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Appendix C: HART Communication Protocol
Connection to HART Protocol (3-Wire)
Note: For providing of correct work of HART interface, a 250 Ohm resistor is required. In the case of low resistance of the controller
4-20 mA, the resistor can be installed in the controller input instead of IR3 output.
1. To power the IR3, connect the power cable from the 18-32 VDC power supply to X4 terminal (+24V & COM)
2. The common ground cable shall then connect to one side of the Field communicator terminal
3. Connect a cable to X3 terminal (+4/20) that is in series with a 250 Ohm resistor. This cable shall then connect to another side of
the Field communicator terminal
4. Power up the IR3 and Field communicator.
5. Follow the HART menu tree to navigate to the corresponding function.
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