"John Nagle" <na...@animats.com> wrote in message news:jse604$1cq$1...@dont-email.me... > On 6/26/2012 9:12 PM, Adam wrote: >> Host OS: Ubuntu 10.04 LTS >> Guest OS: Windows XP Pro SP3 >> >> >> I am able to open port COM4 with Terminal emulator. >> >> So, what can cause PySerial to generate the following error ... >> >> C:\Wattcher>python wattcher.py >> Traceback (most recent call last): >> File "wattcher.py", line 56, in <module> >> ser.open() >> File "C:\Python25\Lib\site-packages\serial\serialwin32.py", line 56, >> in >> open >> raise SerialException("could not open port %s: %s" % (self.portstr, >> ctypes.WinError())) >> serial.serialutil.SerialException: could not open port COM4: [Error 5] >> Access is denied. > > Are you trying to access serial ports from a virtual machine? > Which virtual machine environment? Xen? VMware? QEmu? VirtualBox? > I wouldn't expect that to work in most of those. > > What is "COM4", anyway? Few machines today actually have four > serial ports. Is some device emulating a serial port? > > John Nagle >
Thanks, and yes, I am using VirtualBox. My laptop does not have a serial port so I use a USB-to-serial converter, which is assigned COM4. -- http://mail.python.org/mailman/listinfo/python-list
