Campbell CR800 Series, Operator'S Manual

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Section 5. Overview
78
• Peer-to-peer communication — no PC required. Special CRBasic
instructions simplify transferring data between dataloggers for
distributed decision making or control.
• Data consolidation — other PakBus dataloggers can be used as sensors
to consolidate all data into one Campbell Scientific datalogger.
•
Routing — the CR800 can act as a router, passing on messages intended
for another Campbell Scientific datalogger. PakBus supports automatic
route detection and selection.
•
Short distance networks — with no extra hardware, a CR800 can talk to
another CR800 over distances up to 30 feet by connecting transmit,
receive and ground wires between the dataloggers.
In a PakBus network, each datalogger is set to a unique address. The default
PakBus address in most devices is 1 . To communicate with the CR800, the
datalogger support software must know the CR800 PakBus address. The PakBus
address is changed using the
CR1000KD Keyboard/Display
(p. 443),
DevConfig
utility
(p. 103),
CR800 Status table
(p. 527),
or PakBus Graph
(p. 508)
software.
5.3.5 Alternate Comms Protocols — Overview
Related Topics:
•
Alternate Comms Protocols — Overview
(p. 78)
• Alternate Comms Protocols — Details
(p. 428)
Other comms protocols are also included:
• Web API
(p. 435,
p. 435)
•
Modbus
(p. 78)
• DNP3
(p. 79)
Refer to Specifications
(p. 91)
for a complete list of supported protocols. See Data
Retrieval and Comms Peripherals — Lists
(p. 568)
for devices available from
Campbell Scientific.
Keyboard displays also communicate with the CR800. See Keyboard/Display —
Overview
(p. 80)
for more information.
5.3.5.1 Modbus — Overview
Related Topics:
• Modbus — Overview
(p. 78)
•
Modbus — Details
(p. 436)
The CR800 supports Modbus master and Modbus slave communications for
inclusion in Modbus SCADA networks. Modbus is a widely used SCADA
communication protocol that facilitates exchange of information and data between