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YML545
Appendix B: S-Registers
S-registers generally affect how the AT commands perform. Contents of the registers can be
displayed or modified when the modem is in command mode.
To display the value of an S-register:
TYPE: ATSn? where n is the register number.
PRESS: Enter
To modify the value of an S-register:
TYPE: ATSn = r where n is the register number, and r is the new register value.
PRESS: Enter
S0 Auto Answer Ring Number
This register determines the number of rings the modem will count before automatically
answering a call. Enter 0 (zero) if you do not want the modem to automatically answer at all.
When disabled, the modem can only answer with an ATA command.
Range: 0—255
Default: 0
Units: rings
S1 Ring Counter
This register, Ring Counter, is read only. The value of S1 is incremented with each ring. If no
rings occur over a six second interval, this register is cleared.
Range: 0—255
Default: 0
Units: rings
S2 AT Escape Character (user defined)
This register determines the ASCII valued used for an escape sequence. The default is the +
character. The escape sequence allows the modem to exit data mode and enter command
mode when on-line. Values greater than 127 disable the escape sequence.
Range: 0—255
Default: 43
Units: ASCII
S3 Command Line Termination Character (user defined)
This register determines the ASCII values as the carriage return character. This character is
used to end command lines and result codes.
Range: 0—127, ASCII decimal
Default: 13 (carriage return)
Units: ASCII
Not
e: This register value is not stored with &W command.
S4 Response Formatting Character (user defined)
This register determines the ASCII value used as the line feed character. The modem uses a
line feed character in command mode when it responds to the computer.
Range: 0—127, ASCII decimal
Default: 10 (line feed)
Units: ASCII
Not
e: This register value is not stored with &W command.
