S Registers - IBM Aptiva Hardware Handbook

S registers

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. Not all of the S registers are listed here.
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 5: S registers
Register Function
S0 Auto-answer ring
S1 Ring counter
S2 Escape code character
S3 Carriage return character
S4 Line feed character
S5 Backspace character
S6 Dial tone wait time
S7 Remote carrier wait time
S8 Comma pause time
Range/units
0-255 /rings
0-255 /rings
0-127 /ASCII
0-127 /ASCII
0-127 /ASCII
0-32, 127 /ASCII
0-255 /seconds
1-255 /seconds
0-255 /seconds
Default
0
0
43
13
10
8
2
45
2
S registers 33