Summary
Resources
The NT920HDI converts serial heading data received from different types of proprietary heading transmission sources (electronic compasses including GPS antenna types etc.) to the data type required by various end user brands of radars, trackplotters and heading repeaters etc. including some Navitron autopilot types. In addition, NT920HDI software version 4.0 onward incorporates speed log pulse input facilities which are combined with heading to provide NMEA output data (VHW sentence) for use by ECDIS etc.
The input signal applied to the NT920HDI can be of a single type (NMEA only or Furuno only) and will result in simultaneous output transmissions in the formats shown above.
Alternatively more than one heading input signal type can be simultaneously applied in which case the priority (preferred) input data to be accepted is installation selectable with backup (2nd choice) data immediately available in the event of principal data failure:
| Priority | Data Type | Data Type |
|---|---|---|
| 1 | NMEA 0183 | Furuno |
| 2 | Furuno | NMEA 0183 |
If the priority input data fails, the NT920HDI will automatically select the 2nd source after a period of 5 seconds and will automatically revert to the preferred source as soon as data is restored.
When speed log input data is also available, this will automatically be combined with the heading output data to provide NMEA outputs in the VHW sentence format required by ECDIS etc.
The NMEA and Furuno outputs are not opto isolated and require that the associated receiver units are themselves equipped with opto isolated input stages to avoid common mode problems.
The Step by Step output is installation selectable at 3, 6, 12 or 24 steps/degree (as required) and is logic rated at 5V p.p / 2mA per step line and will in many cases require buffering with a Navitron Step Interface Box type NT925SIB.
The dedicated Navitron output ports provide autopilot heading reference information and custom serial data for use by Navitron Digital Heading Repeaters (type NT920DHR).
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