Appendix
DMX Control Mode
Operating in a DMX Control mode environment gives the user the greatest flexibility when it comes to
customizing or creating a show. In this mode you will be able to control each individual trait of the
fixture and each fixture independently. The LEDrain™38 uses 7 channels of control.
Note: Dipswitch 10 must be turned on to activate DMX control mode.
Note: Older 8-dipswitch version must have dipswitch 8 turned off to activate DMX control
mode. Dipswitches 1-7 set the DMX address, and the maximum address is 127.
S e t t i n g t h e D M X a d d r e s s
This DMX mode enables the use of a universal DMX controller device. Each fixture requires a "start
address" from 1 to 511. 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 occupies or uses 7 channels
of DMX and was addressed to start on DMX channel 100, would read data from channels: 100, 101,
102, 103, 104, 105 and 106. Choose start addresses so that the channels used do not overlap and
notate the start address selected for future reference.
If this is your first time addressing a fixture using the DMX-512 control protocol than I suggest jumping
to the Appendix Section and read 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. Determining which switches to toggle ON given a specific start address can be
accomplished in the following manner. By subtracting the largest switch value possible from the
selected start address until zero is achieved.
E
XAMPLE
S
TARTING
A
DDRESS
Address 10
Pin # 4
= 8
Pin # 2
= 2
Total
= 10
Address 24
Pin # 5
= 16
Pin # 4
= 8
Total =
24
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
You will most likely use the first
available number which maybe
number 1. This number was
selected for example purposes.
D
IP
S
WITCH
(DMX
V
ALUE
)
1
2
3
4
5
6
7
8
1
2
4
8
16
32
64
128
128
16
32
64
ON
1
2
4
8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
ON
128
16
32
64
1
2
4
8
LEDrain™38 User Manual
8
2007-11-28/10:08
