On Wed, 10 Jan 2007 07:55:54 +1000, Adrian Jansen <adrian@qq.vv.net>
wrote in <12q83rvd31pcl92@corp.supernews.com>:

>John Navas wrote:

>> My 2nd try, a generic adapter based on the Prolific PL-2303 chip, was
>> successful -- it plays very well with Windows XP and with my GPS units.
>> (Prolific-based adapters are used by a number of major OEMs.) ...

>> Although the adapter as supplied by TekGems comes with drivers on a mini
>> CD, later drivers for Windows (2.0.2.1, XP Logo Certified), Mac, and Red
>> Hat Linux, can be downloaded directly from Prolific. ...

>We have less problems with USB-Serial devices using FTDI chips than
>those based on the Prolific ones.
>Especially when sending short messages back and forth between PC and
>device, sometimes the Prolific ones need special setups buried way down
>in the Windoze serial comms control system.

Were you using older Prolific driver versions? I've now run a fair
number of torture tests against my Prolific PL-2303 with the Windows XP
driver 2.0.2.1, and all were passed successfully. If you're got
something legitimate that you think will cause it to fail, I'd be happy
to try it. (My posting email address is valid.)

--
Best regards,
John Navas