Campbell CR850, Operator'S Manual, Page: 349 / 566

Section 8. Operation
349
Syntax
DNPUpdate (DNPSlaveAddr,DNPMasterAddr)
8.6.1.2.3 Programming for Data-Acquisition
As shown in CRBasic example Implementation of DNP3
(p. 349),
program the
CR800 to return data when polled by the DNP3 master using the following three
actions:
1. Place DNP() at the beginning of the program between BeginProg and Scan() .
Set COM port, baud rate, and DNP3 address.
2. Setup the variables to be sent to the master using DNPVariable() . Dual
instructions cover static (current values) and event (previous ten records) data.
o
For analog measurements:
DNPVariable ( Variable_Name,Swath,30,2,0,&B00000000,0,0)
DNPVariable ( Variable_Name,Swath,32,2,3,&B00000000,0,10)
o
For digital measurements (control ports):
DNPVariable ( Variable_Name,Swath,1,2,0,&B00000000,0,0)
DNPVariable ( Variable_Name,Swath,32,2,3,&B00000000,0,10)
3. Place DNPUpdate() after Scan() , inside the main scan. The DNP3 master is
notified of any change in data each time DNPUpdate() runs; e.g., for a 10
second scan, the master is notified every 10 seconds.
CRBasic Example 65. Implementation of DNP3
Public IArray(4) As Long
Public BArray(2) As Boolean
Public WindSpd
Public WindDir
Public Batt_Volt
Public PTemp_C
Units WindSpd=meter/Sec
Units WindDir=Degrees
Units Batt_Volt=Volts
Units PTemp_C=Deg C
'Main Program
BeginProg
'DNP communication over the RS-232 port at 115.2kbps. Datalogger
'DNP address is 1
DNP (COMRS-232,115200,1)
'DNPVariable(Source, Swath, DNPObject, DNPVariation, DNPClass, DNPFlag,
'DNPEvent, DNPNumEvents)
DNPVariable (IArray,4,30,2,0,&B00000000,0,0)