Select Products II - Manual (Page 17)

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Fan speed (when enabled at the power supply) is remotely controlled with the
following DMX levels:
51% to 100% -- fan at normal (high) speed
0% to 50% -- fan at low speed
8% = fan off (when this function is enabled at the power supply)
Refer to the user manual of the various Coloram II products for detailed operating
information on those products.
The formula for calculating DMX channels is as follows:
Color Changer DMX channel = Color Changer channel + Power
Supply starting channel - 1
Example: Color changer DMX channel (221) = color changer channel (20) +
power supply starting channel (202) -1
Note: For the 24-way power supply, the Coloram II color changers can only be
addressed to the first 24 channels of the 48 channel block of the power supply.
Note: The color changers will not respond to the DMX signal until you return
in the "menu tree" to the RUN SCREEN loop.
5. Connect and set the DMX512 source
Connect the DMX512 signal source to the DMX input connector on the front of the
power supply using standard DMX cable. Valid DMX signal will be indicated by the
words "DMX OK" on the power supply display. The color changers will now position
their gelstrings according to their respective DMX signal levels.
Head-Feet Restrictions
The HEAD-FEET parameter is a method of accounting for the voltage drop in the
power/signal cable caused by the current drawn by each color changer.
To help understand this issue, think of it as water pressure (voltage) in a hose (cable)
where you have multiple water sprinkler heads (color changers). If the hose (cable) is
too long or you have too many sprinkler heads (color changers), the water pressure
(voltage) will be too low.
HEAD-FEET is defined as "the sum of cable lengths from each color changer to a single
power supply output".