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? Which cable do you recommend according to VDE 0100-444 for the dS485 bus? How accurate is the power measurement of the dSM? Is the dS485 bus a SELV or PELV circuit? What is the maximum cable length?