Martin Professional Inground 200, Installation Manual

Page: 14 / 20

14 Power and data connection
• The maximum permitted control data cable length is 500 meters (1640 ft). If more than 500 meters
of control data cable will be necessary, contact your Martin Architectural dealer for advice.
• Avoid long parallel runs of AC power and control data cables. Even if not required by law, separate
conduits are recommended for power and data cables.
• The last fixture in the chain must be terminated with a 120 Ohm resistor connected in parallel with
the fixture between the + (brown wire) and - (black wire) DMX terminals. Note that this only applies
to the last fixture in the chain. No resistor should be used on the other fixtures.
Connecting control data cables
Inground 200 6 Color and Full Spectrum CMY models are supplied with 2 stainless steel M16 x
1.5mm cable glands water resistant to IP68 for data cable entry. The glands accept from 5 to 9mm
diameter cable.
To connect data cable:
1. If the internal components are not already removed to give access to the cable connection
compartment, remove them (see “Component removal & reinstallation” on page 17).
2. If the connection compartment cover has not already been removed, remove it for access (see
“Connecting power supply cables” on page 11)
3. Working from outside the fixture, unscrew a smaller blanking plug. Dismantle a data cable gland
and screw the cable entry into the hole in the bottom of the fixture housing with its rubber O-ring
facing inwards, so that the O-ring makes a seal against the housing. Tighten sufficiently to make
a water-resistant seal. Do not over-tighten, as this may damage the seal.
4. Thread data cable through the compression nut, washer, rubber gland and cable entry into the
fixture. Remember to allow at least 80 cm (2 ft 8 in) of cable slack in the installation well or
sleeve, so that the Inground 200 can be lifted clear for cable disconnection or service.
5. Prevent the cable entry from turning by holding it with a wrench. Tighten the compression nut
sufficiently to make a water-resistant seal. Do not over-tighten, as this may damage the seal.
6. If the data link is to be continued to another fixture, repeat steps 3 to 5 for the data out cable.
7. Working inside the fixture, connect the incoming DMX data cable to the Inground 200 data cable
tail. Connect DMX + to the Inground 200´s brown DMX wire, connect DMX - to the Inground
200´s black wire, and connect shield to shield
. If the data link is to be continued to another fixture,
Black to DMX - and 120 Ohm resistor
Brown to DMX + and 120 Ohm resistor