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5-8 Using the AT Automatic Calling Interface
Using the
AT ACU
If ATD is issued while the modem is in escape mode or remote configuration, the
modem responds with:
ERROR
NOTE: Any invalid characters inserted into the dial string will be ignored.
ATH, Hang Up
You may hang up the modem after entering the online escape mode by typing ATH
or ATH0. Typing ATH1 while in command mode causes the modem to Busy Out
until either the ATH command is entered or the key is pressed. NOTE: For busy
out, make certain that the TELCO OPT’S Telco option is set for RJ4MB.
ATI, Display Software Information
The messages described above are displayed in addition to the “OK” sent when AT
command processing is complete. NOTE: If this command is the last or only
command in a command line, an additional “OK” message follows the above
responses.
ATO, Leave Command Mode
This command can be used only when the modem is in the online escape mode, or
after a “;” (semicolon) dial modifier in a dial string.
The user may leave escape mode and return to data mode by typing ATO or ATO0.
If a retrain is desired while returning to data mode, ATO1 must be used.
If this command is issued while the modem is disconnected from the phone line, the
modem responds with:
NO CARRIER
If this command is issued while the modem is in a remote configuration session, the
modem responds with:
ERROR
NOTE: If the ATO command is issued after a “;” (semicolon) dial modifier (return
to command state after dialing), the modem trains as an originate modem.
Settings:
0, Modem hangs up
1, Busy Out the modem
Fo rm a t:
AT H n< C R >
Settings:
0, Displays 960
1, Displays 000
2, Displays OK
9, Displays reason for last disconnect
Fo rm a t:
AT In < C R >
Settings:
0, Leave command mode and return online
1, Leave command mode, return online, and initiate a retrain
Fo rm a t:
AT 0 n< C R >