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Reference Manual
00809-0100-4811, Rev DA
Appendix C: Rosemount 3300 Series with HART
®
to Modbus
®
Converter
January 2015
Rosemount 3300 Series with HART
®
to Modbus
®
Converter
Figure C-1. System Overview
During normal operation, the HMC “mirrors” the contents of process variables from the 3300
transmitter to the Modbus registers. To configure the 3300 transmitter, it is possible to connect
a configuration tool to the HMC. See “Transmitter configuration” on page 186 for more
information.
C.3 Workflow
Overview of workflow for commissioning a Rosemount 3300 transmitter with Modbus protocol:
1. Mount the transmitter on the tank.
2. Connect the power and communication wires.
3. Establish HART communication with the transmitter through Rosemount Radar
Configuration Tools (RCT), or a Field Communicator. This is done by:
Connecting to the HART terminals, or
Connecting to the MA (+)/MB (-) terminals (tunneling mode)
4. Configure the transmitter.
5. Configure the Modbus communication.
6. Configure Modbus host.
7. Verify output values as reported by the transmitter.
C.4 Mechanical installation
For instructions on how to mount the Rosemount 3300 transmitter, refer to “Mechanical
installation” on page 29.
3300
transmitter
electronics
HART
signals
HART to Modbus
Converter
Modbus and
Levelmaster
communication
Remote
Term inal
Unit
RCT/
Field
Communicator
HART signals
3300 transmitter enclosure
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