User Guide

FS-8700-123 MetOne Particle Counter Serial Driver Manual Page 10 of 26
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4.5. Map Descriptor Example 1 – Read Hold ( or Sample) Times from a Device.
In this example the driver reads the hold time from the field device. The time is stored in 3 consecutive Data Array elements. To read Sample Times simply change the Met1_Function to ‘Sample Time. The driver extracts the time from the response and stores the hours at the specified offset, the minutes in the next Data Array location and the seconds in the 3
rd
location.
// Client Side Map Descriptors Map_Descriptors Map_Descriptor_Name, Data_Array_Name, Data_Array_Offset, Function, Node_Name Met1_Function, Length, Scan_Interval Read_Time, DA_TIMES, 0, RDBC, MET1, Hold Time , 3, 5.0s
While not mandatory, giving each Map Descriptor a unique name will help to diagnose configuration problems.
The name of the Node. The driver uses this name to link the Map Descriptor to a Node Descriptor (where it finds the Device Number specified with the Node_ID parameter). The Node Descriptor provides a link to the connection.
Tells the driver to read the Hold Time from the
field device.
Reserves 3 Data array locations for storing data.
This task must be executed every 5 seconds.
When a response is received the driver extracts the data and stores it in the Data Array named here starting at the location specified by the offset parameter.
Tells the driver to Read continuously.