How can I process low voltage signals? digitalSTROM Support September 25, 2018 07:02 Updated Follow The SW-UMR200 has 2 potential-free inputs (7.5-230V DC / AC) and 2 potential-free relay outputs (changeover contacts) to integrate devices such as alarm systems, door locks, door bells, pumps etc. Related articles How to control a garage door via digitalSTROM Is the dS485 bus a SELV or PELV circuit? Where are the dSF filters to be installed? How can motion detectors be integrated?