User`s manual

3.2 Glossary of the S Registers
S0
Number of Rings to Auto-Answer On
Assigning S0 a value from 1 to 255 configures the modem for
auto-answer mode, The modem will automatically go off-hook
and initiate a data-mode-answer mode handshake after detecting
the specified number of rings,
Range:
0-255 rings
n=0
Auto-answer mode disabled.
n = 1-255 Auto-answer mode enabled.
S1
Ring Count
Reports the number of ring signals detected by the modem. This
register is cleared to zero if no ring signals are detected within an
eight-second time interval.
Range: 0-255 rings
Default: 0 rings
S2
Escape Character
S2 specifies ASCII value for the TIES escape character. The factory
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S REGISTER REFERENCE - 3