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S-Registers
This section defines the purpose of the modem registers, and
sequentially lists the registers and describes their functions. These
registers affect various operating characteristics and allow you to obtain
information about the modem, as well as test the modem. Each register
has a factory-set value, which you can read or change to fit your needs.
Reading a Register Value
To read the current value of a register, type: AT Sn? [ENTER], where n is a register
number.
AT Sn? Sn? [ENTER] from the command mode.
To read the register values of S0 and S1, type AT S0? S1? [ENTER].
The modem will display the first register value, a carriage return, the next register
value, a carriage return, and OK or 0.
Changing a Register Value
To change a register value, use the Sn command (ATSn=v), where n is a register number
and v is the new value you want to assign to the register. Type: AT S0=3 [ENTER] to
have the modem automatically answer on the third ring.
The following table lists the modem’s registers and their functions.
Register Range Units Default Definition
S0 0-255 rings 0 Auto-answer
S1 0-255 rings 0 Count incoming rings
S2 0-255 rings 43 Escape character value.
S3 0-127 ASCII 13 Carriage return character.
S4 0-127 ASCII 10 Line feed character.
S5 0-32 ASCII 8 Backspace character.
S6 2-255 seconds 2 Wait time for Dialing.
S7 1-255 seconds 60 Wait for carrier after dial.
S8 0-255 seconds 2 Pause time for dial delay.
S9 1-255 seconds 6/10 Carrier detect.
S10 1-255 seconds 14 (1.4) Lost Carrier to Hang Up Delay.
S11 1-255 milliseconds 95 DTMF Tone Duration.
Modem Command Reference
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