Ocean Optics SeaChanger Installation And Operation Manual - page 14
2: Setup and Configuration
Determining a Valid DMX Base Address
The DMX base address (start channel) identifies each fixture on a link for the DMX controller. There are
512 available channels on each DMX link. These 512 channels are divided among all the devices on a
particular link. The number of channels a fixture requires is called the fixture’s channel range. The DMX
base address assigned to a particular fixture is the first channel available to a fixture in its channel range.
The fixture’s channel range must not overlap any other device’s channel range on the link. When two
devices on the same DMX link have overlapping channel ranges, one or both devices will be disabled or
behave erratically.
Remember the following criteria when determining a valid base address:
• The base address is the number of the first channel in a consecutive block of channels assigned to
an individual fixture.
• If you want two or more fixtures to respond to controller commands in exactly the same way, you
can assign them the same base address. In that case, those fixtures must be the same type and
must share the entire channel range.
• A fixture can be assigned the second block of DMX channels on a link without physically being
the second fixture on the link.
• To avoid overlapping channels, place the start channel at the beginning of a range of available
channels large enough to accommodate that fixture type.
• Every channel in the link does not need to be assigned.
• The channel range required for a fixture differs depending on the fixture type.
Setting the SeaChanger DMX Base Address
The SeaChanger Color Engine requires six DMX channels. Choose a DMX base address that precedes the
base address of any fixture the console controls.
►
Procedure
To set the SeaChanger Start channel:
1. Use the front panel buttons and LED numeric display to select the three digit base address. The
displayed address will become active after a three second delay.
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