S-Registers; Register Unit Range Default Description - Multitech MultiModem MT2834ZDX User Manual

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
S1 1 ring 0–255
S2 decimal 0–127
S3 decimal 0–127
S4 decimal 0–127
S5 decimal 0–127
S6 1 sec. 2–255
S7 1 sec. 1–255
S8
1 sec. 0–255
S9 100 ms 1–255
S10 100 ms 1–254
S11 1 ms 1–255
S13 decimal 0, 1–127 37 (%)
S17 10 ms 1–255
S24 50 ms 0–255
S25 100 ms 0, 1–255 0
S30 1 min. 0, 1–255 0
S32 100 ms 0–255
S34 1 char 0–60
S36 1 sec. 0, 1-255
S37 1 sec. 0-255
S43 decimal 28, 26,
24, 21,
19, 16,
14, 12,
96, or 48
S48 decimal 33, 31,
28, 26,
24, 21,
19, 16,
14, 12,
96, or 48
Multi-Tech Systems, Inc. MT2834ZDX User's Guide
Chapter 3 – AT Commands, S-Registers, and Results Codes
Sets the number of rings until the modem answers. ATS0=0
disables autoanswer completely.
0 Counts the rings that have occurred.
43(+) Sets ASCII code for the escape code character.
13 (^M) Sets ASCII code for the RETURN character.
10 (^J) Sets ASCII code for the LINE FEED character.
8 (^H) Sets ASCII code for the BACKSPACE character.
2 Sets the time the modem will wait for a dial tone before aborting a
call.
45 Sets the time the modem.
2 Sets the length of a pause caused by a comma character in a
dialing command.
6 Sets delay between when the modem detects a valid carrier
signal and when it turns on its CD circuit.
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.
70 Sets spacing and duration of dialing tones. Recommended
minimum is 50 ms.
Sets ASCII code for remote configuration escape character.
S13=0 disables remote configuration.
25 Sets the length of the break time (space) sent to the local PC
when the modem receives a remote break.
20 Sets the time the DSR, CTS, and CD signals drop before going
high again. Used for some PBX and CBX phone systems.
Sets the time the DTR signal must be dropped before the modem
disconnects. The 0 default equals 50 ms.
Sets how long the modem waits after the last character is
received or transmitted before it disconnects. The 0 default
disables the timer.
20 Sets the time the modem will wait for a RETURN to be entered
during escape sequence execution.
10 Sets the number of command characters allowed after +++AT.
5 Sets the time between DTR inactive and modem offhook. S36=0
disables DTR busy-out.
5 Sets the time between DTR active and modem on-hook.
0 Sets fixed V.34 connect speed. 28 = 28800 bps; 26 = 26400 bps;
48 = 4800 bps. 0 default disables this feature.
0 Sets maximum V.34 connect speed. 33 = 33600 bps; 31 = 31200
bps;...48 = 4800 bps. 0 default disables feature (same as
S48=33).
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