@felmue oh, nice and inexpensive problem solver product. i will use it. For now i have a extra Power Supply for the S3 Device with 12V2A output and set the external Power in UIFlow to Output Mode, but in the Product Page i read on the End it is for Port A and MBus. The MBus is for the Stacked Devices ? But currently there are not many Stackable Modules out that can be used with UIFlow on the S3. And i think Core 2 Modules will not work with the S3 Device when they can´t be added in UIFlow ?