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 Is the dS485 bus a SELV or PELV circuit? What is the maximum cable length for a dS485 bus? Can I use DALI luminaires within a digitalSTROM system? Does digitalSTROM offer a driver with 10V input?