DMI Troubleshooting

Confirming that a DMI is setup and communicating properly within the entire system is important. Once all the hardware is setup, and the necessary commands have been issued, use the following checklist to ensure that the DMI information is being created and used:

  • RAWDMI logs are being published by the receiver.

  • RAWDMI logs have valid data (when in motion the value in the RAWDMI log will increase).

  • DMISTATUS in the INSUPDATESTATUS log reports a status greater than or equal to ACTIVE.

If there are no valid RAWDMI logs being published from the receiver then debugging the hardware connections and setup commands may be required. Check the following:

  • All communication lines are connected to the DMI.

  • The DMI is being powered.

  • The receiver is being powered.

  • The DMI has been enabled through a DMICONFIG command.

  • The receiver has the latest NovAtel Firmware, available from the NovAtel website (novatel.com/support/support-materials/firmware-download).

  • The receiver has a valid SPAN model for use with DMI.

Further electrical troubleshooting may be required to verify signal integrity. In many cases, note the following.

  • Cable shields should be tied to the connector shells and the metallized backshells/housings should be in contact with the connector shells as well.

  • A +/- and B +/- differential pairs should be on twisted pairs in the cables.

DMI input is not supported on Legacy CPT7 receivers (PN 80023560).