Verify that the loop wires are connected as shown in the wiring diagrams in thetransmitter installation manual.If your HART network is more complex than the wiring diagrams in the transmitterinstallation manual, contact either Micro Motion or the HART CommunicationFoundation.2. Disconnect the primary mA output wiring from the transmitter.3. Install a 250–1000 Ω resistor across the transmitter’s primary mA output terminals.4. Check the voltage drop across the resistor (4–20 mA = 1–5 VDC).If voltage drop is less than 1 VDC, add resistance to achieve a voltage drop of greaterthan 1 VDC.5. Connect a Field Communicator directly across the resistor and attempt tocommunicate (poll).If communication with the transmitter cannot be established, the transmitter mayneed service. Contact Micro Motion.
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