Pic e GSM

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qui parla chiaramente:
Embedtronics - Nokia F-Bus Protocol made simple

For F-Bus the data terminal ready (DTR) pin must be set and the request to send (RTS) pin cleared.

quindi il pin 4 DTR al pin 6 DSR (Data Set Ready) invece il pin 7 RST al pin 8 CTS (Clear To Send)

mi pare che non ci sono dubbi.

QUI IN QUESTO PASSAGGIO INVECE MI DICE DI INVIARE 128 VOLTE 0X55

The next step is to synchronize the UART in the phone with your PC or microcontroller. This is done by sending a string of 0x55 or 'U' 128 times. Simple! The bus is now ready to be used for sending frames.

a voi