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CHAPTER 4 
DMX Programming Basics and Quick Start
38
DL.2 Digital Light User Manual
Determining a DMX Start Channel
The DMX Start Channel is the first channel of a device’s channel range on a DMX link. There are 
512 available channels on each DMX universe divided among all the devices in a particular 
universe. A device must have a unique DMX Start Channel number in order to respond 
independently to controller commands. 
To determine each device’s DMX Start Channel, identify the footprint of every device on the 
universe. The device’s footprint is the number of consecutive DMX channels a device requires 
and is determined by the channels in the fixture’s protocol. The fixture’s DMX channel range 
must not overlap any other device’s channel range on the link. When two devices on the same 
DMX universe have overlapping channel ranges, one or both devices will be disabled or behave 
erratically. 
Axon media servers and DL.2 fixtures both 
provide individual and composite graphical control 
for up to three 3-D Objects. You can control the 
“footprint” of the fixture on a DMX link by 
choosing to implement only the number of 3-D 
objects your application requires. Select the 
protocol level in the fixture’s onboard menu 
system for DL.2 fixtures or through the
Protocol 
Selection
DMX Channel Range
Axon
DL.2
Standard Protocol
149
170
Dual Protocol
111
132
Single Protocol
73
94
 CMA for 
either DL.2 fixtures or Axon media servers (see Viewing Fixture Configuration Values on page 
205).
The tables that follow list the parameters included in each level of protocol for both the DL.2 
fixture and the Axon media server.