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Reference Manual
00809-0100-4808, Rev CA
June 2008
A-5
Rosemount 3051N
CONNECTIONS AND
HARDWARE
The HART Communicator can interface with a transmitter from the control
room, the instrument site, or any wiring termination point in the loop through
the communicator connections as shown in Figure A-2 and Figure A-3. To
communicate, connect the HART Communicator in parallel with the
instrument or load resistor. The connections are non-polarized. Before
connecting the HART Communicator in an explosive atmosphere, make sure
the instruments in the loop are installed in accordance with intrinsically safe or
nonincendive field wiring practices.
NOTE
The HART Communicator needs a minimum of 250 ohms resistance in the
loop to function properly. The HART Communicator is not a measurement
device and does not need to be calibrated; it is a communications device
through which you can read and adjust the transmitter configuration
information. All variable outputs displayed by the communicator are functions
of the transmitter.
FIGURE A-2. Rosemount 275
Rear Connection Panel with
Optional NiCad Recharger
Pack.
NOTE
Do not make connections to the serial port or NiCad recharger jack in an
explosive atmosphere.
FIGURE A-3. Rosemount 375
HART terminal access door.
See “Safety Messages” on page A-1 for warning information.
Loop Connection Ports
Serial Port
NiCad
recharger
jack
HART Terminal Markings
IrDA interface
(for PC communication)