transmissionGroupNumber

Syntax: CHOICE { integer INTEGER, uninitialized NULL }
Meaning: This attribute provides the TG number associated with the connection provided by this logicalLink. If the TG number is unknown, (uninitialized NULL) is provided.
Source: The TG number may be predefined with the TGN operand of the PU statement in system definition or may be dynamically assigned if not predefined. Not all PUs represented as logicalLinks will have TG numbers (for example, PU T1). PUs or link stations with the TG defined as ANY, where the TG number has not been negotiated, will return uninitialized NULL.
Operations: GET
Attribute of: logicalLink