Tips for reliable data transmission • Use shielded twisted-pair cable designed for RS devices standard microphone cable cannot transmit control data reliably overlong runs. 24 AWG cable is suitable for runs up to 300 meters (1000 ft. Heavier gauge cable and/or an amplifier is recommended for longer runs. Never use both a fixture’s outputs to split a DMX link. To split the link into branches, use a splitter such as the Martin Channel Opto-Isolated RS Splitter/Amplifier. • Terminate the link by installing a termination plugin the output socket of the last fixture. The termination plug, which is a male XLR plug with a 120 Ohm, 0.25 Watt resistor soldered between pins 2 and 3, soaks up the control signal so it does not reflect and cause interference. If a splitter is used, terminate each branch of the link.