Martin MAC 401 Dual, Руководство пользователя

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Data link 11
Data link
A data link is required in order to control a MAC 401 Dual™ via DMX.
The MAC 401 Dual™ has 5-pin locking XLR connectors for DMX data input and output. The pin-out on XLR
connectors is pin 1 = shield, pin 2 = cold (-), and pin 3 = hot (+).
Pins 4 and 5 in the 5-pin XLR connectors are not used in the MAC 401 Dual™ but they are connected in to
the output connector to allow any data that may be present on pins 4 and 5 to pass through the fixture.
Sockets are wired in parallel: both inputs connect to both outputs.
Two RJ-45 connectors are also provided, making the MAC 401 Dual™ ready for future data communication
options over an Ethernet link. If you wish to use these options when available, ensure that the latest
available firmware is installed in the fixture.
Tips for reliable DMX 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 is recommended for longer runs.
• To split the link into branches, use a splitter such as the Martin™ RS-485 Opto-Splitter™ 4-channel
optically isolated splitter/amplifier.
• Do not overload the link. Up to 32 devices may be connected on a serial link.
• 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 a splitter is used, terminate each
branch of the link.
Connecting the DMX data link
1. Connect the DMX data output from the controller to the MAC 401 Dual™’s 5-pin male XLR input socket.
2. Continue connecting fixtures, DMX output to DMX input, in one single chain.
3. Use a splitter-amplifier such as the Martin RS-485 Optosplitter (P/N 90758060) if you need to branch the
link into two chains.
4. Insert a DMX termination plug in the DMX output of the last fixture on each chain.