CXR V.34bis series, Operation And Installation Manual

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V.34bis Series Standalone & Rackmount Modems
115
7
S-Registers
S-Register Functions
The S-Registers are used to set the numerous operating parameters of the
modem. There are many parameters of operation that may be varied to
satisfy the many possible data communications applications. Many of these
parameters are stored and remain operative until changed. Some hold data
for a given situation and the data is erased when reset or power is lost.
Use of the bit-mapped registers requires familiarity with the format and logic
involved. If a bit-mapped register is changed in error with the ATSr=n
command, the AT&Fn command will restore all of the registers of the
configuration to factory settings. The values in TABLE 7.1 give the decimal
value <nn>or the hexadecimal code when a "h" is indicated <xxh> for the S-
Registers. When the S-Registers are read by the ATSr? command the
response will be a decimal value. If an S-Register is changed by the
ATSr=n command, the n is a decimal value. On the following pages many
S-Registers are shown in the binary "bits" notation for bit-mapped options.
If the binary bits are converted to their decimal equivalent, this will be the
decimal value shown in response to the ATSr? command. Several S-
Registers have been assigned that are not used, or are reserved, and are
not applicable to these modems. This detail is noted when appropriate.
The two tables that follow provide listings of the S-Registers in numeric
order and then by functional groups. A third table is provided that lists all S-
Registers with further details.