KNX 48CH Dry Contact Module is a KNX standard protocol module with 48 dry contact channels, which enables control of lights, curtains, scenes, etc. Can be used as binary inputs and binary outputs. Binary input: used to switching, dimming and curtain control, Binary output: used to drive signal LEDs with on/off control or percentage control, Logic function: AND, OR, NAND, NOR, XOR, Auxiliarycurrent:10mA/30V DC.