Furuno FSV-84 - Manual (Page 62)

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3.6.2 Choosing echosounder signal
There are two kinds of echosounder signals, AC signal and DC signal. Set the appropriate
jumper on the CONE board (10P6905) as below according to the input port. The default
setting is AC. See previous for parts location.
Input port Jumper
ES1 J496
ES2/NET J497
Note: The SIGOUT (AC signal) terminal and REC terminal (DC signal) in the output port
are provided for a FURUNO echosounder. Therefore, when using the SIGOUT
terminal, it is not necessary to change the above-mentioned jumper setting.