Thank you for your kind note.
The recent changes in "passive" -- dropping down to passive adapter if a
DS2480B chip isn't detected is because we now check many com port
combinations with long timeouts before declaring a DS2480B failure (flow
control, baud rates, ...)
Paul Alfille
On Tue, Jan 3, 2012 at 9:01 AM, Kurt Forsberg <kurt.forsb...@gmail.com>wrote:
> Hello,
>
> First of all, I'd like to thank Paul and the other developers for an
> awesome piece of software. I've been using it for several years now
> and have found it immensely useful. I suppose I should have
> subscribed to this list long ago, but I only just now got around to
> it. I apologize if this topic has already been discussed at length.
>
> I just wanted to share my experiences with bus masters and see if
> anyone can share their experience/wisdom with me. In the past I used
> DS2480B based adapters. A couple years ago I had a problem with one
> of them. After performing well (I hesitate to say "flawlessly") for
> well over a year, I started experiencing stability issues. The 1-wire
> network would become unresponsive. I isolated the problem to the bus
> master. The only way to bring it back up was to unmount OWFS, power
> cycle the bus master, and remount OWFS. This was kind of a pain in
> the butt, since I wasn't always physically near the hardware when the
> problem occurred. At first it only happened every few weeks, but it
> got to the point that it was happening almost daily. I happened to
> have a MAX232 in a DB9 shell laying around. As an experiment, I
> soldered the input and output of the +5v side together and used that
> to drive the 1-wire bus. The internal pullup resistance of the MAX232
> is only 300 ohms -- significantly less than other 1-wire bus masters
> -- but it hasn't seemed to be an issue in the 2+ years that I've been
> using it. OWFS detects it as a passive adapter. I have since set up
> several systems using these incredibly inexpensive (around $2-$3
> including the connector and shell) adapters.
>
> A few months ago I was building another system. The most recent OWFS
> release (presumably 2.8p12) did not detect the bus master. I passed
> it off as a bug (irresponsibly not reporting it), installed an older
> version, and went on my merry way. The other day I was setting up yet
> another system with 2.8p14 and experienced the same problem. This
> time, rather than reverting to an older version, I searched the
> mailing list archive and quickly found the thread from 12-8 to 12-11
> about a passive adapter not working. I was able to solve my problem
> by using --passive=/dev/ttyS0 rather than -d /dev/ttyS0.
>
> At this point, I'm perfectly happy using my "passive" adapters, but
> I'm just curious if anyone else has experienced similar trouble with
> DS2480B adapters or any others. I'm also curious whether using a
> "smart" bus master could give me a noticeable performance improvement.
>
> Thanks,
>
> Kurt Forsberg
>
>
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