Advantech ADAM-5511 Manual page 150

port_set_modem_control_params()
port_lower_dtr()
port_raise_dtr()
port_raise_rts()
port_lower_rts()
modem_initial_90()
modem_command_90()
modem_command_state_90()
modem_autoanswer_90()
modem_dial_90()
modem_handup_90()
port_flush_rx()
port_flush_tx()
port_rx_error()
port_rx_ready()
char port_rx()
port_tx_empty()
port_tx()
port_tx_string()