( = application service data unit,
"rakendusteenuse andmeüksus")

olemus
andmeside protokollielement:
energeetika kaugjuhtimisstandardis IEC 60870,
muutpikkusega edastuskaader
=
application layer message
submitted to lower layers for transmission,
using the IEC 60870-5 protocol

ülevaateid
https://infosys.beckhoff.com/index.php?content=../content/1031/tf6500_tc3_iec60870_5_10x/984444939.html&id=

https://en.wikipedia.org/wiki/IEC_60870-5