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User’s Guide and Reference 4 - 37
Modem Command Reference
Register Descriptions
S0 — Number of Rings Till Auto-Answer
Range 0-255 rings
Default 0
Establishes the number of rings required before the modem answers the
incoming calls. Setting this register to zero disables auto-answer mode.
S1 — Ring Counter
Range 0-255 rings
Default 0
Number of rings which the modem detects before it answers a call. If no
rings occur over an eight second interval, the register is cleared.
S2 — Escape Character
Range 0-255, ASCII decimal
Default 43
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.
S3 — Carriage Return Character
Range 0-127, ASCII decimal
Default 13 (Carriage Return)
Sets the command line and result code terminator character. Pertains to
asynchronous operation only.
S4 — Line Feed Character
Range 0-127, ASCII decimal
Default 10 (Line Feed)
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.