What is the maximum cable length for a dS485 bus? digitalSTROM Support September 26, 2018 07:06 Updated Follow The maximum cable lenght for a dS485 bus is 100 m. Related articles How are the dSMs and the dSS connected? Is the dS485 bus a SELV or PELV circuit? Which cable do you recommend according to VDE 0100-444 for the dS485 bus? Can I use a free NYM cable or control line for the dS 485 bus? Can other deviced be linked to the dS-485 bus?