Black Box 32144, Руководство пользователя

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CHAPTER 5: Hayes Emulation Mode
\S—VIEW STATUS OF V.42-
RELATED CONFIGURATION.
The \S command displays the active
V.42 error correction
configuration, stored V.42 profiles,
and certain other data not
displayed by the &V command.
5.5 Registers
The modem includes 28 registers
(S0-S27) that can be used to
control specific modem operations
in Hayes mode only. Each register
holds a value that serves as a
specific operating instruction for
the modem. Several of the S
registers affect how the previously
described commands will be
executed.
The functions of the registers
intended for user access are
explained below and summarized
in
Table 5-3 .
5.5.1 R
EADING AND
S
ETTING
R
EGISTERS
Use the S command to read the
value of a register or to change its
value.
To read the current value of a
register, use the command S?,
where the number of the register is
specified between the S and the ?,
as follows: S9?. The decimal value
of the register contents will then be
displayed. Multiple registers may be
read. For example, if you wish to
read the current value in registers
S0 and S7, enter
AT S0? S7?
A typical response might be
001,030, OK, meaning that the
values stored in registers S0 and S7
are 1 and 30, respectively.
To set or change a parameter, use
the command S=, where the
number of the register follows S
and a value between 0 and 255 (the
range of values that can be assigned
to the registers) follows the equal
sign:
AT S0=5
This command will change the
value stored in S0 to 5.
The S command can also be used
without ? or = to point to a register
that will be subsequently read from
or written to without being
specified. To illustrate this, if you
enter
AT S7
a pointer is set to the address of
register S7. As long as no other S
command is entered, the register
value can be requested at any time
without specifying the number. If
you enter AT? the modem displays
the current value in the S7 register.
Similarly, if you enter AT=8 the
modem will change the value in
the S7 register to 8.