17
TracNet H90 Installation Guide
Connect an NMEA Talker
Connect an NMEA Talker
The antenna requires a vessel heading input from a
customer-supplied NMEA 0183 or NMEA 2000 talker.
Optionally, you can also provide a vessel position input to
serve as a backup to the antenna’s built-in GPS.
NMEA 0183
1. Connect the NMEA 0183 talker to the 2-position
terminal strip connector (supplied in kit), as shown in
Figure 31. Then plug the connector into the rear panel
of the BDU.
2. Configure the NMEA device to transmit one or more of
the supported NMEA 0183 messages at 4800 baud.
3. Make sure the data message(s) includes the
checksum, identifiable by a *xx field at the end of the
data sentence (e.g., $HEHDT,123.4, T*1F). See
“Verifying the NMEA 0183 Message” on page 38 for
details. Do not exceed a 10 Hz input rate.
Note: To supply both the required heading and the
optional position to the BDU, you can either connect an
NMEA 0183 talker that transmits both messages, or
connect two devices using an NMEA data multiplexer, such
as Actisense
®
model NDC-4.
Figure 29: Supported NMEA 0183 Messages
NMEA 2000
1. Connect the BDU to the vessel’s NMEA 2000 CAN
network backbone via a “T” connector. Be sure to use
a standard drop cable: 5-wire (4 conductors + shield)
twisted pair with micro-C connectors.
2. Configure the NMEA device to transmit one or more of
the supported NMEA 2000 messages.
Figure 30: Supported NMEA 2000 Messages
Figure 31: NMEA Wiring
NMEA 0183 $--XXX Description
Heading Messages
HDG Heading, Deviation & Variation
HDM Heading, Magnetic
HDT Heading, True
OSD Own Ship Data
THS True Heading & Status
VHW Water Speed and Heading
Position Message (Optional)
RMC Position (Optional)
PGN Description
Heading Messages
127250 Vessel Heading
Position Message (Optional)
129029 GNSS Position Data (Optional)
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