What is the signification of the history entry "Resisters Fail"?

FAQ #101722

 

Symptom
When trying to enable the termination resistors of port 3 of a PCD3.M5340 (produced beginning of 2012) the entry "RESISTERS FAIL" is entered in the PCD history.

Reason
If this error is shown in the PCD history, then it isn't possible to use the RS485/RS422 termination resistors for the port #3 of the PCD3.M5340 (RS485/RS422 port on the 9-pole D-Sub connector) due to a firmware restriction.

Solution
Please update the PCD firmware to version 1.16.60 or later. This firmware can e.g. be found in the lates BACnet firmware maintenance package.

Remark
The communication on the port #3 is possible without problems given the termination of the bus is realized externally.