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values that the modem uses for other purposes. If S3 and S5 are set to the same value,
a matching character will be treated as matching S3 (S3 is checked before S5).
2.2.3 Command Line Echo
The modem may echo characters received from the DTE during command state and
online command state back to the DTE, depending on the setting of the E command. If
so enabled, characters received from the DTE are echoed in the same format as
received. Invalid characters in the command line or incomplete or improperly-formed
command line prefixes may not be echoed.
2.2.4 Repeating a Command Line
If the prefix "A/" or "a/" is received, the modem immediately executes once again the
body of the preceding command line.
No editing is possible, and no termination character is necessary. A command line may
be repeated multiple times in this manner. Responses to the repeated command line are
issued using format of the original command line. If "A/" is received before any command
line has been executed, the preceding command line is assumed to have been empty
(that results in an OK result code).
2.2.5 Types of DTE Commands
There are two types of commands: action commands and parameter commands.
Commands of either type may be included in command lines, in any order.
Action commands may be "executed" (to invoke a particular function of the equipment,
which generally involves more than the simple storage of a value for later use), or
"tested" (to determine whether or not the equipment implements the action command,
and, if subparameters are associated with the action, the ranges of subparameter values
that are supported).
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).
2.3 Basic Syntax Commands
2.3.1 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.25 ter. 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.
2.3.2 S-Parameters
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