These gateways are connected to the Indoor Unit using the Indoor Unit's remote control bus (AB), which is the same bus used by the wired remote control of the Indoor Unit itself.
Multi-Unit
These gateways have direct access to the Outdoor Unit communication bus (TCC link) providing individual control points for the most relevant variables (on/off, setpoint, mode, fan speed, etc.) and signals from the Outdoor Units. These gateways use ETS as Configuration Tool.
When checking a compatibility consider: