Cannot learn in B3 controllers.


Trying to add B3 controllers to BCX and they are not coming online.

Product Line

Andover Continuum


  • BCX 4040
  • Continuum 1.9X
  • B3XXX  controllers


BacNet wiring can not be in a star configuration. There can not be more than two terminating 120 Ohm resistors.


  1. The Bus must be wired in series with end line 120 Ohm resistors.
  2. Install a B-Link if the bus path cannot be wired in series.

Please see the BacNet Technical Reference manual for wiring examples.