Martin DMX Controller 2518 User Manual download pdf (Page 7)

BUILD

THE

SERIAL

LINK

1. Use shielded twisted-pair cable.

A reliable data connection begins

with the right cable. Microphone cable cannot transmit DMX data reliably

over long runs. For best results, use only cable designed for RS-485

applications. Your Martin dealer has a range of cables, connectors, and

adaptors designed for lighting control.

2. Starting from the controller, connect output to input.

Check the

pin-out on Martin fixtures and be sure to connect hot to hot and cold

to cold.

3. Never use a “Y” connector to split the link.

If you need to split

the serial link into branches use a dedicated splitter/amplifier such

as the Martin 4-Channel Opto-Isolated RS-485 Splitter.

4. Don’t overload the link.

Placing more than 32 devices on a link

can cause unpredictable performance. The control units for the

RoboColor IIx and RoboColor III systems, the Martin DMX Switch

Pack, and the Martin DMX Interface each count as 1 device.

5. Always terminate the link

by installing the provided termination

plug in the output socket of the last fixture on the link. The termina-

tion plug, which is a male XLR connector with a 120 ohm resistor

soldered between pins 2 and 3, “soaks up” the control signal so it

cannot reflect back down the link. If a splitter is used, terminate

each branch of the link.

ONNECTING

THE

POWER

SUPPLY

For safe operation, the controller must be

grounded (earthed).

INSTALL

PLUG

The 2518 DMX Controller is delivered without a plug on the power cord. Following

the manufacturer’s instructions, install an approved 3-prong grounding-type plug that

fits your supply. Connect the wires to the pins as listed below. If the pins are not

clearly identified, or if you have any doubts about proper installation, consult a qual-

ified electrician.

Wire Pin Marking Screw color

brown live “L” yellow or brass

blue neutral “N” silver

yellow/green ground green

Table 3: Plug Wiring

1 2 3 4 5 6 7 8 9 10 11 12 ... 27 28

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Martin DMX Controller 2518 User Manual Page 7

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