LED Lights Flashing?

0000000000000000000000

 

I would double check the Terminator and check and see if they still flash when they are not plugged into the board. The light board could be sending out bad information on the DMX line.

 

XLM only refers to the actual connector on the end of the cable. Both DMX and Microphones use XLR Connectors. Cables used for DMX should be of a higher quality cable, usually a twisted pair, shielded cable to prevent interference and cancel out any that does occur. Microphone cable should also use sheilded cable, but often unshielded cable is used due to cost concerns. Microphone cables are also easily confused with DMX cables and can be swapped in a pinch but the problems you experiencing are one reason that its not ideal.

 

I think I have used the same fixtures before, make sure you take them out of sound reactive mode.

 

Some of the early units did not have the ability to support the full 512 address range for DMX. It is possible that you have something else in the same address range? If I recall these use 6 dmx channels so is it possible that you have an address set incorrectly?
Sharyn

 

Mic cable is rated at 80 Ohms. True DMX cable is rated at 120 Ohms and is constructed using twisted pairs. We build our DMX cables using Duraflex cable which is also double shielded - both a braid and foil shields. Never had a problem.

 

I believe that DMX thread is my fault

Use the 120 (not 100) ohm resistor if in doubt and as above, make sure it is properly terminated. However, I am having no problems using no terminator, but we're using the highest-quality DMX cable.

 

I KNOw this is bound to cause quite a stir, but if you look at Martin's gear for instance they say you can use mic cable but insist on the termination resistor

I think you will find that using the 120ohm resistor terminator cleans up a lot of the problems with mic cable, and that using "proper" dmx cable, reduces the need for the terminator

Now that more and more people are going cat5 it is getting to be less of an issue

Sharyn

 

There's nothing wrong with any of it. Your "problem" is that most ADJ fixtures go sound active when there is no dmx detected. Since the power draw on those is so low, maybe you could just run them into a power strip or something and shut them off when not needed.

 

The new 250 series all has 3 and 5 pin connections. The 700 series probably does, too. I don't know about data returns on pin 3, but they do use 5 pin connections.

And the HES StudioSpot 250 doesn't have a 5 pin connection, either.

 

I think if you analyse it electrically, adding the 120 ohm resistor compensates for the 80 ohm mic cable. It would be interesting to have a lab do a sweep on the cables and really do an analysis. It is like networking as you say, I remember when unless you used rg58 coax thin net as it was called then would not work, but it was the early work with Synoptics with a product called lattis net that showed that adding filtering and compensation could be effective.


Sharyn

 

Essentially - DMX is digital and Audio is analogue cable. DMX cable makes great Audio cables but the same is not always the case when using Audio cable for DMX.

That being said, it can be used and I do it if I am short on DMX cable. Main problem I have seen is "twitching" on a channel but nothing too drastic.

Search the fora for "DMX cable" and you will find several post that go into this in greater detail.

 

OK. My first 2 thots would be bad data getting there (some hidden thing emanating from your desk) or bad cabling somewhere.

As an intermediate solution, maybe you could write a cue to take all of them to 0% when not in use?

Edit: One other thot is that you have them addressed too high. If memory serves, the ADJ LED Par can't be addressed higher than 126 or something.

 

What happens when you isolate the units? i.e., remove them from their current position and plug them directly into the desk? If it still does it, try a different DMX cable. The other thought is that these may not have been designed for anything more than being held on a single colour (for truss warming), for slow colour changes or for sound to light mode. I am not bagging ADJ gear, just pointing out that in order to produce budget equipment, there are often things that get missed out.

If you cannot find a solution then the cue that Len suggested will probably be your best bet.

 

this is like a thriller for me, I really wanna see the outcome of this...