Raytheon HSB L755, Owner'S Handbook Manual

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2-42 HSB Series L755 and L760 Fishfinder
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Using the SeaTalk Auxiliary Junction Box
A junction box is used to connect the SeaTalk system to the HSB Series
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
HSB Series 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 SeaTalk
power. Use a multimeter to check the connections.
Figure 2-31 shows how to connect the junction box; Appendix B provides
connection details for specific Raytheon, Apelco and Autohelm GPS and
Beacon Receiver systems.