NMEA 2000 to PC Interface - NGT-1
Page 9
© 2015 Active Research Limited
NMEA 2000 Networks
NMEA 2000 devices will only communicate with each
other when connected to a powered and correctly
terminated NMEA 2000 network. It is not enough to simply
connect two NMEA 2000 devices directly together.
All networks need to be powered and terminated correctly
to allow data to be transmitted reliably on the network.
T-Pieces are needed to connect each device to the
network. Additional cable lengths can be used between
any of the connectors to extend the length of the network.
Ensure the NMEA 2000 rules for cable length are adhered
to, see
“Table 1 - NMEA 2000 Cable Length Rules”.
Table 1 - NMEA 2000 Cable Length Rules
Cable Type
Max
Length
Per drop cable
6m
Sum of all drop cables
72m
Micro Backbone (terminator to terminator)
100m
Mini Backbone (terminator to terminator)
200m
NMEA 2000 Minimum Network
Requirements
All NMEA 2000 networks require a 12V DC supply.
In addition, a correctly functioning network will require the
following components :
• 1 x Power-T
• 2 x Terminating Resistors
• 2 x T-Pieces (one per connected device)
• 2 x NMEA 2000 Devices (such as the
NGT-1
)
All the required network parts can be supplied by the
range.
“Figure 2 - NMEA 2000 Minimum Network
for an example network. Note
that the diagram should not be used as an installation
guide. NMEA 2000 networks should only be installed
following the NMEA 0400 specification and all wiring
should be in accordance with the regional code of practice
for installations.
The
NGT-1
has a male Micro connector as specified by the NMEA 2000 standard. This allows the
NGT-1
to be connected
directly to an NMEA 2000 bus without complication. If you are using an alternative proprietary CAN bus network, a
suitable adapter cable will be required. It is recommended that the manual for any proprietary CAN bus network devices
be consulted to determine the suitability of connecting an NMEA 2000 device such as the
NGT-1
.
The NMEA 2000 drop cable on the NGT-1 is 1.5 meters long, which can be extended as required up to a maximum of 6
meters (from the NMEA 2000 backbone), see
“Table 1 - NMEA 2000 Cable Length Rules”
. Any drop cable extension
should be securely connected to ensure reliable operation.
Please refer to,
Connecting to an NMEA 2000 Network
Power Tap
(A2K-MPT-1)
T-Peice
(A2K-T-MFF)
T-Peice
(A2K-T-MFF)
Terminator
(A2K-TER-F)
Terminator
(A2K-TER-M)
12v
Example Device
Example Device
Figure 2 - NMEA 2000 Minimum Network Requirements Diagram
Summary of Contents for NGT-1
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