I do not have, nor am familiar with the Farbwerk, so I will let someone else address that item.
The two D5 Pumps can be configured and controlled from a USB only connection in aquasuite, including setting alarms.
pump.jpg
The two Fill Level Sensors can be configured and calibrated from a USB only connection in aquasuite. including setting alarms.
level.jpg
The primary reason for the aquabus connection is to allow devices to give input to, and be controlled by, the aquaero, normally not necessary for pumps and level sensors.