Nexus 21 NX2 - Manual (Page 14)

SERVER
Note!
A Laptop PC may have a GPS PCMCIA card installed and deliver position and time
data. However, if the same data is coming in on port A where position have a higher
priority, that data will be used prior to the data from the PC.
This three-port combination proposal will add several advantages. The NX2 GPS
navigator instrument has its own NMEA port where any GPS may be connected.
Navigation can be made from that instrument or it can be used as a repeater, showing
data from the Laptop PC or from a GPS placed at the navigation table below deck. The
GPS instrument can be used as the primary navigator, the backup or as repeater only.
2. Position, speed and course is received from the Silva NX2 GPS antenna or from
any GPS receiver. The Nexus GPS Navigator instrument may navigate by use of
the internal 400 way-point memory or repeat data from either the Laptop PC or
from a GPS/plotter. Whenever there is a need to get use of three NMEA input
ports, this is the recommended way. Additional NMEA compass, wind-transducer
or depth-sounder transmitting NMEA can then be added.
Note!
NMEA transducers may degrade the NX2 system performance and accuracy. For
highest performance only use NX2 transducers.
2.7 Connecting a NMEA instrument IN to the Server
Products transmitting NMEA, for example:
GPS, Decca, Loran, NMEA compass and wind transducer etc.
If a NMEA instrument is connected, most information will be available and can be
displayed on the Nexus Network.
You must know which 2 cables from your other NMEA instrument carry the NMEA out
signal. If you have trouble call the dealer you bought your NMEA instrument from. He
should know the wiring colour and will probably sell the ”plug set” which may be
required. We do not have this information.
Connect NMEA out signal from the NMEA instrument to Server pin 10 (INPUT A).
Connect NMEA return signal from the NMEA instrument to Server pin 11 (INPUT B).
(For list of NMEA receive sentences, see 2.10.3).
Note a: The Server allows only one NMEA instrument connected to the input pins 10
and 11.
Note b: We do not recommend the use of NMEA transducers like wind and compass,
because the update rate of data is slow compared to the very fast Nexus data bus.
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