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Appendix
Appendix D

S-Register Summary

Register Unit Range Default Description
S0
1 ring 0, 1–255 1 Sets the number of rings until the modem answers.
ATS0=0
disables auto answer completely.
S1
1 ring 0–255 0 Counts the rings that have occurred.
S2
decimal 0–127 43 (+) Sets ASCII code for the escape code character.
S3
decimal 0–127 13 (^M) Sets ASCII code for the RETURN character.
S4
decimal 0–127 10 (^J) Sets ASCII code for the LINE FEED character.
S5
decimal 0–127 8 (^H) Sets ASCII code for the BACKSPACE character.
S6
1 sec 2–255 2 Time the modem waits for a dial tone before aborting a call.
4–255† 4†
4–7‡ 4‡
S7
1 sec 1–255 45 Time the modem waits for a carrier signal before aborting a call.
1–45* 45*
1–55‡ 55‡
S8
1 sec 0–255 2 Length of the pause by a comma character in a dialing command.
4–255† 4†
4–7‡ 4‡
S9
100 ms 1–255 6 Sets delay between when the modem detects a valid carrier
signal and when it turns on its CD circuit.
S10
100 ms 1–254, 7 Sets how long a carrier signal must be lost before the modem
255 disconnects. S10=255 causes the modem to not disconnect with
loss of carrier.
S11
1 ms 1–255 70 Sets spacing and duration of dialing tones. 50 ms is the
80-255* 80* recommended minimum.
80-255‡ 80‡
S13
decimal 0, 1–127 37 (%) Sets ASCII code for remote configuration escape character.
S13=0 disables remote configuration.
S17
10 ms 1–255 25 Sets the length of the break time (space) sent to the local PC
when the modem receives a remote break.
S24
50 ms 0–255 20 Sets the time the DSR, CTS, and CD signals drop before going
high again. Used for some PBX and CBX phone systems.
S25
100 ms 0, 1–255 0 Sets the time the DTR signal must be dropped before the modem
dis-connects. The 0 default equals 50 ms.
S30
1 min. 0, 1–255 0 Sets how long the modem waits after the last character is
received or transmitted before it disconnects. The 0 default
disables the timer.
S32
100 ms 0–255 20 Sets the time the modem will wait for a RETURN to be entered
during escape sequence execution.