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
Specifies the requirements for standard interfaces between the alarm system transceivers and transmission network where both form part of a dedicated channel alarm transmission system as defined in IEC 60839-5-4.
Life cycle
NOW
WITHDRAWN IEC 60839-7-12:2001 ED1 95.99
Withdrawal of Standard Oct 14, 2022