Functions available in the win_serial_port extension:
ser_version
ser_isopen
ser_open
ser_close
ser_write
ser_read
ser_setdtr
ser_writebyte
ser_readbyte
ser_setrts
ser_inputcount

Version: 20061018.1 trial version

Open port

Port:

Setting DTR

Setting text mode

Waiting

Reading answer

List SMS

Waiting

Close port