Chapter 4 - 7SR105 Rho · Data Communications Definitions
© 2018 Siemens Protection Devices Chapter 4 - Page 13 of 70
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 Time tagged message (relative time) (monitor direction)
3.1 Measurands I
4 Time-tagged measurands with relative time
5 Identification message
6 Time synchronisation
7 General Interrogation Initialization
9 Measurands II
20 General command