When I try to run the example program scan.py (included below), or any
other program using pyserial, as soon as it hits the statement:

s = serial.Serial(i)

I get the error:

Traceback (most recent call last):
   File "C:\Python25\Doc\PySerial Examples\scan.py", line 26, in <module>
     for n,s in scan():
   File "C:\Python25\Doc\PySerial Examples\scan.py", line 17, in scan
     s = serial.Serial(i)
   File "C:\Python25\Lib\site-packages\serial\serialutil.py", line 156,
in __init__
     self.open()
   File "C:\Python25\lib\site-packages\serial\serialwin32.py", line 57,
in open
     win32file.SetupComm(self.hComPort, 4096, 4096)
error: (1, 'SetupComm', 'Incorrect function.')

What do I need to do to fix this? Thanks for the help!

   -- Ron

The example program scan.py (from the pyserial examples folder):
-----------------------------------------------
#!/usr/bin/env python
"""Scan for serial ports.
Part of pySerial (http://pyserial.sf.net)  (C)2002-2003 <cliec@gmx.net>

The scan function of this module tries to open each port number
from 0 to 255 and it builds a list of those ports where this was
successful.
"""

import serial

def scan():
     """scan for available ports. return a list of tuples (num, name)"""
     available = []
     for i in range(256):
         try:
             s = serial.Serial(i)
             available.append( (i, s.portstr))
             s.close()   #explicit close 'cause of delayed GC in java
         except serial.SerialException:
             pass
     return available

        Something glitched in win32? Sorry, I don't know... However, since
those are Python source files, you could always plug in some debugging
lines around that win32 call to see what actually is there. Do you have
any unnatural serial ports on the machine? (Like a USB<>serial
converter?)