FieldServer A Sierra Monitor Company FS-8700-123 - Manual (Page 15)

FS-8700-123 MetOne Particle Counter Driver Manual Page 15 of 22
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5.12 Map Descriptor Example 9 – An alternate way of storing the current record.
In this example a number of passive Map Descriptors are created to store specifically labeled count records in specific places. These Passive Map Descriptors
are related to the active RDBC Map Descriptor in that they belong to the same device (Node Names are the same and both the active and the passives are
‘Device’) as well as all being ‘Current Record’ Map Descriptors. In addition to the normal storage of the response data the driver examines the label which
precedes each count value and looks for a Map Descriptor whose Met1_Label matches the count label. In this example those labels are “0.1” “0.3” “0.5”
“1.0” “3.0” “5.0” “10.” “FLO” and “LOC”. If there was a count whose label was different from one of these then the driver would not find a matching Map
Descriptor and thus would not perform this additional storage for that count.
Example: If the current record contained this fragment …0.1 000123 LOC 000009 STA 000101 … then the driver would use passive Map Descriptors to store the
value 123 at offset 0 in the Data Array store the value 9 at offset 8 in DA= DA_CURR_D01_LBL and would not perform additional storage of the value 101
because it cannot find a label = “STA” . However all these values would be stored in the Data Array called DA_CURR_01 as described in example 7.
DATETIME is a special label. It is not sent in the message from the counter. When the driver sees this label it stores the date and time stamp extracted from
the record it is processing in 6 consecutive locations in the data array (mm/dd/yy hh:mm:ss). The driver also checks that the value found in the LOC label
matches the device/port number – this is a requirement for storage. For example, When polling a 2100 connected to a multi-port manifold, we always poll
device zero but we use the value found in the LOC label to decide which port was just sampled and hence which set of Map Descriptors to use for storage.
Examples 7, 8 and 9 can be combined and the current record stored in all 3 ways.
Map_Descriptors
Map_Descriptor_Name , Scan_Interval , Data_Array_Name , Data_Array_Offset , Length , DA_Byte_Name , Function , Node_Name , Met1_Function , Met1_SubDev_or_Port
Rd_CurretVals , 0s , DA_CURR_D01 , 0 , 20 , DA_DUMP_D01 , Rdbc , MET1 , Current Record , Device
Map_Descriptors
Map_Descriptor_Name , Scan_Interval , Data_Array_Name , Data_Array_Offset , Length , Function , Node_Name , Met1_Function , Met1_SubDev_or_Port , Met1_Label
Rd_CurretVals1 , 0s , DA_CURR_D01_LBL , 0 , 1 , Passive , MET1 , Current Record , Device , 0.1
Rd_CurretVals2 , 0s , DA_CURR_D01_LBL , 1 , 1 , Passive , MET1 , Current Record , Device , 0.3
Rd_CurretVals3 , 0s , DA_CURR_D01_LBL , 2 , 1 , Passive , MET1 , Current Record , Device , 0.5
Rd_CurretVals4 , 0s , DA_CURR_D01_LBL , 3 , 1 , Passive , MET1 , Current Record , Device , 1.0
Rd_CurretVals5 , 0s , DA_CURR_D01_LBL , 4 , 1 , Passive , MET1 , Current Record , Device , 3.0
Rd_CurretVals6 , 0s , DA_CURR_D01_LBL , 5 , 1 , Passive , MET1 , Current Record , Device , 5.0
Rd_CurretVals7 , 0s , DA_CURR_D01_LBL , 6 , 1 , Passive , MET1 , Current Record , Device , 10.
Rd_CurretVals8 , 0s , DA_CURR_D01_LBL , 7 , 1 , Passive , MET1 , Current Record , Device , FLO
Rd_CurretVals9 , 0s , DA_CURR_D01_LBL , 8 , 1 , Passive , MET1 , Current Record , Device , LOC
Rd_CurretVals9 , 0s , DA_CURR_D01_LBL , 9 , 6 , Passive , MET1 , Current Record , Device , DATETIME