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Appendix F 129
S Register Definitions
S0 Autoanswer Ring Count
Sets the number of the rings required before the modem automatically answers a call. Setting this register to zero
disables autoanswer mode.
Range: 0-255
Default: 000
Units: rings
S1 Ring Count
The value of S1 is incremented with each ring. If no rings occur over an 8 second interval, this register is cleared.
Range: 0-255
Default: 000
Units: rings
S2 Escape Character (user defined)
S2 holds the decimal value of the ASCII character used as the escape character. The default value corresponds to an
ASCII +. A value over 127 disables the escape process, i.e., no escape character will be recognized.
Range: 0-255
Default: 043
Units: ASCII
S3 Carriage Return <CR> Character (user defined)
Sets the command line and result code terminator character. Pertains to asynchronous operation only.
Range: 0-127, ASCII decimal
Default: 013 (carriage return)
Units: ASCII
S4 Line Feed <LF> Character (user defined)
Sets the character recognized as a line feed. Pertains to asynchronous operation only. The line feed control
character is output after the carriage return control character if verbose result codes are used.
Range: 0-27, ASCII decimal
Default: 010 (Line Feed)
Units: ASCII
S5 Back Space <BS> Character (user defined)
Sets the character recognized as a backspace. Pertains to asynchronous operation only. The modem will not
recognize the backspace character if it is set to a value that is greater than 32 ASCII. This character can be used to
edit a command line. When the echo command is enabled, the modem echoes back to the local DTE, the backspace
character, an ASCII space character, and a second backspace character; this means a total of three characters are
transmitted each time the modem processes the backspace character.
Range: 0-127, ASCII decimal
Default: 008 (backspace)
Units: ASCII