An R2 station is unable to communicate with any BACnet -MSTP controllers. Error in Standard Output Window: "ERROR: Cannot open BACnet MSTP Driver tridium.nre.DriverExceptio...

[Product_Support]

Issue

An R2 station is unable to communicate with any BACnet -MSTP controllers. Error in Standard Output Window:

"ERROR: Cannot open BACnet MSTP Driver

tridium.nre.DriverException: Cannot open Com5 [mstp]

      at tridium.nre.vxworks.mstp.VxWorksMstpDriver.doOpen (bytecode 46)

      at tridiumx.bacnet.services.link.mstp.MstpLinkService.start (bytecode 63)"

Environment

R2 station with BACnet/ MSTP trunk

Cause

The port specification is case-sensitive, and Com5  incorrectly includes lower-case characters.

Resolution

The MSTP port specification should be changed to COM5.