
186
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
page 179. Note that the power supply must be connected during configuration, see also
“Electrical installation” on page 180.
Note
Measurement data is not updated to the Modbus Master when a configuration tool is
connected.
C.7 Transmitter configuration
Configuration data, such as Tank Height, Upper Null Zone, dielectric constants, and other basic
parameters, are configured in the same way as for a standard Rosemount 3300 Series
Transmitter. For more information, see the Rosemount 3300 Series Quick Start Guide
(document number 00825-0100-4811).
Make sure that the measurement unit of the Primary Variable (PV) matches the configuration of
the Modbus Host since the transmitter output value does not include any information on
associated measurement units.
For further information on basic configuration, see Section 4: Basic Configuration/Start-Up.
Note
The Rosemount 3300 Series Transmitter with Modbus protocol is configured to HART address 1
at factory. This reduces power consumption by locking the analog output at 4 mA.
C.8 Modbus communication protocol configuration
The Rosemount 3300 Series Transmitter can communicate with RTUs using Modbus RTU (often
referred to as just “Modbus”), Modbus ASCII, and Levelmaster (also known as “ROS,” “Siemens,”
or “Tank” protocol).
Table C-2. List of RTU Supported Protocols
Modbus ASCII is not commonly used, since it doubles the amount of bytes for the same
message as the Modbus RTU.
If you do not have any of these RTUs, check your RTU manual to see which protocols it supports.
RTU Protocols
ABB Totalflow Modbus RTU, Levelmaster
Bristol
™
ControlWave
™
Micro Modbus RTU
Emerson Process Management ROC800 Series Modbus RTU, Levelmaster
(1)
(1) Levelmaster protocol should be used when using the Emerson Process Management Digital Level Sensor (DLS) User Program
or Application Module together with the device. Use Modbus RTU in other cases.
Emerson Process Management FloBoss
™
107 Modbus RTU, Levelmaster
(1)
Kimray DACC 2000/3000 Levelmaster
ScadaPack Modbus RTU
Thermo Electron Autopilot Modbus RTU, Levelmaster
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