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Determining the Communications Protocol of a 3710 ACM Meter


  • A 3710 ACM meter with an ISOCOM card has one communications protocol available: either PML or Modbus. The protocol is configured in the meter’s firmware. Use the meter’s front panel to determine which protocol the meter uses. You cannot change the protocol using the 3710 ACM meter’s front panel.

    Note that a 3720 ACM meter with an ISOCOM2 card has both the PML and Modbus protocols available. Switching between protocols is done from the 3720 ACM meter’s front panel.


    3710 communications Modbus PML ISOCOM


    In order to determine which protocol was installed on your 3710 ACM meter's ISOCOM communications card, you must check the firmware using the meter’s front panel:

    1) Hold down the 'Parameter Select' and 'Cursor' buttons together until the display reads 'Programming Mode'.
    2) Press 'Parameter Select' until you get to 'Diagnostics', then press 'Increment'. 'Yes' appears on the display.
    3) Press 'Parameter Select' again to display the meter’s firmware version.

    If there is an 'M' in the firmware version, then the meter is communicating with the Modbus protocol.

    If there is no 'M', then the meter is communicating with the PML protocol.

Original article#11548

Last Revised: 2008-Jan-08


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