I can tell you with 100% confidence that they do not require termination. ...
See this thread: http://www.controlbooth.com/forums/lighting/9116-dmx-termination-plug.html#post105377.Mac's don't need termination as most of them have their own! ...
I once had a similar issue (with VL1000s) and eventually found the problem to be a bad cable between fixtures 4 & 5, but #6 was the only one that acted up. I'm sure that's not what you wanted to hear.
See also this thread: http://www.controlbooth.com/forums/lighting/8929-wacky-dmx-issues.html.
Well got through the show tonight minus now 2 Mac500's doing the same thing . . . Weird part is truss has two optos on it one at each end of the truss and have two different data lines, one unit is at the end of the line on one side, and now same problem in the middle of the line on the other side. Anyone know of any bad software upgrades that may have made their way into these macs. Two new (from shop) units now have the same problem. They are two different home runs from dimmer beach. This is beyond me. . .
Do they do a recal on their own before/when the douser closes? Does a hard-reset make the fixture behave?... the show starts about 15 minutes in the dousers close and the go into a color roll and a soft reset will not stop it. ...
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