linuxaudio.org

On November 1, 2009 10:47:44 am Jörn Nettingsmeier wrote:

quoted text
> hi everyone!

>

>

> i'm playing with my shiny new BCF2K, and i'm going to use it some

> distance from my machine, so i'm going to try a midi link instead of USB.

>

> what is the maximum length of midi chain that you have used without

> problems? i read somewhere that no more than 15 meters are recommended,

> which strikes me as pretty short even if it's unbalanced.

>

>

> my idea is to abuse a cat5 cable as a triple midi loom - do you think

> that could work? pinout would be as follows:

15 meters is a recommendation based on typical cables used in a simple system.

Data corruption ensues somewhere after 15m, depending on cable quality, EMI,

and so forth. I would imagine a CAT5 as having better shielding and IIRC runs

for that are advised to somewhere up to 50m. Different frequency ranges though,

so signal loss/degradation per meter may vary.
Usually you need a buffer/booster box for any regular MIDI cable runs greater

than 15m.
You can also use professional microphone cables for MIDI with DIN plugs. That

might get you a little better EMI rejection and hence a longer run also.
A CAT5 cable should work, as long as the pairs of signal/grounds are really

twisted together. Hum and crosstalk may be a factor otherwise.
Raymond
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