No 5300/5400 communication in RRM

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

•Using HART+, HART-

•HART modem is not properly connected

•Polling address is incorrect in RRM (default 1)

•Using MA, MB

•Polling address is incorrect in RRM (default 1)

•Cycle the power and wait 20 seconds before polling

•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

•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

•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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