3Com PC Card manual Entering AT Commands, Answer Mode, Dial Number

28CHAPTER 5: USING THE MODEM

	Attaching this information to faxes is known as fax branding. Refer to your fax
	communication software documentation for details on how to comply with the
	fax-branding requirement.
AT Commands	AT commands are set at the factory (factory settings are called defaults) to
	perform specific modem functions in preselected ways. They can be used to
	display call status or send and receive data with communications software such as
	HyperTerminal.
	Entering AT Commands
	AT commands are instructions typed at the command line of any communications
	application. A communications application is in command mode when the
	application is started but the modem has not yet dialed. When your application is
	in command mode, the AT commands you type are sent directly to the modem.
	The most common way to enter AT commands is from terminal mode in your
	communications software. The basic rules for entering AT commands are:
	■ All AT command lines must begin with the prefix AT.
	■ Spaces between command characters (and option characters) are ignored.
	■ Command line parameters cannot exceed 255 characters.
	■ Use a carriage return [Enter] to enter a command line. Commands take effect
		as soon as they are received.
	■ Type commands in either upper or lower case, not a combination.
	■ If you leave the number off a command, zero is assumed. For example, if you
		type ATE, ATE0 is assumed.
	A: Answer Mode
	Causes the modem to attempt a handshake in answer mode.
	D: Dial Number
	Instructs the modem to go off-hook and execute the dial string which follows the
	D. Commands which may be part of the dial string are listed below. Any
	unrecognized character in the dial string is ignored. Once dialing is complete, the
	modem attempts a handshake in originate mode (unless the R parameter is given).
	.
	0-9 Any number simply dials that number.
	A, B, C, D, # or * (tone dial only) dials the indicated symbol.
	P		Causes subsequent numbers to be pulse dialed.
	T		Causes subsequent numbers to be tone dialed.
	R		Forces the modem to dial a call in answer mode.
	W		Causes the modem to wait for a dial tone using S7 as a time out.