Chapter 4 - Data Communications Definitions
© 2017 Siemens Protection Devices Limited Chapter 4 - Page 21 of 96
3.3 Application Service Data Unit (ASDU) Type
The Application Service Data Unit (ASDU) column of the “Information Number and Function” table lists the possible
ASDUs returned for a point.
ASDU # Description
1 Time tagged message (monitor direction)
2
3.1
Time tagged message (relative time) (monitor direction)
Measurands I
4 Time-tagged measurands with relative time
5 Identification message
6 Time synchronisation
7
9
General Interrogation Initialization
Measurands II
20
General command
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