Campbell Scientific CR6 CR6 Measurement and Control System - Page 411
CRBasic Instructions DNP3, 6.2.2.3 Programming for DNP3 Data Acquisition
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Section 8. Operation 8.6.2.2.2 CRBasic Instructions (DNP3) Complete descriptions and options of commands are available in CRBasic Editor Help. DNP() Sets the CR6 as a DNP slave (outstation/server) with an address and DNP3dedicated COM port. Normally resides between BeginProg and Scan(), so it is executed only once. Example at CRBasic example Implementation of DNP3 (p. 412), line 20. Syntax DNP(ComPort, BaudRate, DNPSlaveAddr) DNPVariable() Associates a particular variable array with a DNP object group. When the master polls the CR6, it returns all the variables specified along with their specific groups. Also used to set up event data, which is sent to the master whenever the value in the variable changes. Example at CRBasic example Implementation of DNP3 (p. 412), line 24. Syntax DNPVariable(Source, Swath, DNPObject, DNPVariation, DNPClass, DNPFlag, DNPEvent, DNPNumEvents) DNPUpdate() Determines when DNP slave (outstation/server) will update its arrays of DNP elements. Specifies the address of the DNP master to which are sent unsolicited responses (event data). Must be included once within a Scan() / NextScan for the DNP slave to update its arrays. Typically placed in a program after the elements in the array are updated. The CR6 will respond to any DNP master regardless of its address. Syntax DNPUpdate (DNPSlaveAddr,DNPMasterAddr) 8.6.2.2.3 Programming for DNP3 Data Acquisition As shown in CRBasic example Implementation of DNP3 (p. 412), program the CR6 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) 411
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