Campbell Scientific CR800 and CR850 Measurement and Control Systems - Manual (Page 349)

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)