ATEIS DIVA8G2 - Manual (Page 269)

System Functionality 269
© 2012 ATEÏS
No parity.
Low-level Data Protocol
Transmission from Fire Panel to Voice Alarm System
o Start character ”>” 0x3E
o Identifier character “I” 0x49
o Body of message Sequence of printable characters
o End character 1 “CR” 0x0D
o End character 2 “LF” 0x0A
Transmission from Voice Alarm System to Fire Panel
o Start character “>” 0x3E
o Identifier character “I” 0x49
o Body of message Sequence of printable characters
o End character “CR” 0x0D
The maximum message length (including start and end characters) is 128 characters.
Full-duplex mode
Transmission from Fire Panel to Voice Alarm System
o No echo is expected, because of the checksum.
o A checksum is included in the message, just before the end characters.
Transmission from Voice Alarm System to Fire Panel
o Each character sent, including start and end characters, is echoed by the panel.
o No checksum is expected, because of the echo.
Checksum
The checksum is the sum of ASCII codes for all the characters in the message from the identifier
character “I”, up to the character immediately preceding the first checksum character, inclusive.
Cyclical communication Voice Alarm System sends the following message to Fire Panel each 30
seconds. The Fire Panel answers with the Panel Status Message. The bit 2 FAULT is checked by
the Voice Alarm System to display the message FIRE PANEL FAULT.
Request VAS “>” “I” “V” “M” “02” “CR”
Response FP “>” “I” “V” “S” “PN1” “SW4” “02” “CS2” “CR” “LF”
With
PN1 Panel Number 1 character (value 0)
SW4 Status Word 4 characters
CS2 Checksum 2 characters