Basically, the u::Lux switch can be combined with an AddOn (AddOn RH+TEMP, AddOn MD+RH+TEMP, AddOn CO2+RH+TEMP, AddOn Multisensor). Each of these AddOns can be ADDITIONALLY expanded with ONE AddOn-IN2. This is simply plugged between the sensor add-on (e.g. MD+RH+TEMP) and the u::Lux Switch. The IN2 add-on has two sockets and is of course delivered with the required connection cable. Important: The IN2 inputs are only intended for potential-free contacts!

Summarised: 

• The u::Lux AddOn IN2 is a digital input module with 2 channels.
• Up to 2 digital signals (e.g. from a push-button or switch) can be connected to the u::Lux Switch.
• The states are sent to the control directly through the network. Additional inputs at the control are therefore not required.
• This AddOn is connected through an approx. 25cm long 4-pole cable (included in the scope of delivery) to the lower part of the u::Lux Switch.

Appropriate u::Lux Switch:
u::Lux Switch RJ45
u::Lux Switch LSA/IDC
u::Lux Switch KNX-TP

Further information:
u::Lux AddOns Manual

EXAMPLE 1:

Here you can see an application example of the combination u::Lux Switch + AddOn IN2 (e.g. with a 2-way switch).

EXAMPLE 2:

Here you can see an application example of the combination u::Lux Switch + AddOn Multisensor + AddOn IN2 (e.g. with a 2-way switch).