3Com DIGITAL MODEM User Manual

Contents

B AT COMMANDS ,R EGISTERS , AND RESULTCODESThe 3Com Impact ISDN digital modem commands aresummarized in Table B-1, modem commands for the internalanalog modem in Table B-1, remote S registers in Table B-3,and digital modem result codes in Table B-4.AT Command Set for the 3Com ImpactDigital ModemTable B-1 summarizes the AT command set.Table B-1 AT Command Set SummaryCommand Function (Example) DescriptionA Answer incoming circuit-switcheddigital modem call (AT A)Answers an incoming call.&C Serial port CD control (AT &C2) &C0 forces CD to remain on at all times.&C1 forces CD to follow the state ofcarrier from the remote system. CD turnson after CONNECT message is sent tohost (default).&C2 forces CD to remain on excepttemporarily after disconnect.D (ATD5551234) Dials an outgoing 56/64 Kbpscircuit-switched digital connection.DT (ATDT5551234) Dials an outgoing analog modem call,using the optional V.32bis modem, at amaximum modem line speed of14.4 Kbps using touch-tone dialing.DP (ATDP5551234) Dials an outgoing analog modem call,using the optional V.32bis modem, at amaximum modem line speed of14.4 Kbps using pulse dialing.(continued)