4.3 Network configuration
(Network-specific parameter, all configurations that are used are to be marked with
“X”.)
Point-to-point Multipoint-party line
Multiple point-to-point Multipoint-star
4.4 Link layer
(Network-specific parameter, mark all used options with an “X“. Specify the
maximum frame length. If a non-standard assignment of class 2 messages is
implemented for unbalanced transmission, indicate the Type ID and COT of all
messages assigned to class 2.)
Frame format FT 1.2, single character 1 and the fixed time-out interval are used
exclusively in this companion standard.
Link transmission procedure
Address field of the link
Balanced transmission Not present (balanced transmission
only)
Unbalanced transmission One octet
Two octets
Structured
Unstructured
Frame length
Maximum length L (control direction)
Maximum length L (monitor direction)
Time during which repetitions are permitted (Trp) or number of repetitions
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 Cause of transmission
A special assignment of ASDUs to class 2 messages is used as follows:
IEC 60870-5-104 interoperability 2NGA001859 A
36 REX615
IEC 60870-5-104 Communication Protocol Manual
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