Connecting The Dmx Data Link - Martin MAC 250 Wash User Manual

5. Install a safety cable that can bear at least 10 times the weight of the fixture securely to the structure and
anchor the cable to the dedicated attachment point on the base. The attachment point is designed to fit
a carabiner clamp.
6. Check that there are no combustible materials or surfaces to be illuminated within 0.1 meter (4 inches)
of the fixture, and that there are no flammable materials nearby.
7. Check that there is no possibility of heads or yokes colliding with other fixtures.

Connecting the DMX data link

The MAC 250 Wash has locking 3-pin and 5-pin XLR data input and output sockets that are wired for use
with standard DMX devices with pin 1 to shield, pin 2 to cold (-) and pin 3 to hot (+).
Important! Never connect more than 1 data input and 1 data output to the fixture.
1. Connect the controller's output to the fixture's data input.
2. Connect the output of the fixture closest to the
controller to the input of the next fixture. If
connecting a fixture with pin 3 hot to a fixture with
reversed polarity (pin 3 cold), use a phase-reversing
adaptor.
3. To terminate the link, insert a male 120 ohm XLR
termination plug in the output of the last fixture.
T I P S F O R B U I L D I N G A D M X L I N K
• Use shielded twisted-pair cable designed for RS-485
devices: standard microphone cable cannot transmit
DMX data reliably over long runs. For links up to 300
meters (1000 ft.) long, you can use 24 AWG, low capacitance, 85-150 ohm characteristic impedance,
shielded cable with 1 or more twisted pairs. For runs up to 500 meters (1640 ft.), use 22 AWG cable. Use
an amplifier if the DMX link exceeds 500 meters.
• Fixtures must be connected in a single line. Never use a "Y" connector to split the link. To split the DMX
link into branches, use a splitter such as the Martin 4-Channel Opto-Isolated RS-485 Splitter/Amplifier.
• Do not overload the link. Up to 32 devices may be connected on a DMX link.
• Terminate the link by installing a termination plug in the output socket of the last fixture on the link. The
termination plug is a male XLR connector with a 120 ohm, 0.25 watt resistor soldered between pins 2 and
3. This "soaks up" the control signal so it does not reflect back down the link and cause interference. If a
splitter is used, terminate each branch of the link.
Figure 4: Safety cable attachment point
Setup
3-pin to 3-pin
phase-reversing
termination plug
adaptor
Male Female
1 1
2 2
3 3
P/N 11820006 P/N 91613017
Male
Male XLR
1
2
Ω
120
3
11