A4.1.1.3 Link Layer (Network-Specific Parameters)
(See National Preface of EN 60870-5-101.)
Frame format FT 1.2, single character 1, and the fixed time-out interval are used
exclusively in this companion standard.
Link Transmission Procedure
[✓] Balanced transmission
[✓] Unbalanced transmission
Address Field of the Link
[✓] Not present (balanced transmission only)
[✓] One octet
[✓] Two octets (balanced transmission only)
[✓] Structured
[✓] Unstructured
Frame Length
[240] Maximum length L (number of octets)
A4 Telecontrol Interfaces
P631
P631/EN M/R-11-C // P631-310-650 A4-3
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