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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.