[sebhc] H8 optoisolators - aka: disk transfer program

Steve Thatcher melamy at earthlink.net
Fri Jun 18 05:16:32 CDT 2004

I would suspect that it is not an optoisolator problem, but rather the components around it. If someone can direct me to the correct schematic, I could probably recommend value changes for the other components that would allow it to work at 9600 baud reliably.

best regards, Steve Thatcher

-----Original Message-----
From: Scott LaBombard <labomb at rochester.rr.com>
Sent: Jun 17, 2004 11:00 PM
To: sebhc at sebhc.org
Subject: Re: [sebhc] Disk transfer program

> I'm also adding some information on how to slow
> the serial speed for the H8-5 boards. It seems that
> some of the optical isolators used here don't do
> well at 9600 baud.

I can vouch for that ... one of my H8-5's had an issue
at 9600 baud ...it turned out to be an opto isolator as
Dwight suggests.

I also had a bad 4N26 isolator on one of my H9's that
caused the same issue at that baud rate (but, as was the
case with the H8-5, worked fine at lower buad rates)...
go figure. Pretty consistent issue it seems ...


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