Determining Dmx Start Channel Assignment - High End Systems TechnoArc User Manual

CHAPTER 3
Menu System

Determining DMX Start Channel Assignment

There are 512 available channels on each DMX link divided among all the devices in a particular
link. A fixture must have a unique Start channel number in order to respond independently to
controller commands.
To determine each fixture's DMX start channel in a link, identify the channel range of every fixture
on the link. Channel range is the number of consecutive channels a fixture requires. Each
TechnoArc fixture requires a block of 21 consecutive channels on a 512-Channel DMX link. The
Start channel is the first number of a fixture's channel range.
When setting the Start channel on a fixture, remember:
• A fixture's physical location on the link does not have to coincide with the order of channel
range assignments in the link.
• The fixture's channel range must not overlap any other device's channel range on the link.
When two devices on the same DMX link have overlapping channel ranges, one or both
devices will be disabled or behave erratically. The single exception would be if two or more
fixtures need to respond to controller commands in exactly the same way. In that case, those
fixtures must be the same type (for example two TechnoArc fixtures) and must share the
entire channel range.
The notes in the following table show the various considerations in determining valid Start
Channels for fixtures on a 512 DMX link. A single 512-Channel DMX link can accommodate up to
thirteen 21-channel TechnoArc fixtures.
Fixture
Fixture
Rig
Type
Position
First TechnoArc
Third TechnoArc
Second Technospot
Fourth Studio Spot
24
DMX DMX
Channel Start
Footprint Channel
21 channels C001
21 channels C022
37 channels C079
18 channels C121
Channel
Range
The Start channel is the first channel
1-21 in a consecutive block of channels
assigned to a fixture.
Fixture can be assigned the second
22-42 block of DMX channels without being
the second fixture on the rig.
Avoid overlapping channels with other
79-116
fixtures
Every channel in the link does not need
121-138
to be assigned.
Notes
TechnoArc User Manual
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