Lightware MODEX-F15-OPTS-TX User Manual page 50

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7. LW3 Programmers' Reference
Following example presents the structure of the tree traversal:
n-/ node1
node2
Tree
node3
structure
7.1.1.2. Property
The 'property' in the LW3 protocol is basically a leaf, which has a well-defined value.
▪ A property has a value.
A property cannot have child nodes or child properties. It is always a leaf.
▪
▪ A node can have any number of properties (may not have any).
▪ A property is referenced with a dot ('.') after the node name.
The properties' name can contain the elements of the English alphabet, numbers and underscore ('_')
▪
character.
▪ By convention, properties are beginning with a capital letter, all other characters are lowercase ones.
In the case of compound words, all words are beginning with a capital letter (CamelCase).
The value of the property can contain any readable ASCII character.
▪
▪ A property can be read-only or read/write.
Format: pX●/[nodeName].[propertyName]=[propertyValue]
Legend:
p: property
'X' can be:
'r': if the property is read-only.
'w': if the property is readable, writable.
'm': the manual of the property.
'E': error message for the property.
'v': virtual node property: contains a node path to a node which will
be linked to the property's parent node.
Path of the nodes:
n- /node1
node11
n- /node1/node11
node12
n- /node1/node12
n- /node2
n- /node2/node21
node21
n- /node2/node21/
node211
node211
n- /node3
of the nodes
MODEX-F15-OPTS, MODEX-F15-OPTM series – User's Manual
Example:
The following two ones are read-only properties:
pr●/node1/node12.ReadOnlyProperty=value1
pr●/.DeviceName=25G Hybrid Device
The following two ones are read-write properties:
pw●/node1/node12.ReadWriteProperty=value2
pw●/.DeviceNickName=John
7.1.1.3. Method
The 'method' in the LW3 protocol is also a leaf. It cannot have a value, such as the properties, but it can be
invoked with a parameter with the help of a special 'CALL' command.
▪ A method cannot have child nodes or child methods. It is always a leaf.
A node can have any number of methods (may not have any).
▪
▪ A method is referenced with a colon (':') after the node.
▪ The methods' name can contain the elements of the English alphabet, numbers and underscore ('_')
character.
▪ By convention, methods are beginning with lowercase letter. In case of compound words, the very first
letter is lowercase, and the first letter of each other words are capitalized (lowerCamelCase).
The parameter of the method can contain any readable ASCII character.
▪
The method always has a return 'state' if the method could be executed. The state could be either 'OK'
▪
or 'FAILED'.
▪ The method does not necessarily have a return 'value'. If it does, it can contain additional information,
which is always specific to the current case (the return value can specify why the execution failed).
▪ When the method cannot be executed (e.g. the parameter list is illegal), there is an error message.
Format: mX●/[nodeName]:[methodName]=[returnValue]
Legend:
m: method
'X' can be:
'O': when the execution of the method was successful (OK).
'F': when the execution of the method failed.
'm': the manual of the method.
'E': error message for the method.
Example:
mO●/node1/node12:method1
mO●/MEDIA/VIDEO/XP:switch
mE●%E001:Syntax error
mm●/MEDIA/VIDEO/XP:lockSource:Lock one or more source ports
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