Lenovo 4105, 4157, 4217 manual Appendix A. Manual modem commands, Basic AT commands

Appendix A. Manual modem commands

The following section lists commands for manually programming your modem.

Commands are accepted by the modem while it is in Command Mode. Your modem is automatically in Command Mode until you dial a number and establish a connection. Commands can be sent to your modem from a PC running communication software or any other terminal devices.

All commands sent to the modem must begin with AT and end with ENTER. All commands can be typed in either upper or lower case, but not mixed. To make the command line more readable, spaces can be inserted between commands. If you omit a parameter from a command that requires one, it is just like specifying a parameter of 0.

Example:

ATH [ENTER]

Basic AT commands

In the following listings, all default settings are printed in bold text.

Command		Function
A		Manually answer incoming call.
A/		Repeat last command executed. Do not precede A/ with AT
		or follow with ENTER.
D_		0 - 9, A-D, # and *
	L	last number redial
	P	pulse dialing
		Note: Pulse dialing is not supported for Australia, New
		Zealand, Norway, and South Africa.
	T	touch-tone dialing
	W	wait for second dial tone
	,	pause
	@	wait for five seconds of silence
	!	flash
	;	return to Command Mode after dialing
DS=n		Dial one of the four telephone numbers (n=0-3) stored in the
		modem non-volatile memory.
E_	E0	Commands are not echoed
	E1	Commands are echoed
+++		Escape Characters - Switch from Data Mode to Command
		Mode (T.I.E.S. Command)
H_	H0	Force modem on-hook (hang up)
	H1	Force modem off-hook (make busy)
		Note: H1 command is not supported for Italy

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