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Why would I want or need
an NMEA 2000 to NMEA 0183 gateway?
There are a number of reasons why adding an Actisense NMEA 2000 to NMEA 0183
gateway can help the user:
1. When the user is considering upgrading their vessel to use an NMEA
2000 bus, but does not want to (or cannot afford to) replace every
NMEA 0183 device with an NMEA 2000 one - especially when NMEA 2000 devices can
be very expensive.
The NGW-1 allows most existing NMEA 0183 equipment to be retained,
as well as allowing new NMEA 2000 equipment to be installed and used.
By connecting the NMEA 0183 equipment to the NMEA 2000 bus via the NGW-1, the
data can be shared in both directions.
2. When certain information is only available on one network bus (NMEA
0183 or NMEA 2000) and the display or use of that data is required on the other
bus.
For example, the user could benefit from knowing the status of the vessels engine,
but only have an NMEA 0183 chartplotter and/or PC.
The NGW-1 allows unique NMEA 2000 data to be shared with the NMEA 0183
bus, and the NMEA 0183 chartplotter and/or PC.
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How many NMEA 0183 devices
can be connected to the NGW-1's ISO-Drive out?
Whilst the NGW-1's output is capable of driving up to
8 NMEA 0183 instruments, to maintain the galvanic isolation between each of
the NMEA devices, it is recommended to connect only one NMEA device.
If all the NMEA 0183 devices connected to the NMEA output are proven to
have a correct NMEA 0183 opto-isolated input, then it is possible to connect
the NGW-1 output to multiple NMEA devices and still
maintain galvanic isolation. However, this is the only condition where
multiple NMEA 0183 devices is recommended. |
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When connecting multiple NMEA devices, the exact number possible will depend
on the total cable length, cable quality, and instrument inputs. Longer total
cable lengths, poor cable resistance and capacitance, and device inputs not
meeting the NMEA 0183 specifications (stipulating a maximum 2 mA drain) will
reduce the maximum number of devices drivable.
If bi-directional communications are required, then naturally only one NMEA
0183 device can be connected to the NGW-1.
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