Reading and Writing

Retrieves a variable in the Item field on a device. This name must be in the format described next.

<(type_specification)>variable_name<[access_index]><.member_name<[member_index]>>

The format of the Item field obeys the following restrictions:

•The variable_name and member_name elements must contain only alphanumeric ASCII characters without symbols, except for the underscore character

•The access_index and member_index elements must be positive integers greater than 0 (zero)

•Elements inside less than (<) and greater than (>) characters are optional

•When the type_specification element is available, this variable is a structure

•The type_specification element must contain data types separated by commas and optionally followed by their array sizes