Emerson manual Connections And Hardware, Rosemount 3051N, Reference Manual

Reference Manual

00809-0100-4808, Rev CA June 2008

Rosemount 3051N

CONNECTIONS AND HARDWARE

FIGURE A-2. Rosemount 275 Rear Connection Panel with Optional NiCad Recharger Pack.

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-2and 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.

Loop Connection Ports

Serial Port

NiCad recharger jack

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.

IrDA interface	HART Terminal Markings
(for PC communication)

See “Safety Messages” on page A-1for warning information.

A-5