Campbell Scientific CR3000 CR3000 Micrologger - Page 369
Alternate Telecommunications
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Section 8. Operation Note Setting the encryption key for a PakBus port device will force all messages it sends to use encryption. 8.6 Alternate Telecommunications The CR3000 communicates with datalogger support software (p. 76) and other Campbell Scientific dataloggers (p. 565) using the PakBus (p. 463) protocol (PakBus Overview (p. 356) ). Modbus, DNP3, and Web API are also supported. CAN bus is supported when using the Campbell Scientific SDM-CAN communications module. 8.6.1 DNP3 8.6.1.1 Overview The CR3000 is DNP3 SCADA compatible. DNP3 is a SCADA protocol primarily used by utilities, power-generation and distribution networks, and the water- and wastewater-treatment industry. Distributed Network Protocol (DNP) is an open protocol used in applications to ensure data integrity using minimal bandwidth. DNP implementation in the CR3000 is DNP3 Level-2 Slave Compliant with some of the operations found in a Level-3 implementation. A standard CR3000 program with DNP instructions will take arrays of real time or processed data and map them to DNP arrays in integer or binary format. The CR3000 responds to any DNP master with the requested data or sends unsolicited responses to a specific DNP master. DNP communications are supported in the CR3000 through the RS-232 port, COM1, COM2, COM3, or COM4, or over TCP, taking advantage of multiple communications options compatible with the CR3000, e.g., RF, cellular phone, satellite. DNP3 state and history are preserved through power and other resets in non-volatile memory. DNP SCADA software enables CR3000 data to move directly into a database or display screens. Applications include monitoring weather near power transmission lines to enhance operational decisions, monitoring and controlling irrigation from a wastewater-treatment plant, controlling remote pumps, measuring river flow, and monitoring air movement and quality at a power plant. 8.6.1.2 Programming for DNP3 CRBasic example Implementation of DNP3 (p. 371) lists CRBasic code to take Iarray() analog data and Barray() binary data (status of control port 5) and map them to DNP arrays. The CR3000 responds to a DNP master with the specified data or sends unsolicited responses to DNP Master 3. 8.6.1.2.1 Declarations Table DNP3 Implementation - Data Types Required to Store Data in Public Tables for Object Groups (p. 370) shows object groups supported by the CR3000 DNP implementation, and the required data types. A complete list of groups and variations is available in CRBasic Editor Help for DNPVariable(). 369