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FS-8700-83 Gamewell Page 8 of 24
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Map Descriptor Example 1 – Store data from incoming messages.
This example illustrates typical map descriptor uses to store data from panel generated messaged.
As all these map descriptors have their Clear_On_Reset field set to yes, when a panel reset message is received all the data in the controlled
arrays will be set to zero When a point reports its own state as normal the driver will set the appropriate element of the appropriate array to zero
to indicate the normal state..
Data is stored, first by finding a map descriptor with the correct circuit number. If the message doesn’t contain a circuit number then it is assumed
to be from the panel itself. If a message contain a CKT number and no DEV number then the driver assumes the device number is zero. The
storage location is based on the device number – it is used as an offset into the array.
Map_Descriptors
Map_Descriptor_Name, Data_Array_Name, Data_Array_Offset, Function, Node_Name, ckt , Dev, Length, Data_Type , Clear_On_Reset
Panel_data , DA_STATUS , 000 , passive , panel1 , Panel, 0 ,100 , Any , Yes
Ckt1_data01 , DA_STATUS , 200 , passive , panel1 , 1 , 0 ,100 , Any , Yes
Ckt2_data01 , DA_STATUS , 400 , passive , panel1 , 2 , 0 ,100 , Any , Yes
Ckt3_data01 , DA_STATUS , 600 , passive , panel1 , 3 , 0 ,100 , Any , Yes
In this example all the
data for all these
circuits is stored in one
array.
The offset is used to
control the location in
the array.
You need one map
descriptor for each
circuit / panel.
These map descriptors
are all passive. We
cannot poll the panel
but we can wait
passively for the panel
to send us messages.
Because the Data Type
is ‘Any’ the driver will
set an array element
non-zero if any
messages indicate that
the point in not in a
normal condition.
The length determines
the number of devices
that can be processed
using the map
descriptor.
Say a message for
Ckt:2 Dev:20 is
received. The driver
looks at the device
number and the length
to see if the range of
devices covers the
incoming message. I
this case the data
would be stored at
offset 20 in the map
descriptor.