Comtrol AT Command Set Rev A - Manual (Page 19)

AT Commands Reference Manual
100722B Conexant 2-5
String Constants
String constants consist of a sequence of displayable IA5 characters, each in the range
from 2/0 to 7/15, inclusive, except for the characters ‘"’ (IA5 2/2) and "\" (IA5 5/12).
String constants are bounded at the beginning and end by the double-quote character (‘"’,
IA5 2/2).
Any character value may be included in the string by representing it as a backslash ("\")
character followed by two hexadecimal digits. For example, "\0D" is a string consisting
of the single character <CR> (IA5 0/13). If the "\" character itself is to be represented in a
string, it is encoded as "\5C". The double-quote character, used as the beginning and
ending string delimiter, is represented within a string constant as "\22".
A "null" string constant, or a string constant of zero length, is represented by two
adjacent delimiters ("").
Compound Values
Actions may have more than one subparameter associated with them, and parameters
may have more than one value. These are known as "compound values", and their
treatment is the same in both actions and parameters.
A compound value consists of any combination of numeric and string values (as defined
in the description of the action or parameter). The comma character must be included as a
separator, before the second and all subsequent values in the compound value. If a value
is not specified (i.e., defaults assumed), the required comma separator must be specified;
however, trailing comma characters may be omitted if all associated values are also
omitted.
2.4.3 Action Commands
Action Execution Command Syntax
There are two general types of action commands: those that have associated subparameter
values that affect only that invocation of the command, and those that have no
subparameters.
If subparameters are associated with a command, the definition of the action command
indicates, for each subparameter, whether the specification of a value for that
subparameter is mandatory or optional. For optional subparameters, the definition
indicates the assumed (default) value for the subparameter if no value is specified for that
subparameter; the assumed value may be either a previous value (i.e., the value of an
omitted subparameter remains the same as the previous invocation of the same command,
or is determined by a separate parameter or other mechanism), or a fixed value (e.g., the
value of an omitted subparameter is assumed to be zero). Generally, the default value for
numeric subparameters is 0, and the default value for string subparameters is "" (empty
string).
The following syntax is used for actions that have no subparameters:
+<name>