> > 4) Signal line ringing issues due to improper line termination?
> > Perhaps 270 ohm series resistors instead of 2000 ohm resistors?
>
> I don't want to go much below 2Kohm for other reasons, but you're
> getting close.

Wild guess(s). You shifted the 2k series resistors to the other end of the
cable and it started working? That way you get full drive to overcome cable
capacitance but retain the current limit ability you desire.

Or maybe a 1k at each end of the cable. Same reason as above.

But from what you have said about observed signal shape on the scope I
doubt I'm on the right track.

Brent.



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Brent Brown, Electronic Design Solutions
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Ph/fax: +64 7 849 0069
Mobile/txt: 025 334 069
eMail:  brent.brown@clear.net.nz

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