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Manual Supplement
00809-0500-4530, Rev AA
October 2010
Rosemount 5300/5400 Series
1-16
Using a Field
Communicator to change
communication
parameters
NOTE
To change Modbus communication parameters, the Rosemount 5300/5400
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 [2,2,1], and then selecting Message (menu item 11 for
Rosemount 5300 and menu item 10 for Rosemount 5400).
Modbus RTU
Communication Setup
The Rosemount 5300/5400 is configured with the default Modbus RTU
address 246, and with the following Modbus RTU communication parameter
default settings:
Table 1-4. Modbus RTU
Communication Parameters
To reset the communication parameters to default Modbus RTU settings, use
the following Modbus Message:
HMC
Modbus RTU Parameter Configuration Example
You want to use address 44 for the 5300/5400 transmitter, and the following
communication parameters are used by the host:
Table 1-5. Communication
Parameters Used by the Host
(example)
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
Parameter Value
Baud Rate 4800
Start Bits One
Data Bits Eight
Parity Odd
Stop Bits Two