
TECHNICAL REFERENCE
17
S-Registers
To change a setting, use the ATSr=n command, where r is the register and n is a decimal value from 0 − 255
(unless otherwise indicated).
Register Default Function
S0 0 Sets the number of rings on which to answer in Auto Answer mode. When set to 0, Auto
Answer is disabled.
S1 0 Counts and stores the number of rings from an incoming call. (S0 must be greater than 0.)
S2 43 Stores the ASCII decimal code for the escape code character. Default character is +. A value of
128 – 255 disables the escape code.
S3 13 Stores the ASCII code for the Carriage Return character. Valid range is 0 – 127.
S4 10 Stores the ASCII decimal code for the Line Feed character. Valid range is 0 – 127.
S5 8 Stores the ASCII decimal code for the Backspace character. A value of 128−255 disables the
Backspace key’s delete function.
S6 2 Sets the number of seconds the modem waits before dialling. If Xn is set to X2 or X4, this is the
time-out length if there isn't a dial tone.
S7 60 Sets the number of seconds the modem waits for a carrier.
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