Configuring GNSS - DMU801

DMU801 Time Synchronization Management Guide
Product status
Document code
M213266EN
Revision
B
ft:locale
en-US
Product
DMU801
Document type
User guide
To enable GNSS‑based time synchronization, DMU801 requires the NMEA RMC message. This message includes UTC time, date, and position data, which are essential for setting the system clock.

When time synchronization is handled with GNSS signals, the system uses discrete steps for initial time synchronization and then adjusts the clock rate to maintain accuracy.

The GNSS component provides measurements such as latitude, longitude, altitude, heading, speed, and climb rate.

  1. Connect a GNSS receiver (for example, Garmin) to DMU801 through a serial port.

    Preferably, use the DMU801 base unit ports X2 or X3. This helps avoid bus congestion, especially when the GPS is sending large amounts of data.

  2. Make sure that the receiver is placed with a clear line of sight to the sky for optimal satellite signal reception.
  3. Log in to the Web UI and go to Settings > Date and time.
  4. Under Date and time source, select External time source and GNSS/NMEA.
  5. To save the changes, select Save.
  6. In Kaiku Designer, add the GNSS receiver to the application with the gnss_device component.
  7. Upload the application to DMU801.