Campbell Scientific CR3000 Micrologger - Manual (Page 369)

Section 8. Operation
369
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().