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Host-Based Controller Modem Data Addendum
AT Command Set June 15, 1998
29 Version 1.0 Lucent Technologies Inc.
AT Commands Reference S-Registers
S-registers generally affect how the AT commands perform. Contents of the registers can be displayed or
modified when the modem is in command mode.
To display the value of an S-register:
TYPE: ATSn? where n is the register number.
PRESS: Enter
To modify the value of an S-register:
TYPE: ATSn = r
where n is the register number, and r is the new register value.
PRESS: Enter
S0 Auto Answer Ring Number
This register determines the number of rings the modem will count before automatically answering a call. Enter 0
(zero) if you do not want the modem to automatically answer at all. When disabled, the modem can only answer
with an ATA command.
Range: 0—255
Default: 0
Units: rings
S1 Ring Counter
This register, Ring Counter, is read only. The value of S1 is incremented with each ring. If no rings occur over a
six second interval, this register is cleared.
Range: 0—255
Default: 0
Units: rings
S2 AT Escape Character (user defined)
This register determines the ASCII valued used for an escape sequence. The default is the + character. The
escape sequence allows the modem to exit data mode and enter command mode when on-line. Values greater
than 127 disable the escape sequence.
Range: 0—255
Default: 43
Units: ASCII
S3 Command Line Termination Character (user defined)
This register determines the ASCII values as the carriage return character. This character is used to end
command lines and result codes.
Range: 0—127, ASCII decimal
Default: 13 (carriage return)
Units: ASCII
Note: This register value is not stored with &W command.