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MultiModemISI Hybrid Series, ISIHI-2S 157
Appendix
Appendix J: S-Register Summary (Modem)
Register Unit Range Default Description
S0 1 ring 0, 1–255 0 Sets the number of rings before the modem answers. ATS0=0 disables
auto answer completely.
S1 1 ring 0–255 0 Counts the rings that have occurred.
S2 decimal 0–255 43 (+) Sets ASCII code for the escape code character. Values greater than 1227
disable the escape sequence.
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. Values greater than 32
disable the backspace character.
S6 1 sec 2–65 2 Sets the time the modem waits for a dial tone before canceling the call.
4–255 4
4–7
S7 1 sec 1–255 50 Sets the time the modem waits for a carrier signal before aborting a call.
1–45 45 Also sets the wait for silence time for the @ dial modifier.
1–55 55
S8 1 sec 0–65 2 Sets length of pause caused by a comma character in a dialing command.
4–255
4–7 4
44
S10 100 ms 1–254 20 Sets how long a carrier signal must be lost before modem disconnects.
S11 1 ms 50–150 95 Sets spacing and duration of dialing tones. 50 ms is the minimum allowed.
80–255 80
80–255
S28 decimal 0, 1–255 1 0 disables, 1–255 enables V.34 modulation.
S35 decimal 0–1 0 0 disables, 1 enables the V.25 data calling tone, which allows data/fax/
voice discrimination.
S37 decimal 01–19 0 Sets the maximum dial line rate.
0 = maximum speed
1 = reserved 11 = 14400 bps
2 = 1200/75 bps 12 = 168000 bps
3 = 300 bps 13 = 19200 bps
4 = reserved 14 = 21600 bps
5 = 1200 bps 15 = 24000 bps
6 = 2400 bps 16 = 26400 bps
7 = 4800 bps 17 = 28800 bps
8 = 7200 bps 18 = 31000 bps
9 = 9600 bps 19 = 33600 bps
10 = 12000 bps
S42 decimal 0–1 10
For testing and debugging only.
Enables / disables V.32bis and V.22bis auto rate. Retrain and fallback are
disabled in data mode.
0 = disable; 1 = enable.
S43 decimal 0–1 1
For testing and debugging only.
Enables / disables V.32bis start-up auto mode operation.
0 = disable, 1 = enable.
S89 1 sec 0, 5-255 10 Sets the length of time in the off-line command mode before the modem
goes into standby mode. A value of zero prevents standby mode; a value
of 1-4 sets the value to 5.