Connect to a wired HART interface


Unless the CSI 9420 is purchased pre-configured from the factory, you must connect it to a wired HART interface. This is to define device credentials that allow the device to communicate on your wireless network. You can also define other device configurations such as sensor type and alert thresholds at this time.

  • Use the wired HART interface only for configuration. Dynamic variables (such as measured vibration parameters) are not updated when communicating on the wired interface.
  • The CSI 9420 does not communicate simultaneously on both the wired and wireless HART interfaces. You will lose wireless connectivity when you connect to the wired HART interface. Configuration changes are not reflected in a wireless host until connection has been re-established. To avoid loss of synchronization, disconnect hosts relying on the wireless link when communicating with the device on the wired interface.

    For example, if you are viewing a configuration screen in AMS Device Manager through a wireless link, and you leave this screen open while making changes with a Field Communicator, you will have to exit AMS Device Manager and then re-open it (or re-scan the device) after the wireless connection has been restored in order to see the changes.


  1. Remove the transmitter back cover.
    This exposes the terminal block and HART communication terminals.

    Figure 1. CSI 9420 terminal block with two-wire, polarity-independent connection

    1. COMM terminals (power module version)
    2. HART COMM terminals (externally powered version)
  2. Connect the power module or supply power using an external power source.

    Figure 2. Field Communicator and power module connection

  3. Configure using a Field Communicator, AMS Device Manager, or any HART-enabled host.
    Press Send to send configuration changes to the transmitter.
    The CSI 9420 enters “HART Listen” mode for communication on the wired interface. HART Listen is displayed on the optional LCD, if it is installed.

    If the device is unable to enter the HART Listen mode during its boot sequence or while performing its real-time vibration measurement, retry the initial wired HART handshaking sequence.

    If repeated attempts to establish wired communication fail, you can force the device into a HART Listen mode by removing the transmitter front cover and pressing the CONFIG button once. Once the device enters HART Listen mode, it remains in this mode until you press the CONFIG button, the power cycles, or no activity is seen on the wired interface for three minutes. Pressing the CONFIG button a second time causes the device to exit HART Listen mode.

    The front electronics end cap (the cap covering the LCD) is certified for Class I, Division I in appropriate gas environments (check the nameplate on the device for details).

    Exposing the electronics to a production environment can allow particulates, moisture, and other airborne chemicals to enter into the device, which could lead to contamination and potential product performance issues. In all cases, whenever opening the front end cap, be sure to seal it completely afterwards by tightening until the black O-ring is no longer visible. For an illustration on how to properly seal the end cap, see Figure 2.

  4. When configuration is complete over the wired HART interface, disconnect the transmitter from the communication wires to re-establish wireless communication.
    This may take several minutes.