S Registers - IBM Aptiva Handbook

S registers

Table 18 lists the S registers used by your computer. S registers are information storage areas inside the modem. The
AT command set uses the S registers to configure modem options. Some S registers have default settings. For normal
modem operations, the default settings are usually adequate. However, special circumstances may require you to
change some defaults. To change or read the value of an S register, begin the command with the letters AT.
To read the value of an S register, use the ATSr? command (r=register number 0-28). For example, to read the value of
S register 0, type ATS0? and press Enter.
To change the value of an S register, use the ATSr=n command (r=register number 0-28, n=the new value you want to
assign). For example, to change the value of S register 0 to 20 rings, type ATS0=20 and press Enter.
Table 18: S registers
Register Function
S0 Automatic answer ring number
S1 Ring counter
S2 Escape code character
S3 Command line termination character (carriage return)
S4 Response formatting character (line feed)
S5 Command line editing character (backspace)
S6 Dial tone wait time
S7 Connection completion time out
S8 Comma pause time
S10 Automatic disconnect delay
S11 Touch-tone (DTMF) dialing speed
S12 Escape character detect time
174 Appendix C: Modem information
Range / units
0-255 / rings
0-255 / rings
0-255 / ASCII
0-127 / ASCII
0-127 / ASCII
0-127 / ASCII
2-65 / seconds
1-255 / seconds
0-65 / seconds
1-254 / 10ths of a second
50-150 / milliseconds
0-255 / 50ths of a second
Default
0
0
43
13
10
8
2
50
2
20
95
50