Sommer cable sc binary 434 dmx512 data cable sommer cable 540 0051 the sommer cable 540 0051 is a sc binary 434 dmx512 binary data cable that is ideal when data has to be passed back and forth the surge impedance for this cable is set at 110 ohm two of the 4 wires are responsible for the check back function the robust outer jacket is suitable for outdoor and permanent installation the cables are colour coded according to din 47100due to the double shielding alpt foil copper braiding