
188
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
5. In the Modbus Setup window, select Modbus protocol and enter the desired Modbus
address.
6. Enter the baud rate, parity, and stop bits, then select OK.
It is also possible to enter a user-defined Modbus Message in the Modbus String area.
See separate sections below for more details regarding each Modbus protocol.
C.8.2 Using a Field Communicator to change communication
parameters
Note
To change Modbus communication parameters, the Rosemount 3300 Series Transmitter must
use HART address 1, the default address.
Note
After changing communication parameters, disconnect the Field Communicator and wait up to
60 seconds for the change to take effect.
The Modbus communication parameters can be changed by entering a text string in the HART
Message parameter. See separate sections below for details regarding each Modbus protocol
and what strings to use.
When using the Field Communicator, the Message Area is reached using HART command
[1,4,1,6].
C.8.3 Modbus RTU communication setup
The Rosemount 3300 Series is configured with the default Modbus RTU address 246, and with
the following Modbus RTU communication parameter default settings:
Table C-3. Modbus RTU Communication Parameters
To reset the communication parameters to default Modbus RTU settings, use the following
Modbus Message:
HMC
Parameter Default value Configurable values
Baud Rate 9600 1200, 2400, 4800, 9600, 19200
Start Bits
(1)
(1) Start Bits and Data Bits cannot be changed.
One One
Data Bits
(1)
Eight Eight
Parity None None, Odd, Even
Stop Bits One One or Two
Address range 246 1-255
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