M200 interfacing continues...

From: John Lawson <jpl15_at_panix.com>
Date: Thu Jan 2 14:47:01 2003

On Thu, 2 Jan 2003, Peter C. Wallace wrote:

>
> The resting state (0) will be determined by the M200, With a pullup the signal
> will be high when the M200 is not connected, but I doubt if that matters...

 Certainly you are correct in the generic case, and I would have thought
so to. However: from speaking w/Sellam on the phone regarding this, it
seems that M200 is not 'zeroing' that pin well, so I suggested
pull-downs... without a resistor the pin floats around... not exactly
sure on a molecular level whats going on, but it probaly has to do with
competing power supplies... anyway, I'm curious to see if changing to 5K
or 10K will solve the problem...

  But certainly this whole subject is producing a good deal of information
which should prove useful to the next person who has a similar interfacing
task!

   Cheers

John
Received on Thu Jan 02 2003 - 14:47:01 GMT