Every Information Object contains:
- The Information Object Address (IOA) that is 1, 2 or 3 bytes long.
- A set of Information Elements or a sequence of information element sets. The type of information elements in the
set and their order depend on the ASDU's TypeId and is the same for all information objects within one ASDU. If the
sequence bit is set in the ASDU then the ASDU contains a single Information Object containing a sequence of
information element sets. If the sequence bit is not set the ASDU contains a sequence of information objects each
containing only single information elements sets.