, the cable
must be terminated at both ends with a resistor across the line adequate to its
characteristic impedance. Both ends must be terminated since the propagation is
bidirectional. In case of an RS485 twisted pair cable this termination is typically 120
Ω.
