
204
Reference Manual
00809-0100-4811, Rev DA
Appendix C: Rosemount 3300 Series with HART
®
to Modbus
®
Converter
January 2015
Rosemount 3300 Series with HART
®
to Modbus
®
Converter
C.12 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 3300 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 3300 transmitter may need a terminating 120-resistor connected between
MA (+) and MB (-)
No 3300 communication in RCT
Using HART+, HART-
HART modem is not properly connected
Polling address is incorrect in RCT (default 1)
Using MA (+), MB (-)
See No communication on RS-485 bus
Polling address is incorrect in RCT (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” on page 186 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” on page 186 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” on page 186 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
Komentáře k této Příručce