A4.1.1.4 Application Layer
(See National Preface of EN 60870-5-101.)
Transmission mode for application data
Mode 1 (least significant octet first), as defined in clause 4.10 of IEC 870-5-4, is
used exclusively in this companion standard.
Common Address of ASDU (System-Specific Parameter)
[✓] One octet [✓] Two octets
Information Object Address (System-Specific Parameter)
[✓] One octet [✓] Structured
[✓] Two octets [✓] Unstructured
[✓] Three octets
Cause of Transmission (System-Specific Parameter)
[✓] One octet [✓] Two octets (with originator address)
Selection of Standard ASDUs
Process Information in Monitor Direction (Station-Specific Parameter)
P634 A4 Telecontrol Interfaces
A4-4 P634/EN M/R-42-A // P634‑311‑653
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