High End Systems Technobeam Determining the Unique DMX Start Channel, 16Configuring the Fixture

link without a DMX splitter will eventually deteriorate the digital signal.

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.

Note	The single exception to the non-overlapping rule is if the
	fixtures are the same type (for example two
	Technobeams set to iris protocol) and share the entire
	channel range.

Determining the Unique DMX Start Channel

The DMX start channel is the first channel available to a fixture in its channel range. To determine each fixture’s DMX start channel in a link, you must know the number of DMX channels used by each fixture (see “Fixture Types” on page 2-13).

Knowing that the first fixture on the link will use DMX start channel 1, you can determine the DMX start channel for each successive fixture by adding the number of DMX channels used by the fixture to the fixture’s DMX start channel. For example, in Table 2-2, 18 (channels used by the Technobeam set to iris protocol) + 1 (DMX start channel for the first fixture) = 19 (DMX start channel for the next fixture on the link).

Table 2-2. Example: Determining the DMX Start Channel

Fixture			Number of DMX	DMX start	Channel
location on		Fixture name	channels used
				channel	range used
the link*			per fixture
First	Technobeam		18 channels	C001	1-18
	(iris protocol)
Second	Technobeam		18 channels	C019	19-36
	(full protocol)
Third	Technobeam		14 channels	C037	37-50
	(reduced protocol)
Fourth	Other Device		12 channels	C051	51-62
	(using 12 channels)
Fifth	Technobeam		18 channels	C063	63-80
	(iris protocol)
*Note		The fixture location on the link does not have to comply
		with this example. The fixtures can be addressed in any
		order on the link.

To assign a unique DMX start channel for the fixture:

1. Press and hold the <Menu> button until “ADDR” appears on the LED display.

2-16Configuring the Fixture Technobeam® User Manual