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Control data link
A DMX 512 data link is required in order to control the fixture via DMX or to use the master/slave functionality. The fixture has 5-pin XLR connectors for DMX data input and output.
The number of daisy-chained fixtures is limited by the number of DMX channels required by the fixtures in relation to the maximum 512 channels available in one
DMX universe. Note that if independent control of a fixture is required, it must have its own DMX channels. Fixtures that are required to behave identically can share the same DMX address and channels. To add more fixtures or groups of fixtures when the above limit is reached, add a DMX universe and another daisychained link.
Tips for reliable data transmission
Use shielded twisted-pair cable designed for RS-485 devices: standard microphone cable cannot transmit control data reliably over long runs. 24 AWG cable is suitable for runs up to 300 meters (1000 ft.). Heavier gauge cable and/or an amplifier are recommended for longer runs. The pin-out on all connectors is:
• pin 1 = shield
• pin 2 = cold (-)
• pin 3 = hot (+)
Pins 4 and 5 in the XLR connectors are not used in the fixture but are available for possible additional data signals as required by the DMX512-A standard.
Standard pin-out is:
• pin 4 = data 2 cold (-)
• pin 5 = data 2 hot (+).
To split the link into branches, use a splitter, such as the Martin 4-Channel Opto-
Isolated RS-485 Splitter/Amplifier. Terminate the link by installing a termination plug in 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 you use a DMX splitter, terminate each branch of the link.
RUSH PAR 1 RGBW User Manual
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