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5.3.4.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).
| 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, |
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| Desired Mode, | , |
| ON | , |
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| OFF | , |
| TABLE DISPLAY, | 01, |
| 1 | ||||||||
| Display_MD02, |
| passive, |
| Node_1, |
| DISPLAY, |
| ALARM | , |
| Equipment |
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| ALARM | , |
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| NORMAL, |
| TABLE DISPLAY, |
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| 02, |
| 1 | |
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| Status, |
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| Display_MD03, | passive, | Node_1, | DISPLAY, | CSPT | , |
| Controlling Setp, |
| dF, |
| NUMERIC, |
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| TABLE DISPLAY, | 03, |
| 1 | |||||||||||
| Display_MD04, | passive, | Node_1, | DISPLAY, | SPT | , |
| Controlling Temp, |
| dF, |
| NUMERIC, |
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| TABLE DISPLAY, | 04, |
| 1 | |||||||||||
| Display_MD05, | passive, | Node_1, | DISPLAY, | RAT | , |
| Space Temp, |
| dF, |
| NUMERIC, |
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| TABLE DISPLAY, | 05, |
| 1 | |||||||||||
| Display_MD06, | passive, | Node_1, | DISPLAY, | SAT | , |
| Supply Air Temp, |
| dF, |
| NUMERIC, |
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| TABLE DISPLAY, | 06, |
| 1 | |||||||||||
| Display_MD07, | passive, | Node_1, | DISPLAY, | FANSTAT, | Fan Mode, | , |
| ON | , |
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| OFF, |
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| TABLE DISPLAY, | 07, |
| 1 | ||||||||||
| Display_MD08, | passive, | Node_1, | DISPLAY, | CCAP | , |
| Cooling Capacity, | % | , | NUMERIC, |
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| 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 | , |
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| CLEAN, | TABLE DISPLAY, | 10, |
| 1 | ||||||||||||
All the server Map | If the value of the array named |
Descriptors are | TABLE_DISPLAY, offset 10 is 1 |
passive. | 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.
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