Setting up your ISP information .................................................1-16Other Operating Systems ................................................................1-17If You Are Using Windows 3.x ...................................................1-17If You Are Using MS-DOS ...........................................................1-17If You Are Using UNIX, Linux, or AIX ..........................................1-172 U SING THE AT COMMAND S ETOverview ..........................................................................................2-1General rules for using AT commands ..........................................2-1Basic AT commands .........................................................................2-2Using S-Registers ..............................................................................2-2Displaying S-Register settings .......................................................2-3Setting an S-Register ....................................................................2-3Getting a list of S-Registers ..........................................................2-4Understanding bit-mapped S-Registers ..............................................2-43 M ODES OF OPERATIONCommand and Online Modes ...........................................................3-1Entering Online Command Mode ................................................3-2Returning to Online Mode ...........................................................3-2Controlling Local Echo ......................................................................3-3Command-Mode Local Echo ........................................................3-3Online-Mode Local Echo ..............................................................3-3Data and Fax Modes .........................................................................3-44 D IALING, ANSWERING , AND H ANGING UPDialing ..............................................................................................4-1Dial options .................................................................................4-1Carrier Loss Redial .............................................................................4-3Answering Calls ................................................................................4-4Force Answer Mode .....................................................................4-4Auto Answer ...............................................................................4-4Hanging up .................................................................................4-5Making International calls .................................................................4-5Handshaking options ...................................................................4-5Guard tone ..................................................................................4-6
