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S-Registers Reference
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
Range: 0−255
Default: 0
Units: rings
This register determines the number of rings the modem will count before automati-
cally 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.
S1 Ring Counter
Range: 0−255
Default: 0
Units: rings
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.
S2 AT Escape Character (user defined)
Range: 0−255
Default: 43
Units: ASCII
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.