IEC 60839-7-12-2001 Alarm systems - Part 7-12: Message formats and protocols for serial data interfaces in alarm transmission systems - PTT interfaces for dedicated communications channels using ITU-T Recommendation V.23 signalling

IEC 60839-7-11-2001 Alarm systems - Part 7-11: Message formats and protocols for serial data interfaces in alarm transmission systems - Serial protocol for use by digital communicator systems using ITU-T Recommandation V.23 signalling at interfaces with t IEC 60839-7-1-2001 Alarm systems - Part 7-1: Message formats and protocols for serial data interfaces in alarm transmission systems - General IEC 60839-5-6-1991 Alarm systems - Part 5: Requirements for alarm transmission systems - Section 6: Requirements for voice communicator systems using the public switched telephone network IEC 60839-7-2-2001 Alarm systems - Part 7-2: Message formats and protocols for serial data interfaces in alarm transmission systems - Common application layer protocol IEC 60839-7-20-2001 Alarm systems - Part 7-20: Message formats and protocols for serial data interfaces in alarm transmission systems - Terminal interfaces employing ITU-T Recommendation V.24/V.28 signalling IEC 60839-7-3-2001 Alarm systems - Part 7-3: Message formats and protocols for serial data interfaces in alarm transmission systems - Common data link layer protocol