FieldServer A Sierra Monitor Company FS-8700-123 - Manual (Page 10)

FS-8700-123 MetOne Particle Counter Driver Manual Page 10 of 22
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5.4 Map Descriptor Example 1 – Read Hold ( or Sample) Times from a Device .
(Important Note: See Appendix B.3
In this example the driver reads the hold time from the field device. To read Sample Times simply change the Met1_Function to ‘Sample Time.
//, , , , 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.
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.
Reserves 3 Data
array locations
for storing data.