APPENDIX D: IEC 60870-5-104 PROTOCOL D.6 IEC 60870-5-104 INTEROPERABILITY
GEK-106310-AF F650 DIGITAL BAY CONTROLLER d-13
When using an unbalanced link layer, the following ASDU types are returned in class 2 messages (low priority)
with the indicated causes of transmission:
Note: (In response to a class 2 poll, a controlled station may respond with class 1 data when there is no class
2 data available).
Application layer
Transmission mode for application data
Mode 1 (Least significant octet first), as defined in 4.10 of IEC 60870-5-4, is used exclusively in this companion
standard.
Common address of ASDU
(system-specific parameter, all configurations that are used are to be marked "X")
Link transmission
Address field of the link
Frame length
Type identification Cause of transmission
9, 11, 13, 21 <1>
Type identification Cause of transmission
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