McQuay Micro Tech Open Protocol Driver Manual | Page 10 of 35 |
4.4.4.Map Descriptor Example 1 – Read Everything.
In this example the Map Descriptor tells the driver to read all data fields known for the Node. The data fields are read sequentially and the value obtained placed in the Data Array at a location determined by the driver. Appendix A.2 outlines the data read and the Data Array location of each field. There is no way of telling this command to read some fields more often than others. Each field is read in turn and when the end of the list is reached the driver starts at the beginning again.
Map_Descriptor_Name | ,Data_Array_Name | ,Data_Array_Offset | ,Function | ,Node_Name | ,Length | ,Scan_Interval | ,Field_Name | ,Device_Scaling |
Read Chiller 1 | ,DA_CHILLER1 | ,0 | ,Rdbc | ,Chiller1 | ,1 | ,1.0s | ,Everything | ,Yes |
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This parameter does not affect the functionality of the driver, however, many validation or error messages report the name of the Map Descriptor in the message and, thus it is strongly recommended that unique names be used.
Each field read has its value stored in this Data Array. The location is dependent on the field name. Ensure that the length of the Data Array is at least 200, so that all parameters can be stored.
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| The values will be | |
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| scaled before | |
This parameter | The driver will | storage. | |
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connects the Map | read every data | Example: The | |
Descriptor to a | field known for the | ||
‘Evaporator | |||
node which in turn | device. | ||
Refrigerant | |||
connects the Map |
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| Pressure’ will be | ||
Descriptor to a |
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| stored by dividing | ||
port. |
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| the raw value read | ||
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| by 10. |
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