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SETTING THE STARTING ADDRESS
This DMX mode enables the use of a universal DMX controller device. Each fixture requires a "start
address" from 1 to 512. A fixture requiring one or more channels for control begins to read the data
on the channel indicated by the start address. For example, a fixture that uses 6 DMX channels
and was addressed to start on DMX channel 100, would read data from channels: 100, 101, 102,
103, 104, and 105. Choose start addresses so that the channels used do not overlap, and note the
start address selected for future reference.
If this is your first time addressing a fixture using the DMX-512 control protocol, we suggest
jumping to the Appendix Section and reading the heading “DMX Primer”. It contains very useful
information that will help you understand its use.
Set the start address using the group of DIP switches located usually on bottom of the fixture. Each
dip switch has an associated value. Adding the value of each switch in the ON position will provide
the start address. Figuring out which switches to toggle ON given a specific start address can be
accomplished by determining which switch values will add up to the address value and turning
these switches on. Do so by doing the following:
1) Determine the largest value switch that is less than the start address. Turn this switch on.
2) Subtract the value of the switch you just turned on from the starting address number.
3) Determine the largest value switch that is less than the remainder from the previous
subtraction. Turn this switch on.
4) Subtract the value of the switch you just turned on from the remainder of the previous
subtraction.
5) Repeat steps three and four until you have a remainder of zero.
Example Starting Address
Address 10
Switch # 4 = 8
Switch # 2 = 2
Total = 10
13456789
ON
OFF
1
2
4
8
16
32
64
128
256
13456789
ON
OFF
1
2
4
8
16
32
64
128
256
13456789
ON
OFF
1
2
4
8
16
32
64
128
256
13456789
ON
OFF
1
2
4
8
16
32
64
128
256
13456789
ON
OFF
1
2
4
8
16
32
64
128
256
12222223456789
ON
OFF
1
2
4
8
16
32
64
128
256
Address 24
Switch # 5 = 16
Switch # 4 = 8
Total = 24
123456789
ON
OFF
1
2
4
8
16
32
64
128
256
123456789
ON
OFF
1
2
4
8
16
32
64
128
256
123456789
ON
OFF
1
2
4
8
16
32
64
128
256
123456789
ON
OFF
1
2
4
8
16
32
64
128
256
123456789
ON
OFF
1
2
4
8
16
32
64
128
256
123456789
ON
OFF
1
2
4
8
16
32
64
128
256
Resolving address
using simple math.
Address 233
233 – (128) = 105, Turn ON Dip # 8
105 – (64) = 41, Turn ON Dip # 7
41 – (32) = 9, Turn ON Dip # 6
9 – (8) = 1, Turn ON Dip # 4
1 – (1) = 0, Turn ON Dip # 1
DIPSWITCH
(DMXVALUE)
1
2
3
4
5
6
7
8
9
1
2
4
8
16
32
64
128
256
Derby X™ User Manual 12 7/14/2008 1:27 PM