Dell Inspiron 10z (1120, Mid 2010) - Manual (Page 11)

hangup; if S1=255, the modem will not
hang up when the carrier is lost;
dropping DTR hangs up the modem
(1/10 second)
S11 Duration of the touchtone dialing tone
spacing 50-255 70 ms
S12 Guard time for the escape code (1/50
second) 0-255 50
S13 Bitmapped register. Selects the bit(s)
you want on and sets S13 to the total of
the values in the Value column. For
example, ATS13.0=17 enables bit 0
(value 1) and bit 4 (value 16) 0-255 0
1 = Reset on DTR loss
2 = Reduced non-ARQ transmit buffer
4 = Set DEL=backspace
8 = Do DS0 on DTR
16 = Do DS0 on Reset
128 = Escape code hangup
S15 Bitmapped register. 0-255 0
1 = MNP/V.42 disabled in V.22
2 = MNP/V.42 disabled in V.22bis
4 = MNP/V.42 disabled V.32, V.34
8 = Disable MNP handshake
16 = Disable MNP level 4
32 = Disable MNP level 3
64 = Unusual MNP incompatibility
128 = Disable V.42
136 = Disable V.42 detection phase
S16 Bitmapped test register. 2 = Dial test 2 0
S18 Test timer for AT command &T; when
AT&T=0 the timer is disabled. 0-255 0 sec
S19 Duration for inactivity timer; S19=0
disables the timer 0-255 0
S21 Sets error correction break length (1/100
second) 0-255 10
S22 Designates the ASCII character code
for XON 0-127 ASCII 17
S23 Designates the ASCII character code
for XOFF 0-127 ASCII 19