Hello Joop,
Thanks for the pointer.
I am slowly achieving the confidence to tackle my XP Pro registry.
Stan, W1LE
On 5/12/2011 4:12 AM, Joop wrote:
quote: [On the tab "Port Settings" click "Advanced" and in that window
uncheck the
box next to "Serial Enumerator"]
This is a feature of the FTDI driver. Not something generic.
What worked for me was to disable (postpone actually) the Windows PnP
device enumerator for a serial device. It works for hardware serial
ports as well as the USBtoRS232 converters.
This can be done with a registry patch which adds the
"Skipenumerations" registry entry. Setting this to a big value skips
the possible detection of any device (such as a serial mouse) on a COM
port.
Search the net for details. E.g. here :
http://support.microsoft.com/default.aspx?scid=kb;en-us;283063
Lots of the USBtoRS232 converters do not contain EEPROM to store a
unique serial number. Without it Windows cannot be sure you unplugged
the same device as you re-plugged in another USB port. Its behaviour
is to assign it a new COM port number. Re-plugging the converter in
the original USB port should bring back the same COM port number.
You will need to patch the registry again if a new COM port number is
assigned. If you want to avoid this, look for USBtoRS232 converters
that have the option to program a USB serial number (like the FTDI
FT232R based ones)
Joop - pe1cqp
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