Raymarine L1250D, Owner'S Handbook Manual

Page: 63 / 246

Chapter 2: Installation 2-31
Sea
Ta
lk
an
d N
M
EA
In
For example: VTG carries Course and Speed Over Ground data; GLL carries
latitude and longitude; DBT carries water depth; MWV carries relative wind
angle and wind speed data.
The NMEA 0183 standard carries similar information to SeaTalk. However, it
has the important difference that one cable will only carry information in one
direction. For this reason NMEA 0183 is generally used to connect a data
receiver and a transmitter together (for example: a compass sensor
transmitting heading to a radar or a GPS sensor (or Chartplotter) transmitting
position and navigation data to a radar.
NMEA Input Connection
The two NMEA/Power input connectors are normally used for non-SeaTalk
Compass (heading) data or GPS. It can also be used for additional navigation
data (if not provided via SeaTalk).
Connect the input(s) to the orange and yellow wires (Channel 1) and/or the
green and blue wires (Channel 2). Refer to
Power and NMEA Input Connector
on page 2-16 for further details.
For example, to connect a Raymarine Heading Sensor to the NMEA Channel
1 input, connect the cables and power supply using a suitable connector block,
as shown in the diagram below. If installed, it may be convenient to connect
the power to the SeaTalk auxiliary junction box described in the following
section.
Figure 2-19: NMEA Input Connection
Using the SeaTalk Auxiliary Junction Box
A junction box is used to connect the SeaTalk system to the display unit. This
junction box enables the SeaTalk bus, power and GPS to be connected.
If power is not already available (via another SeaTalk instrument), the
junction box can be used to apply power to the SeaTalk bus for other
applications. The junction box may also be used for other purposes.
+12 V
0V
+ NMEA Data (orange)
-- NMEA Data (yellow)
D3604-1
Red
Black
Yellow
81213_1.book Page 31 Monday, March 17, 2003 1:14 PM