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Author Topic: Y cord at DMX board  (Read 675 times)

Lyle Williams

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Re: Y cord at DMX board
« Reply #20 on: July 06, 2018, 05:02:35 pm »

The data rates in DMX are very low.  The physical length of bits on a wire are huge.

Sadly people run unterminated DMX all the time.  That is so much worse than a Y-split in the middle of a line terminated at both ends.  Put a cro on your DMX and have a look at those waveforms.

Dodgey is dodgey.  Don't plan on being dodgey.  Plan on being solid and robust, and if some technical gaffer tape needs to be applied, you may be ok.  Don't plan on operating a huge beachball of technical gaffer-tape on gaffer-tape on gaffer-tape.

But when crisis strikes (opto-splitter left in last town?) don't use learned helplessness masquerading as professionalism to fail to produce a solution that a noob would have got working.

A y-split is 1% less dodgey than letting the show fail.

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TJ (Tom) Cornish

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Re: Y cord at DMX board
« Reply #21 on: July 06, 2018, 06:27:27 pm »

The data rates in DMX are very low.  The physical length of bits on a wire are huge.

Sadly people run unterminated DMX all the time.  That is so much worse than a Y-split in the middle of a line terminated at both ends.  Put a cro on your DMX and have a look at those waveforms.

Dodgey is dodgey.  Don't plan on being dodgey.  Plan on being solid and robust, and if some technical gaffer tape needs to be applied, you may be ok.  Don't plan on operating a huge beachball of technical gaffer-tape on gaffer-tape on gaffer-tape.

But when crisis strikes (opto-splitter left in last town?) don't use learned helplessness masquerading as professionalism to fail to produce a solution that a noob would have got working.

A y-split is 1% less dodgey than letting the show fail.
A Y-cable with two unterminated ends is significantly worse than an unterminated single-ended transmission.

Not exactly sure what your point is - hopefully a successful show is worth a $100 opto-splitter to do it right the first time.
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Lyle Williams

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Re: Y cord at DMX board
« Reply #22 on: July 07, 2018, 04:28:44 pm »

Y-in-the-middle to two unterminated ends is worse.

My point was that "linear unterminated" was worse than "y-in-the-middle but terminated at bith ends".

Actually, that wasn't my key point.  My key point was don't plan on being dodgey, but understand that this whole endeavour is one big improv job.  The show must go on, and this issue isn't safety-related.
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