MSP430F5359: About the BSL scripter and the COM port number (windows)

Hi.

I have a custom board running a MSP430f5359, that can and is upgraded via BSL_Scripter.

It all works fine as long as the COM port number is different than "1".

When the COM1 is selected, the following error show up in the command prompt after running the EXE file.

MODE 5xx UART 9600 COM1 PARITY
        set_option: Parametro non corretto

"Parametro non corretto" is Italian for "Incorrect parameter".

Below is the script file run by the BSL_scripter

MODE 5xx UART 9600 COM1 PARITY
VERBOSE
MASS_ERASE
RX_PASSWORD
RX_DATA_BLOCK Firmware.txt

Can anyone help me figure out what need to be written in the script file to use the COM1 (if it is possible at all)?

Davide