SourceTag and data output to other systems

For data output to other systems, the SourceTag is the PI tag of the data source. For example, you can define a tag ABC to receive data using point source A, and then define another tag DEF to send this information to another instrument system using point source B. The source tag for tag DEF would be ABC. This attribute is used by some interfaces, while other interfaces use the extended descriptor (ExDesc) for this information.

The interface performs the reading and writing of data when this attribute is defined.

The SourceTag attribute is not stored in the Point Database. It is only a more readable representation of the srcptid attribute that holds the source point ID. srcptid does not exist in all point classes. For example, it is part of the classic point class but not of base.

Note: SourceTag is used for output tags, which are completely dependent on the interface for how they should be configured to work. See the interface documentation for details.