Each event in Contact ID is sent as a string of 16 DTMF digits. For example, an alarm followed by a restore and then an opening would be 3 events. All Contact ID strings follow the format:
CCCC 18 SXYZ GG PPP K
where:
CCCC
4 digit client code that identifies the panel or site.
18
Always the digits "18".
SXYZ
Event code.
S = Status. 1 - Alarm or Opening. 3 - Restore or Closing. (Note: Alarm Restores only reported on Area Opening)
GG
Group Byte which signifies the Area being Opened/Closed or the Area in which the alarm occurred.
PPP
Point ID. This refers to either the Point number or the User ID depending on the type of event.
K
Checksum.
Some receivers display a "U" (User) or a "C" (Alarm Point) in front of the PPP, depending on which of these PPP represents.
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