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JMS USB2DMX + Enntec Pro problems

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cyaniron
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Re: JMS USB2DMX + Enntec Pro problems

Post by cyaniron »

Thanks for all the replies.

RE: JML USB2DMX
I made a little USB cable which has 66pf of capacitance between the two data lines and ground, and put it between the PC and my USB2DMX. This helped a lot, and it froze twice during the night, whereas it used to freeze a lot more.Searching around, I found that ST make a filter (http://media.digikey.com/PDF/Data%20She ... /USBUF.pdf). As my port is USB 1, and I suspect the data rates are very low, I expect I should be able to add more capacitance without affecting the data, or I might have a go at putting in some 22ohm ish resistors to see if that helps. I might try getting a clip on ferrite core to see if that helps.

RE: Enntec Pro

remco_k got it!.

I rechecked the wiring, and I have crossed pins 2-3, and 3-2. I'll rewire it, and I expect that will fix it. As it appeared to be working for 1 fixture, I didnt suspect this. D'oh


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remco_k
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Re: JMS USB2DMX + Enntec Pro problems

Post by remco_k »

cyaniron wrote:Thanks for all the replies.

RE: JML USB2DMX
I made a little USB cable which has 66pf of capacitance between the two data lines and ground, and put it between the PC and my USB2DMX. This helped a lot, and it froze twice during the night, whereas it used to freeze a lot more.Searching around, I found that ST make a filter (http://media.digikey.com/PDF/Data%20She ... /USBUF.pdf). As my port is USB 1, and I suspect the data rates are very low, I expect I should be able to add more capacitance without affecting the data, or I might have a go at putting in some 22ohm ish resistors to see if that helps. I might try getting a clip on ferrite core to see if that helps.
Try disconnecting the pin 1 (ground) on the beginning of your DMX chain. (at your interface or the first XLR connector for example). Doing that, you'll eliminate possible ground loops that maybe causing those problems. In the audio world this is called ground lift.
Be careful though, be SURE that every fixture is connected to ground properly as otherwise, there is a risk of hazard for you or other working people and defective fixtures or interface.
Some fixtures might stop working when you disconnect ground, but the way DMX signal works, should be able to keep on working without common ground. You should try that out.
remco_k got it!.

I rechecked the wiring, and I have crossed pins 2-3, and 3-2. I'll rewire it, and I expect that will fix it. As it appeared to be working for 1 fixture, I didnt suspect this. D'oh
Well, good that you sorted that out. Everyone makes a mistake every now and then.
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