Emerson 5400, 5300 specifications Modbus Communication Protocol Configuration

Rosemount 5300/5400 Series

Manual Supplement

00809-0500-4530, Rev AA October 2010

MODBUS

COMMUNICATION

PROTOCOL

CONFIGURATION

Table 1-3. List of RTUs’ Supported Protocols

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).

RTU	Protocols
ABB Totalflow	Modbus RTU, Levelmaster
Bristol ControlWave Micro	Modbus RTU
Emerson Process	Modbus RTU, Levelmaster(1)
Management ROC800 Series
Emerson Process	Modbus RTU, Levelmaster(1)
Management FloBoss 107
Kimray DACC 2000/3000	Levelmaster
ScadaPack	Modbus RTU
Thermo Electron Autopilot	Modbus RTU, Levelmaster

Using RRM to change communication parameters

(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.

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.

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.

1-14