Issue
When should the MSTP bias resistors be enabled on a MNB-1000?
Product Line
TAC IA Series
Environment
BACnet /MSTP trunk under an MNB-1000
Cause
RS-485 biasing rules apply to BACnet / MSTP
Resolution
An MSTP network requires at least one set of bias resistors but no more than two sets. If a UNC device exists on the network it will provide one set of resistors. No others are needed. If one or more MNB-1000s are on the network, enable only one set of bias resistors.
