Table B.4. S Registers
Register | Range | Default | Function |
---|---|---|---|
S0 | 0-255 rings | 1-2 | Answer on ring number. Don't answer if 0 |
S1 | 0-255 rings | 0 | if S0 is greater than
0 this register counts the incoming
rings. |
S2 | 0-127 ASCII | 43 + | Escape to command mode character |
S2 | >127 | no ESC | |
S3 | 0-127 ASCII | 13 CR | Carriage return character |
S4 | 0-127 ASCII | 10 LF | Line feed character |
S5 | 0-32, 127 ASCII | 8 BS | Backspace character |
S6 | 2-255 seconds | 2 | Dial tone wait time (blind dialing, see Xn |
S7 | 1-255 seconds | 30-60 | Wait time for remote carrier |
S8 | 0-255 seconds | 2 | Comma pause time used in dialing |
S9 | 1-255 1/10ths second | 6 | Carrier detect time required for recognition |
S10 | 1-255 1/10ths second | 7-14 | Time between loss of carrier and hangup |
S11 | 50-255 milliseconds | 70-95 | Duration and spacing of tones when tone dialing |
S12 | 0-255 1/50th seconds | 50 | Guard time for pause around +++ command sequence |
S36 | Fallback options when error correction link fails:
| 7 | Negotiation Failure Treatment |
S37 |
| 0 | Negotiation Speed (Initial handshake) |
Many modems have dozens, even hundreds, of S registers, but only the first
dozen or so are fairly standard. They are changed with a command like
ATSn
=N
,
and examined with ATSn
? (for example,
AT S10
would tell the modem not to hang up for seven
seconds should it not hear the answering modem, and return the number of times
the phone last rang.)=70
S1?
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