Can I use a free NYM cable or control line for the dS 485 bus? digitalSTROM Support September 21, 2018 14:08 Updated Follow The dS485 bus requires two twisted wires for stable communication. A diameter of 0.6 - 0.8 mm is recommended. Related articles How should an apartment be prepared so that a digitalSTROM installation is possible at a later date easily? How are the dSMs and the dSS connected? Which devices can be linked and controlled with digitalSTROM?