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Chapter 3: NMEA/SeaTalk Connections 13
3 NMEA/SeaTalk Connections
3.3 Using a connector block
When connecting a Raystar 120/112LP into an existing instrument
system or to certain Raymarine chartplotters (e.g. Raychart 630), you can
use a connector block to:
• connect into the SeaTalk bus
• supply power to the SeaTalk bus for this and other applications (if DC
power is not already available via an existing SeaTalk instrument)
Figure 3-3 shows how you can use a connector block to make the
interconnections between the Raystar 120/112LP, the SeaTalk bus and,
if required, an external DC power supply.
CAUTION:
Use a multimeter (set to an appropriate range) to check correct
polarity and connections to the 12 V DC supply before you apply
power to the Raystar receiver.
Figure 3-3: NMEA/SeaTalk wiring interconnections
Note: You can obtain a suitable SeaTalk Auxiliary Junction Box from
your Raymarine agent. It is supplied with certain chartplotter products.
Wire colour
Screen
Red
Yellow
Black
Red
Screen
Red
Yellow
Brown
Green
12 V
Power
Supply
0 V
12 V
Fused
Cable
SeaTalk
Power
RS120 or
RS112LP
Terminal
1
2
3
1
2
1
2
3
-
-
Function
0 V
12 V
SeaTalk
0 V
12 V
0 V
12 V
SeaTalk
RTCM in
Not used
To RS120
or RS112LP:
0 V: 1
12 V: 2
Data: 3
Screen
Screen
Red
Red
Yellow
RTCM
(if used)
RTCM in
Red
0 V
Yellow
3
(SeaTalk)
2
(12 V)
1
(0 V)
To SeaTalk
(typical plug shown)
Terminal
Black
Black
Green
(not used)
Brown
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