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Ethernet+Modem/Fax PC Card User’s Guide
B-6 Modem AT Commands and S-Registers
S-registers are 8-bit status registers where modems store most of their
configuration information. You can use the AT commands to modify the
features of the modem’s operation by writing directly into these registers.
The following is a summary of your modem’s S-Registers:
Table B.2 S-Register Summary
Registry Description Range Unit
S0 Rings to auto answer 0 - 255 ring
S1 Ring counter 0 - 255 ring
S2 Escape code character 0 - 127 ASCII
S3 Return character 0 - 127 ASCII
S4 Line feed character 0 - 127 ASCII
S5 Backspace character 0 - 127 ASCII
S6 Wait time for dial tone 2 - 255 sec
S7 Abort timer 1 - 255 sec
S8 Pause time of dial delay 0 - 255 sec
S9 Carrieir detect response time 1 - 255 sec
S10 Carrier loss disconnect delay timer 1 - 255 sec
S11 DTMF tone duration 1 - 255 sec
S12 Escape code guard time 0 - 255 sec
S24 Sleep inactivity timer 0 - 255 sec
S25 Delay to DTR off 0 - 255 0.01 sec
S26 RTS to CTS delay 0 - 255 0.01 sec
S29 Flash dial modifier time 0 - 255 0.01 sec
S30 Inactivity timer 0 - 255 10 sec
S32 XON character 0 - 127 ASCII
S33 XOFF character 0 - 127 ASCII
S37 Line connection speed
S38 Delay before forced hangup 0 - 255 sec