Furuno FS-1570 - Connecting Incoming Indicator

3.4 DIP Switch
3-32
3. Connecting Incoming Indicator
Incoming indicator, IC-303-DSC or IC-xxx(for future) can be connected. Select the
output circuit desired by using S4 and S5.
When IC-303-DSC is connected; S4: All ON and S5: All OFF.
When IC-xxx is connected; S4: All OFF and S5: All ON.