Reading Ademco Contact ID
Contact ID is the alarm format defined in SIA DC-05. Each event is 16 digits: account, message type 18, qualifier, event code, partition, zone or user, checksum.
Event codes are grouped by hundreds: 1xx alarms, 3xx troubles, 4xx open/close, 5xx bypasses, 6xx tests and system events.
SIA DC-03 is a different format that uses two-letter codes. The lookup table on this page covers the common ones.
FAQ
What does a Contact ID message look like?ACCT MT Q EEE GG ZZZ S: a 4-digit account, message type 18, a qualifier, a 3-digit event code, a 2-digit partition, a 3-digit zone or user, and a checksum digit.
What do qualifiers 1, 3 and 6 mean?1 is a new event or opening, 3 is a restore or closing, and 6 is a previously reported condition that is still present.
How is the Contact ID checksum calculated?Add every digit, counting 0 as 10. The checksum digit makes the total a multiple of 15. A checksum of 15 is sent as F.
Is ZZZ a zone or a user?Zone for alarms and troubles, user number for open/close events such as 401.
What is SIA DC-03?SIA DC-03 is the SIA format, which sends 2-letter event codes such as BA (burglary alarm) and OP (opening) instead of 3-digit Contact ID codes.