Telecontrol equipment and systems - Part 5: Transmission protocols; section 1: Transmission frame formats (IEC 60870-5-1:1990); German version EN 60870-5-1:1993— 39 стр.
Industrial communication networks - Fieldbus specifications - Part 4-7: Data-link layer protocol specification - Type 7 elements (IEC 61158-4-7:2007); English version EN 61158-4-7:2008, only on CD-ROM— 122 стр.
High-level data link control procedures, HDLC; CCITT X.25 LAPB-compatible data link procedures for data terminal equipment; identical with ISO 7776:1986 (status as of 1989)— 31 стр.
High-level data link control procedures, HDLC; address resolution/negotiation in asynchronous balanced mode over switched circuit; identical with ISO 8471:1987— 9 стр.