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APPENDIX A. AT COMMANDS
ACTIVE Professional External Modem User’s Manual
12
+++ Escape Characters Default : +
Switch the modem from Online State to Command State without
breaking the data connection. This character can be redefined by
changing the value in S Register S2.
AT=x Write to Selected S Register
This command writes the value x to the currently selected S register. An
S register can be selected by using the ATSn command. All of the S-
register will return the OK response if x is a number.
AT? Read Selected S Register
This command reads and displays the selected S register. An S register
can be selected by using the ATSn command.
ATA Answer
This must be the last command entered into the command line. The
modem proceeds with the connect sequence in answer mode. The
modem will enter the connect state after exchanging carrier with the
remote modem. If no carrier is detected within a wait period specified in
register S7(default = 50 seconds), the modem will disconnect. Any
character may be entered via the DTE during the connect sequence to
abort the command.
ATBn * Set ITU-T or Bell mode Default : 0
ATB0 Selects ITU-T V.22 and V.21 standards for communication at
1200 and 300bps
ATB1 Selects Bell 212A and 103 standards for communication at
1200 and 300bps
ATCn Carrier control Default : 1
This command is included for compatibility only, and has no effect
other than returning a result code.
ATC1 Normal transmit carrier switching
ATDn Dial
This must be the last command in a command line. ATD causes the
modem to go off-hook, dial according to the parameters entered, and
attempt to establish a connection.
If there are no parameters, then the modem goes off-hook in originate
mode without dialling a number.
Punctuation may be used for clarity. Parentheses, hyphens and spaces
are ignored. If an invalid character is entered, that character and all
subsequent characters in the dial string are ignored. The modem
truncates dial strings to 36 characters.
Parameters: 0-9 A B C D * # L P T R ! @ W , ; ^ S=n
0-9 DTMF digits 0 to 9