Signal Class Users Guide

# 3. Usage and Limitations

The signal class is foreseen to be used encapsulated in a device server class. Signal objects cannot be exported on the network and cannot be accessed via commands. Signal objects should be created with ds__create() and should be accessed via the ds__method_finder().

The resource database has only four fields to store the signal resources. Using the point as a separator between the signal name and the resource name limits the length of a signal name to 23 characters.

The maximum length of a resource to be stored as a string in the database is dependant on the database used and on the space reserved for a database table. The minimum size of 24 characters for a string, is fixed by most of the resource tables of the RTDB implementation. In this case a signal label cannot exceed this limit and a description must be split into a string array with strings not exceeding 24 characters.

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