Using The Seatalk Auxiliary Junction Box - Raymarine SL72 Owner's Handbook Manual

Chapter 8: Installation 8-33

Using the SeaTalk Auxiliary Junction Box

A junction box (provided with the SL72RC PLUS Combined Radar/
Chartplotter; optional with the SL72 PLUS Radar displays) 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, e.g.
supplying power to a flux gate compass and routing the compass data to the
display NMEA In connection, or alternatively, for connecting a NMEA GPS
system.
The junction box includes:
• SeaTalk cable and connector to attach to display unit
• Power cable to connect to 12 V power (if required)
• Input connections to connect SeaTalk cable from external equipment
• Spare connections for another instrument
CAUTION:
Ensure correct polarity of the 12 V supply before applying radar or
SeaTalk power. It is recommended that a multimeter is used to check the
connections.
Figure 8-19 shows how to connect the junction box; Appendix B provides
connection details for specific GPS and Beacon Receiver systems.