Chauvet Obey 70 User Manual download pdf (Page 19)

Obey™ 70 User Manual 19 Revised: 2008-08-04 16:55:52

3BAPPENDIX

17BDMX Primer

There are 512 channels in a DMX-512 connection. Channels may be assigned in any manner. A

fixture capable of receiving DMX 512 will require one or a number of sequential channels. The

user must assign a starting address on the fixture that indicates the first channel reserved in the

controller. There are many different types of DMX controllable fixtures and they all may vary in

the total number of channels required. Choosing a start address should be planned in advance.

Channels should never overlap. If they do, this will result in erratic operation of the fixtures

whose starting address is set incorrectly. You can however, control multiple fixtures of the same

type using the same starting address as long as the intended result is that of unison movement

or operation. In other words, the fixtures will be slaved together and all respond exactly the

same.

DMX fixtures are designed to receive data through a serial Daisy Chain. A Daisy Chain

connection is where the DATA OUT of one fixture connects to the DATA IN of the next fixture.

The order in which the fixtures are connected is not important and has no effect on how a

controller communicates to each fixture. Use an order that provides for the easiest and most

direct cabling. Connect fixtures using shielded two conductor twisted pair cable with three pin

XLR male to female connectors. The shield connection is pin 1, while pin 2 is Data Negative (S-)

and pin 3 is Data positive (S+). CHAUVET carries 3-pin DMX compliant cables, DMX-10 (33’),

DMX-4.5 (15’) and DMX-1.5 (5’)

FIXTURE LINKING

Note! If you use a controller with a 5 pin DMX output connector, you will need to use a

5 pin to 3 pin adapter. Chauvet Model No: DMX5M.

The chart below details a proper cable conversion:

3 PIN TO 5 PIN CONVERSION CHART

ONDUCTOR

3 Pin Female (output) 5 Pin Male (Input)

GROUND

SHIELD

Pin 1 Pin 1

DATA ( - )SIGNAL

Pin 2 Pin 2

DATA ( + ) SIGNAL

Pin 3 Pin 3

DO NOT USE

Do not use

DO NOT USE

Do not use

COMMON

DMX +

DMX -

INPUT

OUTPUT

Resistance 120

ohm 1/4w between

pin 2 (DMX -) and

pin 3 (DMX +) of

the last fixture.

Termination reduces signal errors and to

avoid signal transmission problems and

interference, it is always advisable to connect

a DMX signal terminator.

Figure 1 - DMX connector configuration

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