Control Line Menu

When you connect to a dial-up modem, see the following for details on duplex setting in a serial port.

Control Line Menu

Modem	Duplex Status	Controller	Function Choice	Continuous Carrier
Not using a modem	–		No handshaking	–
Using a modem	Modems in a point-to-point link are full-duplex.	–	Full-duplex
	Modems in a point-to-point link are full-duplex.	Master controller	Full-duplex
	–	Slave controller	Half-duplex	Select the continuous carrier checkbox.
	All modems in a system are half-duplex.	–	Half-duplex	Clear the continuous carrier checkbox (default).