Follow-up Comment #2, bug #26703 (project avrdude):
correction of my previous comment:
The signal of the FTDI is inverted (in the default configuration) , so it is
in fact DTR# instead of DTR.
So the reset sequence becomes:
1. clear DTR (DTR#=+5V on the FDTI chip) for more than 2ms (suggestion: 50ms)
to discharge C13 (100nF) via R1 (10kOhm).
This step should normally not be necessary when DTR is cleared when the COM
device is closed, but especially for Bluetooth devices like the Bluegiga WT-11
of the Arduino-BT together with the Windows XP SP3 Bluetooth stack, DTR keeps
its state when the device is closed
2. set DTR (DTR#=0V on the FDTI chip) for more than 2ms to bring nRESET of
the ATmega to a 0V level
3. clear DTR on exit (DTR#=5V on the FDTI chip) for more than 2ms. This is
also especially for the WT-11.
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