3
Protocol for Home/Facility Automation Control
The following tables describe the message packet formats for Arm/Disarm, Zone Status, Output Control, and
System Event Notification messages between the control panel and the Home/Facility Automation software.
Message Packet Format Components
The table below describes the different components of a Message Packet format. A typical message packet
format contains the following components: NNMSD…00 CC (CR-LF)
NOTES: Messages contain printable ASCII characters with the exception of the Terminator (CR-LF).
All hex values are entered in upper case only.
Message Packet Components
Component Symbol Character
Length
Definition
Packet Length NN
2
Indicates the total length of packet including all characters
minus terminator. Legal values are hex 00-FF. Permissible
characters are ASCII 0-9 and upper case A-F.
Message/Packet
Type
M
1
Upper and lower case alpha characters a-z and A-Z. The
commands are case-sensitive and must be entered with the
case shown.
Sub-Message/
Packet Type
S
1
Upper and lower case alpha characters a-z and A-Z. The
commands are case-sensitive and must be entered with the
case shown.
Data D…
0 or more
ASCII characters of data associated with the command/
packet type. Any printable ASCII character is permitted.
Reserved 00
2
Two ASCII characters reserved for future development. Only
current legal character is numeric “0”.
Checksum CC
2
The hexadecimal 2’s complement of the modulo-256 sum of
the ASCII values of all characters in the message excluding
the checksum itself and terminator. Permissible characters
are 0-9 and upper case A-F.
Terminator (CR-LF)
Message Terminator. ASCII characters consisting of
hexadecimal 0x0D and 0x0A.
ARM and DISARM Messages
The PC can be used to ARM and DISARM a control panel partition, or query the panel’s arming status. An
ARM DISARM message packet format contains the following components: 16AMNNUUUUPPPPPPPP00CC (CR-LF).
ARM/DISARM Message Packet Components
Symbol Component Definition
16 Packet Length
Indicates the total length of packet minus terminator.
AM Arming Mode
Indicates the arming mode. AA = Arm Away; AH = Arm Home
(Stay); AI = Arm Instant; AM = Arm maximum; FA = Force Arm
Away; FH = Force Arm Home (Stay); AD = Disarm.
NN User Number
The user number is not needed. Any 2-digit number may be used to fill
this location.
UUUU User Code
4-digit user code.
PPPPPPPP 8 Partitions
The partitions to which the command should be applied. The partitions
may be in any order.
00; CC;
(CR-LF)
Reserved;
Checksum;
Terminator
See Message Packet Format Components
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