Issue
An R2 station is unable to communicate with any BACnet MSTP controllers. The Standard Output Window displays the following error:
ERROR: Cannot open BACnet MSTP Driver
tridium.nre.DriverException: Cannot open Com5 [mstp]Product Line
TAC IA SeriesEnvironment
R2 station with BACnet/ MSTP trunk
Cause
The MSTP port specification is case-sensitive. The configuration uses
Com5 (lowercase letters), which is incorrect.Resolution
Update the MSTP port specification to use uppercase letters:
COM5
This ensures the BACnet MSTP driver can open the correct port and establish communication.
