3Com ISDN Modem Function Example Description ATDD5551234, DTR control AT &D0, From host, AT S60?

B-2 APPENDIX B: AT COMMANDS, S REGISTERS, AND RESULT CODES

Table B-1 AT Command Set Summary (continued)

Command	Function (Example)	Description
DD	(ATDD5551234)	Dials an outgoing TollMizer connection.
&D	DTR control (AT &D0)	&D0 causes ISDN modem to ignore DTR
		from host.
		&D1 causes ISDN modem to enter
		command state on detecting on-off
		transition of DTR.
		&D2 causes ISDN modem to hang up
		current calls upon on-off transition of DTR
		and prepares serial port to accept AT
		command at any speed (default).

EAT command echo (AT E0) E0 disables the echo of AT commands back to the host computer.

		E1 enables the echo of AT commands to
		the host computer (default).
&F	Restore factory defaults (AT &F)	Restores all factory default settings.
H	Hang up (AT H)	Hangs up the current connections.
I	Identification (AT I)	I displays the model number.
\N	Call Logging	\N displays the five latest incoming and
		outgoing calls over the data and analog
		ports. \N0 will clear this information.

O Enter connect state (AT O)

Causes the ISDN modem to go out of command mode into on-line mode.

QResult code control (AT Q0) Q0 enables the output of result codes (default).

		Q1 disables the output of result codes.
		Q2 disables the output of result codes in
		answer mode only.
\Q	Serial port flow control (AT \Q1)	\Q0 disables flow control.
		\Q1 enables bidirectional XON/XOFF
		software flow control.
		\Q3 enables bidirectional RTS/CTS
		hardware flow control (default).
%R	Read all S registers (AT %R)	Provides an output list of all S registers.
%S	Serial number	Displays serial number of ISDN modem.
Sn?	Read configuration register	Reads a specific S register setting.
	(AT S60?)