Dnp3 Communications; Pakbus Communications - Campbell CR300 Series Product Manual

15.4 DNP3 communications

DNP3 is designed to optimize transmission of data and control commands from a master
computer to one or more remote devices or outstations. The data logger allows DNP3
communications on all available communications ports. CRBasic DNP3 instructions include:
DNP()
l
DNPUpdate()
l
DNPVariable()
l
See the CRBasic Editor help for detailed instruction information and program examples:
https://help.campbellsci.com/crbasic/cr300/.
DNPUpdate()
When
DNP3 masters are supported.
For additional information on DNP3 see:
DNP3 with Campbell Scientific Dataloggers
l
Getting to Know DNP3
l
How to Access Your Measurement Data Using DNP3
l

15.5 PakBus communications

PakBus is a Campbell Scientific communications protocol. By using signed data packets, PakBus
increases the number of communication and networking options available to the data logger.
The data logger allows PakBus communications on all available communications ports. For
additional information, see
Advantages of PakBus include:
Simultaneous communications between the data logger and other devices.
l
Peer-to-peer communications - no computer required. Special CRBasic instructions simplify
l
transferring data between data loggers for distributed decision making or control.
Data consolidation - other PakBus data loggers can be used as "sensors" to consolidate all
l
data into one data logger.
Routing - the data logger can act as a router, passing on messages intended for another
l
Campbell Scientific data logger. PakBus supports automatic route detection and selection.
Short distance networks - a data logger can talk to another data logger over distances up
l
to 30 feet by connecting transmit, receive, and ground wires between the data loggers.
In a PakBus network, each data logger is assigned a unique address. The default PakBus address
in most devices is 1. To communicate with the data logger, the data logger support software must
is used to set up the data logger as a remote (slave) device, up to three
The Many Possibilities of PakBus Networking blog article.
15. Communications protocols 97