
Chapter 5 – AT Commands,
S-Registers
Certain modem values, or parameters, are stored in memory locations called
Register | Unit | Range | Default | Description | |
S0 | 1 ring | 0, | 1 | Sets the number of rings until the modem answers. ATS0=0 disables | |
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| auto answer completely. | |
S1 | 1 ring | 0 | Counts the rings that have occurred. | ||
S2 | decimal | 43 (+) | Sets ASCII code for the escape sequence character. | ||
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| Values greater than 127 disable escape. | ||
S3 | decimal | 13 (^M) | Sets the ASCII code for the carriage return character. | ||
S4 | decimal | 10 (^J) | Sets the ASCII code for the line feed character. | ||
S5 | decimal | 8 (^H) | Sets the ASCII code for the backspace character. | ||
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| Values greater than 32 disable backspace. | ||
S6 | seconds | 2* | Sets the time the modem waits after it goes | ||
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| to dial the telephone number. | |
S7 | seconds | 50* | Sets the time the modem waits for a carrier signal before aborting a | ||
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| call. Also sets the wait for silence time for the @ dial modifier. | |
S8 | seconds | 2 | Sets the length of a pause caused by a comma character in a dialing | ||
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| command. | |
S9 | decimal | 0, | 37 (%) | Sets ASCII code for remote configuration escape character. S9=0 | |
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| disables remote configuration. | |
S10 | 100 ms | 20 | Sets how long a carrier signal must be lost before the modem | ||
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| disconnects. | |
S11 | 1 ms | 95* | Sets spacing and duration of dialing tones. | ||
S28 | decimal | 0, | 1 | 0 disables, | |
S30 | 1 minute | 0, | 0 | Sets the length of time that the modem waits before disconnecting | |
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| when no data is sent or received. A value of zero disables the timer. | |
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| See also the \T command | |
S35 | decimal | 1 | 0 disables, 1 enables the V.25 calling tone, which allows remote | ||
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| data/fax/voice discrimination. | |
S36 | decimal | 7 | Specifies the action to take in the event of a negotiation failure when | ||
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| error control is selected. (See S48.) | |
S37 | decimal | 0 | Sets the maximum V.34 “upstream” speed at which the modem | ||
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| attempts to connect. | |
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| 0 | = maximum speed |
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| 1 | = reserved |
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| 2 | = 1200/75 bps |
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| 3 | = 300 bps |
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| 4 | = reserved |
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| 5 | = 1200 bps |
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| 6 | = 2400 bps |
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| 7 | = 4800 bps |
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| 8 | = 7200 bps |
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| 9 | = 9600 bps |
10 = 12000 bps
11 = 14400 bps
12 = 16800 bps
13 = 19200 bps
14 = 21600 bps
15 = 24000 bps
16 = 26400 bps
17 = 28800 bps
SocketModem Global MT5634SMI Developer’s Guide | 40 |