Application Layer - ABB Relion RER615 Manual

Section 3
IEC 60870-5-101/104 protocol implementation
3.7
54
Frame length
Maximum length L (control direction)
4095
Maximum length L (monitor direction)
255
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
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
Two octets
Structured
Unstructured
Cause of transmission
Cause of transmission
Recloser Protection and Control RER615
1MRS757824 C
Point List Manual