Product data

USRobotics
Command Reference
Syntax and Procedures - 5
Parameters may be "set" (to store a value or values for later use), "read" (to
determine the current value or values stored), or "tested" (to determine whether or
not the equipment implements the parameter, and the ranges of values
supported).
Basic Syntax Commands
Basic Syntax Command Format
The format of Basic Syntax commands, except for the D and S commands, is as
follows:
<command>[<number>]
where <command> is either a single character, or the "&" character followed by a
single character per V.250. In addition, <command> can be the "%" character
followed by a single character, the "*" character followed by a single character, or
the "^" character followed by a single character.
<number> may be a string of one or more characters from "0" through "9"
representing a decimal integer value. Commands that expect a <number> are
noted in the description of the command. If a command expects <number> and it
is missing (<command> is immediately followed in the command line by another
<command> or the termination character), the value "0" is assumed. If a
command does not expect a <number> and a number is present, an ERROR is
generated. All leading "0"s in <number> are ignored by the modem.
Additional commands may follow a command (and associated parameter, if any)
on the same command line without any character required for separation. The
actions of some commands cause the remainder of the command line to be
ignored (e.g., A).
See the D command for details on the format of the information that follows it.
S-Parameters
Commands that begin with the letter "S" are known as "S-parameters". The
number following the "S" indicates the "parameter number" being referenced. If
the number is not recognized as a valid parameter number, an ERROR result
code is issued.
Immediately following this number, either a "?" or "=" character must appear. "?" is
used to read the current value of the indicated S-parameter; "=" is used to set the
S-parameter to a new value.
S<parameter_number>?
S<parameter_number>=[<value>]