Issue
When should end-of-line (EoL) terminating resistors be installed on a BACnet/MSTP network?
Product Line
TAC IA Series
Environment
BACnet/MSTP network
Cause
Knowing where to implement the termination helps reduce signal reflections, which might cause issues in the system.
Resolution
Resistors of 120 ohm value must be installed at each end of a MSTP (or RS-485) trunk segment. They help reduce signal reflections and RF interference. Failure to install end-of-line resistors may result in intermittent communications.
