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Section 10
Appendix 2 IEC 60870-5-104 interoperability
10.1.5
80
Frame length
Maximum length L
(number of octets)
When using an unbalanced link layer, the following ASDU types are returned in
class 2 messages (low priority) with the indicated causes of transmission:
The standard assignment of ASDUs to class 2 messages is used as follows:
Type identification
9, 11, 13, 21
A special assignment of ASDUs to class 2 messages is used as follows:
Type identification
(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 with
"X".)
One octet
Two octets
Structured
Unstructured
Cause of transmission
<1>
Cause of transmission
Two octets
1MRS757105 B
RER601/603
Technical Manual
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