Longshine LCS-8056C2 - Manual (Page 15)

Commands for Host-Processed Modems Reference Manual
100498E 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>
The following syntax is used for actions that have one subparameter:
+<name>[=<value>]
The following syntax is used for actions that have two or more subparameters:
+<name>[=<compound_value>]
For actions that accept subparameters, if all subparameters are defined as being optional, and
the default values for all subparameters are satisfactory, the data terminal equipment (DTE)
may use the first syntax above (i.e., omit the "=" from the action execution command as well
as all of the subparameter value string).