The Serial Settings apply to the Serial Line interface.
See also the Line page.
The Line Settings are shown here for convenience.
They may be modified on the Line page.
The Protocol is shown here for convenience.
It may be modified on the Line page.
The DTR options select the conditions in which the Data Terminal Ready control signal on the Serial Line is asserted.
The DTR option TruPort causes DTR to be asserted whenever either an SMS tunnel connection is active with the Telnet Protocol RFC2217 saying that the remote DSR is asserted.
The DTR option Asserted while sending causes DTR to be asserted whenever a SMS tunnel is active.