Emerson 5400, 5300 specifications Troubleshooting No communication on RS-485 bus MA, MB

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Rosemount 5300/5400 Series

Manual Supplement

00809-0500-4530, Rev AA October 2010

TROUBLESHOOTING No communication on RS-485 bus (MA, MB)

Check that the cables are connected

Check that PWR+ is connected to + and PWR- is connected to - on the power supply

Make sure the 5300/5400 transmitter is supplied with 8-30 Vdc (max. rating)

Try alternating MA/MB if you are unsure of the polarity

If an RS-485 converter is used, make sure it is properly installed and configured

The last 5300/5400 transmitter may need a terminating 120-Ω resistor connected between MA and MB

No 5300/5400 communication in RRM

Using HART+, HART-

HART modem is not properly connected

Polling address is incorrect in RRM (default 1)

Using MA, MB

See No communication on RS-485 bus

Polling address is incorrect in RRM (default 1)

Cycle the power and wait 20 seconds before polling

No communication with Modbus RTU protocol

See No communication on RS-485 bus

Make sure the “Modbus Communication Protocol Configuration” is done properly

Make sure the Modbus RTU address is unique on the bus

Cycle the power and try to connect

Check the RTU communication settings

No communication with Modbus ASCII protocol

See No communication on RS-485 bus

Make sure the “Modbus Communication Protocol Configuration” is done properly

Make sure the Modbus ASCII address is unique on the bus

Cycle the power, waiting 40 seconds before communication begins

Check the RTU communication settings

No communication with Levelmaster protocol

See No communication on RS-485 bus

Make sure the “Modbus Communication Protocol Configuration” is done properly

Make sure the Levelmaster address is unique on the bus

Cycle the power, waiting 40 seconds before communication begins

Check the RTU communication settings

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Contents Rosemount 5300/5400 Series with Hart to Modbus Converter Manual SupplementSafety Messages Explosions could result in death or serious injuryIntroduction WorkflowMechanical Installation Electrical Installation Field Wiring Connections Hart + Installation cases RS-485 BusStar Topology Alternative Multidrop Connection of 5300/5400 TransmittersNo. of devices Approx. update rate Slaves External Hart Devices SlavesEstablish Hart Communication Connect to the MA/MB terminalsRosemount 5300/5400 Series Connect to the Hart terminals Transmitter Configuration Modbus Communication Protocol Configuration Using RRM to change communication parametersModbus Setup Modbus RTU Parameter Configuration Example HMC A44 B4800 PO S2 Levelmaster Communication SetupHMC A127 Levelmaster Parameter Configuration Example HMC M2 A2 B9600 D7 PN S1Implemented Functions of Levelmaster Protocol Modbus Ascii Communication Setup HMC M1 A246 B9600 D7 PN S1Rosemount 5300/5400 Series Alarm Handling Levelmaster Modbus RTUModbus Ascii Rosemount 5300/5400 Series Common Modbus Host Configuration Input RegistersBit information in bitfield 14. Output Variables for Floating Point Format Code Rosemount 5300/5400 Series Volume Length Measurement UnitsSpecific Modbus Host Configuration Emerson Process Management ROC800 SeriesEmerson Process Management FloBoss ABB TotalFlowThermo Electron Autopilot Bristol ControlWave MicroScadaPack Kimray Dacc 2000/3000No communication with Modbus RTU protocol Troubleshooting No communication on RS-485 bus MA, MBNo 5300/5400 communication in RRM No communication with Modbus Ascii protocolHMC Firmware Upgrade in Rosemount Radar Master Select Enable Modbus Communication and click OKRosemount 5300/5400 Series Click Browse Checksum Rosemount 5300/5400 Series Specifications Rosemount 5300/5400 Series Emerson Process Management Rosemount Measurement