Multi-Tech Systems MULTIMODEM MT2834ZDX - Manual (Page 18)

Chapter 3 – AT Commands, S-Registers, and Results Codes
Multi-Tech Systems, Inc. MT2834ZDX User's Guide 18
S-Registers
Certain modem values, or parameters, are stored in memory locations called S-registers. Use the S command to
read or to alter the contents of S-Registers (see previous section).
Register Unit Range Default Description
Register Unit Range Default Description
S0 1 ring 0, 1–255 1 Sets the number of rings until the modem answers. ATS0=0
disables autoanswer 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 Sets the time the modem will wait for a dial tone before aborting a
call.
S7 1 sec. 1–255 45 Sets the time the modem.
S8 1 sec. 0–255 2 Sets the length of a pause caused by a comma character in a
dialing command.
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
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. Recommended
minimum is 50 ms.
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
disconnects. 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.
S34 1 char 0–60 10 Sets the number of command characters allowed after +++AT.
S36 1 sec. 0, 1-255 5 Sets the time between DTR inactive and modem offhook. S36=0
disables DTR busy-out.
S37 1 sec. 0-255 5 Sets the time between DTR active and modem on-hook.
S43 decimal 28, 26,
24, 21,
19, 16,
14, 12,
96, or 48 0 Sets fixed V.34 connect speed. 28 = 28800 bps; 26 = 26400 bps;
48 = 4800 bps. 0 default disables this feature.
S48 decimal 33, 31,
28, 26,
24, 21,
19, 16,
14, 12,
96, or 48 0 Sets maximum V.34 connect speed. 33 = 33600 bps; 31 = 31200
bps;…48 = 4800 bps. 0 default disables feature (same as
S48=33).