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4.4.5.Map Descriptor Example #2 – Read Status
In this example a Map Descriptor is defined which controls the task of reading status data from the Setra Model 370 Digital Pressure Gage. The task gets performed every 5.0 seconds. When a response is received the data is stored in the Data Array called DA_STATUS stating at element zero (the offset). Each pressure status reading requires the driver store 20 parameters and hence the length of the Map Descriptor is 20. Refer to Appendix A for further information.
Map_Descriptor_Name, | Data_Array_Name, | Data_Array_Offset, | Function, | Node_Name, | Gage_Function, | Length, | Scan_Interval |
Read_Status, | DA_STATUS, | 0, | RDBC, | Gage1, | Status , | 20, | 5.0s |
Unique names |
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assist config file | The name of a | The 1st location | ||||
validation |
| Data Array in | in | the | Data | |
debugging | but | which | the | Array which will | ||
are | not | response | data | be | used | for |
necessary. |
| will be stored. | storage. |
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The name of a Node defined in the CSV file. The node name connect the MD to a node which in turn points to a connection Thus the driver knows what port and port settings to use to send the poll..
Tells the driver to read the current status from the Gage
Reserves 20 elements of the Data Array to store response data.
Tells the driver to schedule this MD no more often than 5 seconds.
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