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 S - S-registers

 ATSx=y  Set S-register "x" to "y".
 ATSx?   Read back S-register "x".

                             Factory
 Reg.    Range       Units   Setting     Description

 S0*     0-255       Rings       0       Ring number to answer
 S1      0-255       Rings               Rings counted so far
 S2      0-127       ASCII    43 ("+")   Escape character code
 S3      0-127       ASCII    13 (CR)    Carriage-return character
 S4      0-127       ASCII    10 (LF)    Line-feed character
 S5      0-32,127    ASCII     8 (BS)    Backspace character
 S6      0-255       Seconds     2       Wait for dial tone
 S7      1-55        Seconds     30      Wait for data carrier
 S8      0-255       Seconds     2       Pause for "," in dial string
 S9      1-255       1/10 sec.   6       Carrier detect response time
 S10     1-255       1/10 sec.   14      Lost carrier hangup delay
 S11     50-255      1/20 sec.   95      Touch-tone dialing speed
 S12     20-255      1/50 sec.   50      Escape command guard time
 S13                                     Reserved
 S14*                            AA hex  Bit-mapped option register
 S15                                     Reserved
 S16                             0       Modem test options
 S17                                     Reserved
 S18*    0-255       Seconds     0       Test timer
 S19                                     Reserved
 S20                                     Reserved
 S21*                            0       Bit-mapped option register
 S22*                            76 hex  Bit-mapped option register
 S23*                            7       Bit-mapped option register
 S24                                     Reserved
 S25*    0-255       1/100 sec.  5       DTR loss to hangup time
 S26                                     Reserved
 S27*                            40 hex  Bit-mapped option register

 * = saved by "AT&W" command