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Control data link
A DMX512 data link is required in order to control the fixture via DMX (and manage fixtures via RDM, if
used). Your Martin® supplier will be happy to help if you need advice or assistance in planning the link.
Follow these guidelines when creating a DMX data link:
●
512 DMX channels are available in one DMX universe. If the total combined channel requirements of
all connected fixtures exceeds 512, one or more additional DMX universes will be required.
●
Use RS-485 data cable designed for exterior use for the data link. RS-485 cable has low capacitance
and a characteristic impedance of 85 to 150 Ohms. It is electrically shielded and has at least 1 twisted
pair of conductors. The minimum recommended wire size is 0.25 mm2 (24 AWG) for runs up to 100
meters (1000 ft.) and 0.32 mm2 (22 AWG) for runs up 500 meters (1640 ft).
●
Connect fixtures in one single daisy chain (i.e. one line without branches) up to a maximum of 32
fixtures.
●
If you want to create branches in the DMX data link, you must use an opto-isolated splitter-amplifier.
To preserve RDM functionality, use an RDM-compatible splitter-amplifier such as the Martin® 5.5
RDM Splitter™. Each new branch may contain up to 32 fixtures.
●
You can also use an RDM-compatible splitter-amplifier to extend a network beyond 500 meters
(1640 ft.) or to connect up to 32 additional fixtures to the daisy chain.
●
Terminate the end of the data link and the end of each branch by placing a 120 ohm resistor
(available from Martin®, P/N 04150308) across the data output hot (+ve) and data output cold (-ve)
conductors of the last fixture in the chain.
●
Avoid creating long parallel runs of AC power and control data cables because these may cause
interference on the data link. Even if not required by law, use separate conduits for power and data
cables.
●
The combined DMX data input/output cable tail supplied with Exterior Wash fixtures does not support
the second pair of data conductors on the DMX link that is provided for by the DMX 512-A standard. If
any devices in the installation use the second data pair, you cannot include them on the same DMX
data link as Exterior Wash fixtures. Such devices will require a separate DMX data link that has
conductors for the second data pair.
Connecting the data link
Important! Protect all connections and all breaks in cable jackets from moisture (see 'Protecting
connections from moisture' on page 15).
The fixture has a 1.8 m (5.9 ft.) shielded cable with 2 pairs of wire for data connection. The pair of wires
marked with a short length of red insulation is for data input. The other pair, marked with a short length of
black insulation, is for output to the next device in the daisy chain.
You can connect the data cable using screw terminals or soldered joints in junction boxes or using XLR
connectors that are suitable for the environment. Ensure that the fixture is protected from the entry of
water via the data cable by using junction boxes or connectors that are protected to IP67 or higher. Fill
junction boxes with potting compound.
DMX cable details
TM
Exterior Wash
100 Series User Manual
17
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