Hardware manual

5901 High Speed Dialup Modem Hardware Manual
October 19, 2007
73
11 Modem S-Registers
The modem S-Registers are summarized below along with their default values; registers denoted
with an '*' may be stored in one of the two user profiles by entering the &Wn command. One of
these profiles may be loaded at any time by using the Zn command. Registers or register fields
quoted as “reserved” are reserved for current or future use by the firmware, or are permanently
overridden by PTT limitations.
All bit-mapped registers are read-only. The appropriate AT command which controls the relevant
bits in the S-Register should be used to change the value.
The factory default values are stored in ROM and are loaded into the active configuration at power
up or by the ATZn command. In addition, the designated default profile is subsequently loaded, and
may change some of the factory default values. The designated default profile can be changed by
entering the &Yn command where n is one of the two possible user profiles.
The defaults shown are those used by the modem in factory profiles zero and one. The factory
default values may be loaded at any time by entering the &Fn command.
11.1 S0 - Number of Rings to Auto-Answer
Sets the number of the rings required before the modem automatically answers a call. Setting this
register to zero disables auto-answer mode.
Range: 0-255 rings
Default: 0
11.2 S1 - Ring Counter
S1 is incremented each time the modem detects a ring signal on the telephone line. S1 is cleared if
no rings occur over an eight second interval.
Range: 0-255 rings
Default: 0
11.3 S2 - Escape Character
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, ASCII decimal
Default: 43 (+)
11.4 S3 - Carriage Return Character
Sets the command line and result code terminator character. Pertains to asynchronous operation
only.
Range: 0-127, ASCII decimal
Default: 13 (Carriage Return)