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Subject:	2nd Try 1.57 on Win2k or WinXP. Not more than 16 com ports. Differences between //./comX and /dev/comX
Date:	Tue, 20 Apr 2004 09:58:40 +0200
Message-ID:	<C2F0FC2A5C4B3E44ADF4327E699486A509F52B@mail2.de.thorlabs.local>
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From:	=?iso-8859-1?Q?Lutz_H=F6rl?= <lhoerl AT thorlabs DOT com>
To:	<cygwin AT cygwin DOT com>
X-MIME-Autoconverted:	from quoted-printable to 8bit by delorie.com id i3K7xJKv025343

Hello,

thank you Corinna, your message removed some of my headache.


May I ask to confirm and eventually add to documentation?

1. cygwin does support 16 serial deviecs with 'dev/com1' to '/dev/com16'
2. By using Windows names like '//./com1' cygwin does not recognize the
   interfaces as interfaces but as ordinary files.
3. If you want to use serial interfaces in a 'hardware' oriented approach
   (i.e. read out the modem lines DCD, DSR, change the interface settings
   baudrate, parity, etc. etc.) you should only use Win32-API functions.

May I additionally ask?
- is there a reason on limiting to 16 supported serial interfaces in Cygwin?
- if no, is it an idead to increase this number?
- I used the POSIX functions read() write() and select() to communicate
  with my serial interfaces and the Win32-API functions to set baudrate and
  to get modem line status. It worked until now.
  Are there hidden pitfalls ?
  Are there POSIX/Cygwin functions to do the same job ?


Again, thank you very much for your Help.


Lutz Hoerl
M A I L    lhoerl at thorlabs dot com

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