T1200
MARINEC-P-A
3 02/14
PAGE 32 of 67
10.2.9 COMMS FAULT Sentence Structure
This sentence indicates to the VDR that the VDROB has lost communication with the panel.
The comms fault sentence is sent out instead of the standard status message every 10 seconds, until comms is
restored. The hourly status messages are not sent while the comms fault is present.
This sentence takes the following form:
$ttfff,hhmmss.ss,aa,bb,dd,eee,f,g,c—c*hh<CR><LF>
$ – start of sentence
tt – Talker Identifier = FR (Fire detection system)
fff – Sentence Formatter = ALA (Set Detail Alarm Condition)
, – Field Separator
hhmmss.ss – Time of event = Leave Blank (VDROB has no clock)
aa – System indicator of alarm source = FR (Fire Detection System)
bb – Sub-system indicator of fire detection = OT (Others)
dd – Number of equipment = 01 (this is a quantity value)
eee – Number of Alarm Source = 901 (User Defined – General)
f – Alarm Condition = N (Normal) or H (Fault)
g – Alarm’s Acknowledge State = B (Broadcast, no acknowledgement required)
c—c – Alarm’s description text = Alarm description e.g. Communication Failed
* – Indicates next two characters are the checksum
hh – Checksum (XOR of all bytes including commas but excluding $ and *)
<CR> – Carriage Return character = HEX 0D
<LF> – Line Feed character = HEX 0A
A loss of comms with panel 1 would generate the following sentence (every 10 seconds):
$FRALA,,FR,OT,01,901,H,B,PANEL 01 Communication Failed*70<CR><LF>
The HEX data is:
24 46 52 41 4C 41 2C 2C 46 52 2C 4F 54 2C 30 31 2C 39 30 31 2C 48 2C 42 2C 50
41 4E 45 4C 20 30 31 20 43 6F 6D 6D 75 6E 69 63 61 74 69 6F 6E 20 46 61 69 6C
65 64 2A 37 30 0D 0A
Restored comms from panel 1 would generate the following sentence:
$FRALA,,FR,OT,01,901,N,B,PANEL 01 Communication Restored*79<CR><LF>
The HEX data is:
24 46 52 41 4C 41 2C 2C 46 52 2C 4F 54 2C 30 31 2C 39 30 31 2C 4E 2C 42 2C 50
41 4E 45 4C 20 30 31 20 43 6F 6D 6D 75 6E 69 63 61 74 69 6F 6E 20 52 65 73 74
6F 72 65 64 2A 37 39 0D 0A
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