Set the ID of the 2nd UCM to No. 2 using the SW7 ID shunts Remove A and leave B, C, D inserted. Reset the UCM
In Comfigurator > Modules and Settings, set the number of UCMs to 2
To connect the UCMs to Comfort you can use the white 4 way cable. Connect the cable between JP6 ("RS485") on Comfort and JP2 or JP2A on the UCM.
The 2nd UCM can be connected via its own 4 way cable from JP2/JP2A on the 1st UCM to JP2 on the 2nd UCM
JP2 and JP2A are electrically the same points for convenience in connecting addtional UCMs
