Argus Radar - SERIAL INTERFACE SPECIFICATIONS
988-10187-004 2.40
HBT – Heartbeat supervision sentence
This sentence is intended to be used to indicate that equipment is operating normally, or for
supervision of a connection between two units.
The sentence is transmitted at regular intervals specified in the corresponding equipment
standard. The repeat interval may be used by the receiving unit to set the time-out value for
the connection supervision.
$--HBT,x.x,A,x*hh<cr><lf>
Sequential sentence identifier (see Note 3)
Equipment status (see Note 2)
Configured repeat interval (see Note 1)
NOTE 1
Configured autonomous repeat interval in seconds. This field should be set
to NULL in response to a query if this feature is supported.
NOTE 2
Equipment in normal operation A = yes, V = no
This field can be used can be used to indicate the current equipment status.
This could be the result of an built-in integrity testing function.
NOTE 3
The sequential sentence identifier provides a message identification number
from 0 to 9 that is sequentially assigned and is incremented for each new
sentence. The count resets to 0 after 9 is used.
ACK – Acknowledge alarm
Acknowledge device alarm. This sentence is used to acknowledge an alarm condition
reported by a device.
$--ACK,xxx*hh<CR><LF>
Unique alarm number (identifier) at alarm source
ALR – Set alarm state
Local alarm condition and status. This sentence is used to report an alarm condition on a
device and its current state of acknowledgement.
$--ALR,hhmmss.ss,xxx,A, A,c--c*hh<CR><LF>
Alarm’s description text
Alarm’s acknowledge state, A = acknowledged
V = unacknowledged
Alarm condition (A = threshold exceeded, V = not exceeded)
Unique alarm number (identifier) at alarm source
Time of alarm condition change, UTC
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