input is set to alarm mode by ”alr” command. The message is transmitted immediately after change of port status
(out of regular broadcasting period) and contains only information relevant to the port, on which the status was
changed. The message has four data segments:
The first data segment
carries alarm category information. Its DIF/VIF values are always set to is set either
to ”02” and ”7A” (storage 0, 16-bit Integer, unspecified content). Common meaning of ”7A” value (unspecified
content) within WB169 product range is always
”
Alarm Category/Type”
. Data value of the first segment is
always ”0” (all alarms supported by the module are of ”Generic” category).
The second data segment
carries alarm type information. Its DIF/VIF values are always set to is set either to
”42” and ”7A” (storage 1, 16-bit Integer, unspecified content). Data value of the second segment means number of
alarm type, that is for this type of message either ”5” (if the sensor turned from normal to alarm status = rising of
alarm), or ”4” (transition from alarm to normal status = end of alarm).
The third data segment
carries information about the status of sensor input after change of status, so its value
is either ”0”, or ”1”. Decoding information DIF/VIF are set as follows:
DIF = 31 for 1. input (average value, 8-bit integer, storage ”0”)
DIF = 71 for 2. input (average value, 8-bit integer, storage ”1”)
VIFE = FD 3A for all inputs (dimensionless value ”NO VIF”)
The fourth data segment
carries information about the current status of sensor input counter (i.e. number of
transitions since last counter reset). The DIF and VIF values correspond with setting of given input, transferred
data value (Value) is counter current status.
Decoded alarm message about the change of sensor status on the first input is shown in the figure
: Alarm message
Figure 15: Structure of alarm message about the change of sensor status on the port of WB169-SI2 module
about a
module reset
is transmitted after each module switching on and after each module reset. The message has
three data segments, the obligatory
”
alarm category” and
”
alarm type” segments are followed by segment with reset
code. Decoded alarm message about the module reset with ”4” (
”
Power Reset”) reset code is shown in the figure
Alarm messages of
”
LEAK” and
”
BURST” functions
are transmitted immediately after the alarm status is
Figure 16: Structure of alarm message about the reset of WB169-SI2 module
detected on some input (see description of
”
Leak” function in paragraph
and description of
”
Burst” function
in paragraph
). Messages of ”NO LEAK”/”NO BURST” type are generated in that case, when ”non-alarm”
period comes after one or several ”alarm” periods.
The messages have three segments, the first two segments with alarm category and alarm type (15, 16, 17, or 18)
are followed by segment with current status of affected port counter. Decoded alarm message about the rising of
”
Leak” alarm on the first input (index 1) at the counter status 261 m3 is shown in the figure
Figure 17: Structure of WB169-SI2 module alarm message about the
”
Leak” type of alarm
WB169-SI2
31
