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5.4.4. Map Descriptor Example.
This example shows a number of server Map Descriptors used to define a table called ‘DISPLAY’. If a Client sends a read table request the driver
responds by sending all the appropriate data for every Map Descriptor with the same table name (provided that the node’s match too. ). The fields
are returned in the order in which you define them in the configuration file.
// Server Side Map Descriptors
Map Descriptors
Map_Descriptor_Name, Function, Node_Name, Table_Name, Field_Name, Field_Description, Field_Units, On_String, Off_String, Data_Array_Name, Data_Array_Offset,
Length,
Display_MD01, passive, Node_1, DISPLAY, MODE , Desired Mode , , ON , OFF , TABLE_DISPLAY, 01 , 1,
Display_MD02 , passive, Node_1, DISPLAY, ALARM , Equipment Status, , ALARM , NORMAL, TABLE_DISPLAY, 02 , 1,
Display_MD03 , passive, Node_1, DISPLAY, CSPT , Controlling Setp., dF , NUMERIC , -, TABLE_DISPLAY, 03 , 1,
Display_MD04 , passive, Node_1, DISPLAY, SPT , Controlling Temp, dF , NUMERIC, -, TABLE_DISPLAY, 04, 1,
Display_MD05 , passive, Node_1, DISPLAY, RAT , Space Temp, dF , NUMERIC , -, TABLE_DISPLAY, 05, 1,
Display_MD06 , passive, Node_1, DISPLAY, SAT , Supply Air Temp., dF , NUMERIC, -, TABLE_DISPLAY, 06, 1,
Display_MD07 , passive, Node_1, DISPLAY, FANSTAT, Fan Mode, , ON, OFF , TABLE_DISPLAY, 07, 1,
Display_MD08 , passive, Node_1, DISPLAY, CCAP , Cooling Capacity, % , NUMERIC, - , TABLE_DISPLAY, 08, 1,
Display_MD09 , passive, Node_1, DISPLAY, HCAP , Heating Capacity, % , NUMERIC, - , TABLE_DISPLAY, 09, 1,
Display_MD10 , passive, Node_1, DISPLAY, FLTSTAT, Filter Status, , DIRTY, CLEAN , TABLE_DISPLAY, 10, 1,
All the Server Map
Descriptors are
passive.
If the value of the array named
TABLE_DISPLAY, offset 10 is a 1
then the FieldServer will report he
FLTSTAT variable as DIRTY. If it
is zero then the variable’s state will
be reported as clean.
By using the NUMERIC keyword,
the driver is told to report the value
of the variable HCAP as a number.
Thus the driver sends the value of
the array named TABLE_DISPLAY
offset 9 to the Client.