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CHAPTER 3
Menu System
22 Technospot TM User Manual
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
Technospot fixture requires a block of 37 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 Technospot 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 39-channel Technospot fixtures.
Fixture
rig
position
Fixture
type
DMX
channels
footprint
DMX
Start
channel
Channel
Range
Notes
First Technospot 37 channels C001 1-37
The Start channel is the first channel in a
consecutive block of channels assigned
to a fixture.
Third Technospot 37 channels C040 40-77
Fixture can be assigned the second
block of DMX channels without being the
second fixture on the rig.
Second Technospot 37 channels C079 79-116
Avoid overlapping channels with other
fixtures
Fourth Studio Spot 18 channels C121 121-138
Every channel in the link does not need
to be assigned.
CHAPTER 3
Menu System
22 Technospot TM User Manual
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
Technospot fixture requires a block of 37 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 Technospot 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 39-channel Technospot fixtures.
Fixture
rig
position
Fixture
type
DMX
channels
footprint
DMX
Start
channel
Channel
Range
Notes
First Technospot 37 channels C001 1-37
The Start channel is the first channel in a
consecutive block of channels assigned
to a fixture.
Third Technospot 37 channels C040 40-77
Fixture can be assigned the second
block of DMX channels without being the
second fixture on the rig.
Second Technospot 37 channels C079 79-116
Avoid overlapping channels with other
fixtures
Fourth Studio Spot 18 channels C121 121-138
Every channel in the link does not need
to be assigned.