S-Registers
Register | Function | Range | Units | Saved | Default | |
| Rings to |
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S0 | Sets the number of rings required before the | Rings | * | 0 | ||
Digi Device Server automatically answers a | ||||||
| call. Setting this register to Zero disables auto- |
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| answer mode. |
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| Ring Counter |
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S1 | S1 is incremented each time the modem | Rings |
| 0 | ||
detects a ring signal on the telephone line. S1 |
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| is cleared if no rings occur over an eight sec- |
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| ond interval. |
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| Escape Character |
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| S2 holds the decimal value of the ASCII char- |
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S2 | acter used as the escape character. The | ASCII | * | 43 | ||
default value corresponds to an ASCII ’+’. A | ||||||
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| value over 127 disables the escape process, |
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| i.e., no escape character will be recognized. |
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| Carriage Return Character |
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S3 | Sets the command line and result code termi- | ASCII |
| 13 | ||
nator character. Pertains to asynchronous |
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| operation only. |
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| Line Feed Character |
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| Sets the character recognized as a line feed. |
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S4 | Pertains to asynchronous operation only. The | ASCII |
| 10 | ||
Line Feed control character is output after the |
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| Carriage Return control character if verbose |
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| result codes are used. |
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| Backspace Character |
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| Sets the character recognized as a backspace. |
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| Pertains to asynchronous operation only. The |
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| modem will not recognize the Backspace char- |
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| acter if it is set to a value that is greater than 32 |
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S5 | ASCII. This character can be used to edit a | ASCII |
| 8 | ||
command line. When the echo command is |
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| enabled, the modem echoes back to the local |
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| DTE the Backspace character, an ASCII space |
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| character and a second Backspace character; |
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| this means a total of three characters are trans- |
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| mitted each time the modem processes the |
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| Backspace character. |
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S6 | Accepted but ignored. | s | * | 2 | ||
S7 | Accepted but ignored. | s | * | 50 | ||
S8 | Accepted but ignored. | s | * | 2 | ||
S9 | Accepted but ignored. | 0.1 s | * | 6 | ||
S10 | Accepted but ignored. | 0.1 s | * | 14 | ||
S11 | Accepted but ignored. | 0.001 s | * | 95 | ||
| Escape Prompt Delay |
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| Defines the maximum period, in fiftieths of a |
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| second, allowed between receipt of the last |
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S12 | character of the three escape character | 0.02 s | * | 50 | ||
sequence from the DTE and sending of the OK | ||||||
| result code to the DTE. If any characters are |
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| detected during this time, the OK will not be |
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| sent. Note that sending of the OK result code |
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| does not affect entry into command mode. |
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42 | Chapter 9 Modem Emulation |
