140
Micro Motion
®
Model 2200S Transmitters
Using the 375 Field Communicator
E.3
Connecting to a transmitter
You can connect the Communicator to the transmitter’s HART clips or to a point on a HART network.
Note: The HART clips on the face of the transmitter are connected to the transmitter’s mA/HART
terminals. You may connect directly to the mA/HART terminals if you have removed the user interface
module.
Note: If you are using the mA/HART terminals to report a process variable and also for HART
communications, see the transmitter installation manual for wiring diagrams.
E.3.1
Connecting to HART clips
To connect the Communicator to the transmitter’s HART clips:
1. Remove the user interface cover (see Section C.3).
2. Connect the Communicator leads to the HART clips on the face of the transmitter. The
connection is polarity-insensitive. See Figure E-1.
3. The Communicator must be connected across a resistance of 250–600
Ω
. Add resistance to
the connection. See Figure E-1.
Figure E-1
Connecting to HART clips
Communicator
250–600
Ω
resistance
HART clips
Connection is
polarity-insensitive
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