Jands DD-8, Руководство по эксплуатации

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JANDS DD-8 DMX SPLITTER
Revision 2.0 - 5 July 1998 OPERATING MANUAL - 7 -
4.0 Operating Notes
A DD-8 should be connected where its fault protection/isolation or fan out capability can
be most effective. See Figure 4.1 below. Suggested positions include:
1. Between pieces of equipment that run from different power sources. Examples
of different power sources include:
•
Stadium type shows where the dimmers are distributed in groups around the
stadium and each group is run from a local sub-board, transformer, or sub
station. In this case a separate DD-8 output should be used to drive separate
dimmer groups via individual cables. If this is not practical then a DD-8
should be placed at each dimmer group, to isolate that group.
•
Outdoor shows where the console is run from a different power supply to the
dimmers. In this case the DD-8 should be placed just before the input to the
first receiving device on the line.
2. At the input to a multi-piece equipment rack. If it is necessary to have complete
protection and isolation in a system then each receiving device must be
connected to an individual DD-8 output. If 12 channel dimmers in racks of six
are used, then one DD-8 per rack could isolate all of the dimmer inputs, provide
an isolated output for the next rack’s DD-8, and still have one spare output.
3. To drive a DMX-512 control signal in multiple directions from a centre hub
point. A DD-8 mounted in a truss can be used to provide drive signals for
moving lights in separate segments of the truss.
Fig. 4.1 Typical JANDS DD-8 system configuration
DMX-512 CONTROLLED DEVICES