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 Which cable do you recommend according to VDE 0100-444 for the dS485 bus? Can I use FI/LS leakage protectors in combinatin with a circuit-breaker in digitalSTROM installations? How are the dSMs and the dSS connected? The LED of the terminal block blinks 4 times, followed by a longer pause Is it also possible to use 3-phase (400V) external conductors?