
120
Reference Manual
00809-0100-4811, Rev DA
Appendix A: Reference Data
January 2015
Reference Data
Figure A-8. Rosemount 3300 Series Wiring Using a Modbus Converter
External power supply
The input voltage (U
I
) for Modbus is 8 to 30 Vdc.
Power consumption:
< 0.5 W (with HART address = 1)
< 1.2 W (incl. four HART slaves)
For flameproof/explosion-proof installations the Rosemount 3300 Series Transmitters have a
built-in barrier; no external barrier needed.
Figure A-9. External Power Supply for Modbus
Rosemount 3300 Series
Transmitter
Control
system
HART
modem
PC
3300 setup in RCT
via tunneling
Power
Field Communicator
Modbus, Levelmaster
emulation / RS-485
PC
3300 setup in RCT
RS-232 / RS-485
converter
RS-485 bus
U
I
: input voltage
(Vdc)
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