Installation of the BDU
98-175666-D Chapter 2: Installation 2-28
NMEA 0183
The NMEA 0183 connection supports IEC 61162-1 and IEC 61162-2.
• IEC 61162-1, baud rate 4800, format 8N1.
• IEC 61162-2, baud rate 38400, format 8N1.
The baud rate is auto detected by the BDU, the user cannot configure this interface.
Supported NMEA strings in order of priority (Talker ID):
1. HExxx (North seeking Gyro compass)
2. GPxxx (GPS compass)
3. HNxxx (Non-North seeking gyro compass)
4. IIxxx (Integrated Instrument)
5. HCxxx (Magnetic compass)
Any HDT sentence is supported as long as it complies with the following header
format: $xxHDT where xx e.g. GP for $GPHDT.
Any HDG sentence is supported as long as it complies with the following header
format: $xxHDG where xx e.g. GP for $GPHDG.
Recommended NMEA 0183 cable: Ethernet Cat. 5 or better.
GPIO RJ-45 connector
The Tx mute function can be controlled with a simple switch connected between pin 1
(Tx mute) and pin 2 (12 VDC). The Rx lock function is high and becomes low when the
modem is not in Rx lock.
Outline on BDU Pin I/O Signal Pin function
1 I GPIO1 Tx mute (active high)
2 O 12 VDC / 500 mA Power output
3 O GPIO2 Rx lock (open drain)
4 O GPIO3 Generic VSAT profile
active
5 GND Ground
6 O 12 VDC / 500 mA Power output
7 N/A GPIO4 Future use
8 GND Ground
Shield PCB ground PCB ground
Table 2-16: RJ-45 GPIO connector, outline and pin assignment
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