Windows raises serial port DTR signal at boot?

[Arnau Font]

Hi,

I've got a device that expects to receive a DTR signal from a serial port to
perform certain actions. This device is always connected, and I've seen that
if I boot windows XP, the device receives some DTR signals during the
Windows XP logo screen.

I've read that this is because Windows is looking for devices connected to
the serial port, and that I should add /FASTDETECT to the boot.ini to
disable this feature. But, I've added it and windows continues to send some
signals to my device. How can I solve that??

Thanks!

 

[Arnau Font]

Hi,

I've modified the registry, in the
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\ACPI\PNP0501\1\Device
Parameters, adding a SkipEnumeration key (and setting it to 1), so it skips
the boot search for a device.

Will the key be the same in all computers?

Thanks!

 

[renton]

Hi Arnau,

I had the same problem, I will try to solve it adding /FASTDETECT t
boot.ini and if it doesn't work I will add that key to the registry.

What kind of key is SkipEnumeration?

Regards

 

[renton]

It just didn't work, I already had FASTDETECT added and addin
skipenumeration to the registry didn't make any difference.

I finally used another machine with w2k.

regards,
Rento