
208
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
Note
An error message might be displayed when performing the Reset to Factory Settings operation.
The operation has been successful if the checksum error has been cleared.
d. Select Tools > Restart Device.
e. Select Tools > Diagnostics, and then select Device Errors to verify that the
“Checksum” error is no longer present. If it is still present, follow the steps f to j.
f. Select Service > View Holding Registers.
g. Select Numbers.
h. In the Start Register box, type 65510, and then select Read.
i. Type the value 16760 to register 65510 and select Store.
j. Select Tools > Restart Device.
11. If the HMC is configured for Modbus ASCII or Levelmaster communication after upload
has been completed, proceed with the following:
a. Close RRM and disconnect the RS-485 converter from the HMC.
b. Cycle the power to the HMC to have it exit Modbus RTU communication mode.
C.14 Specifications
Table C-25. Specifications
Power supply 8-30 Vdc (max. rating)
Power consumption
< 0.5 W (with HART address=1)
< 1.2 W (incl. four HART slaves)
Signal wiring
Two-wire half duplex RS-485 Modbus. Use shielded twisted pair wiring,
preferably with an impedance of 120(typically 24 AWG), in order to
comply with EIA-485 standard and EMC regulations.
Power supply cabling
The power supply cables must be suitable for the supply voltage and
ambient temperature, and approved for use in hazardous areas, where
applicable.
Ground (common mode)
voltage limit
± 7 V
Bus termination Standard RS-485 bus termination per EIA-485
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