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B-2 APPENDIX B: AT COMMANDS, S REGISTERS, AND RESULT CODES
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).
E AT 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.
Q Result 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
(AT S60?)
Reads a specific S register setting.
Table B-1 AT Command Set Summary (continued)
Command Function (Example) Description