Advantech ADAM-5511 Manual page 146

com_232_rx()
com_232_tx_ready()
com_232_tx_empty()
com_232_rx_empty()
com_232_flush_tx()
com_232_flush_rx()
com_232_carrier()
com_232_lower_dtr()
com_232_raise_dtr()
com_232_raise_rts()
com_232_lower_rts()
com_232_set_break()
com_232_clear_break()
com_232_set_local_loopback()
com_232_clear_local_loopback()
com_232_enable_fifo()
com_232_disable_fifo()
com_232_read_scratch_register()
com_232_write_scratch_register()
com_232_set_line_params()
com_232_get_line_status()
com_232_get_modem_status()
RS232CallBackRoutine()
modem_command()
modem_initial()
modem_handup()