User guide

Adjusting settings via DMX 15
Changing calibration offsets using DMX
The Fixture control/settings DMX channel allows effects to
be calibrated by changing their factory default offsets from
the DMX controller.
To set an effect offset:
1. Set the effect to a DMX value from 0 to 255 on its own
DMX channel (for example, set Cyan to 192 on channel
4).
2. Send a ‘Store’ command for the effect on the Fixture
Adjustment/Calibration channel.
The MAC Viper AirFX now reads the value on the effect
channel (192 for Cyan in the example above), translates it
to an offset value of between -5% and +5% as shown in
Figure 6 (+2.5% Cyan offset in the example above) and
stores that offset in memory.
See ”Fixture control/settings” in the DMX protocol on page
23 for details of the effect offsets that can be set using this
method.
Effect offsets stored in memory are not affected by
powering the fixture off and on or by updating the fixture
software. To return all offsets to their factory defaults, send
a DMX value from 245 to 249 for 5 seconds on the Fixture
control/settings channel or apply LOAD FACTORY
SETTINGS in the FACTORY SETTINGS menu in the
fixture’s control panel.
255
192
128
64
0
+5%
+2.5%
0
-2.5%
-5%
Effect channel
DMX value
Offset
value
Figure 6: Offset values