User manual

2-6 Configuring the Fixture Studio Spot
®
250 / Studio Color
®
250 User Manual
Wasted DMX Channels
If you mix different types of devices (which use different numbers of channel ranges)
on the same DMX link and assign fixture numbers (instead of DMX start channels) to
these devices, you would waste DMX channels.
For example, in Table 2-3, if you assigned fixture number 2 (F 02) to the Studio Color
250 fixture, it would assume that all other fixtures on the link are also using 15 DMX
channels, so it will erroneously try to receive channel 16 as the first channel in its
channel range. This would create channel overlapping because fixture number 1
(Studio Spot 250) is already using channel 16 in its 18-channel range.
In this example, to prevent overlapping channels, you must assign fixture number 3
(F 03) to the Studio Color 250, even though it is physically the second fixture on the
DMX link. While this would prevent overlapping channels, it would result in wasted
channels that could not be used (see
Table 2-3).
Therefore, if you choose to assign fixture numbers to different types of devices (and/or
protocols) on the same DMX link, refer to
“DMX Start Channels” on page A-1, which
shows the channel ranges reserved for Studio Spot 250 and Studio Color 250 fixtures.
This table will help you determine the next available DMX start channel/fixture
number for successive Studio Spot 250 or Studio Color 250 fixtures on the link.
Table 2-3. Example of Wasted DMX Channels
Fixture
location
on the link
Fixture name
Number of DMX
channels used
per fixture
Fixture number: DMX
channel range used (to
prevent overlapping)
Resulting
channels wasted
First Studio Spot 250 18 channels F 01 : 01-18
Second Studio Color 250 15 channels F 03 : 31-45
12 channels wasted
(19-30)
Third Studio Spot 250 18 channels F 05 : 55-72
9 channels wasted
(46-54)
Fourth Studio Spot 250 18 channels F 07 : 73-90