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Data Connection

section 4

DATA CONNECTION

This section describes how to connect fixtures to a controller. The MAC 300’s 3-pin XLR connectors are configured

for use with DMX-512 controllers. To reconfigure them for use with Martin Protocol controllers, see “Changing the

XLR pin-out” on page 19.

XLR PIN-OUT

Pin 1: shield Pin 2: signal - Pin 3: signal +

Recommended cable

Use cable designed for RS-485 devices with low capacitance and a characteristic impedance of 85 to 150 ohms. The

cable must be electrically shielded and have at least 1 pair of twisted wires. The minimum wire size is 0.2 mm

(24

AWG) for runs up to 300 meters (1000 ft.), and 0.322 mm

(26 AWG) for runs up 500 meters (1640 ft.).

Adaptors

As many devices have 5-pin connectors and others have 3-pin connectors with reversed signal polarity, adaptor cables

as shown below may be required. Insert a termination plug in the output of the last fixture on the link.

Building the data link

1. DMX controllers:

Connect a data cable to the controller’s data output. If controller has a 5-pin female

socket, use a 5-pin male to 3-pin female adaptor cable (P/N 11820005).

Martin RS-485 protocol controllers

: First, connect a 3-pin “swapper” cable (P/N 11820006) to the

controller’s data output; then, connect a regular data cable to the swapper cable. Alternatively, reconfig-

ure the XLR pin-out as described on page 19.

If convenient, you may split the link into branches using a splitter such as the Martin 4-Channel

Opto-Isolated RS-485 Splitter/Amplifier. Do not use a “Y” connector to split the link.

Lead the data cable from the controller to the first fixture. Plug the cable into the fixture’s data

input socket.

Connect the output of the fixture closest to the controller to the input of the next fixture. If con-

necting to another type of fixture with reversed-polarity (pin 3 cold), insert a swapper cable

between the two fixtures.

Continue connecting fixtures output to input. Up to 32 devices may be connected on a serial link.

If more fixtures are required, use another controller output, if available, or an RS-485 amplifier.

Terminate the link

by inserting a male termination plug (P/N 91613017) into the data output of

the last fixture. A termination plug is simply an XLR connector with a 120 ohm, 0.25 W resistor

soldered across pins 2 and 3. If a splitter is used, each branch of the link must be terminated.

Phase-Reversing

Adaptor

Male Female

3-pin to 3-pin

P/N 11820006

Adaptor

Male Female

5-pin to 3-pin

P/N 11820005

Adaptor

Male Female

3-pin to 5-pin

Construct

Figure 2: Cable adaptors and termination

Male

Termination Plug

P/N 91613017

120

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

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Martin MAC 300 Manual de usuario Pagina 7

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