Manual Supplement
00809-0500-4530, Rev AA
October 2010
Rosemount 5300/5400 Series
1-34
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-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
