Section 5. Overview
83
Other comms protocols are also included:
•
Web API
(p. 475,
•
Modbus
(p. 83)
•
DNP3
(p. 83)
Refer to Specifications
(p. 95)
for a complete list of supported protocols. See Data
Retrieval and Comms Peripherals — Lists
(p. 610)
for devices available from
Campbell Scientific.
Keyboard displays also communicate with the CR3000. See Keyboard/Display
— Overview
(p. 84)
for more information.
5.3.6.1 Modbus — Overview
Related Topics:
• Modbus — Overview
(p. 83)
• Modbus — Details
(p. 476)
The CR3000 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
computers / HMI software, instruments (RTUs) and Modbus-compatible sensors.
The CR3000 communicates with Modbus over RS-232, (with a RS-232 to RS-
485 such as an MD485 adapter), and TCP.
Modbus systems consist of a master (PC), RTU / PLC slaves, field instruments
(sensors), and the communication-network hardware. The communication port,
baud rate, data bits, stop bits, and parity are set in the Modbus driver of the master
and / or the slaves. The CR3000 supports RTU and ASCII communication modes
on RS-232 and RS485 connections. It exclusively uses the TCP mode on IP
connections.
Field instruments can be queried by the CR3000. Because Modbus has a set
command structure, programming the CR3000 to get data from field instruments
is much simpler than from serial sensors. Because Modbus uses a common bus
and addresses each node, field instruments are effectively multiplexed to a
CR3000 without additional hardware.
5.3.6.2 DNP3 — Overview
Related Topics:
• DNP3 — Overview
(p. 83)
• DNP3 — Details
(p. 475)
The CR3000 supports DNP3 slave communications for inclusion in DNP3
SCADA networks.
Summary of Contents for CR3000 Micrologger
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