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Manual Supplement
00809-0500-4530, Rev AA
October 2010
Rosemount 5300/5400 Series
1-14
MODBUS
COMMUNICATION
PROTOCOL
CONFIGURATION
The Rosemount 5300/5400 level 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 1-3. List of RTUs’ 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.
Using RRM 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 HART modem and
wait at least 60 seconds for the change to take effect.
In case the MA/MB terminals are used for connection to the HMC, disconnect
the RS-485 Converter, cycle power to the transmitter and wait up to 60
seconds for the change to take effect.
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