Furuno FS-1575 Service Manual page 161

4) EXTERNAL ALARM is outputted via the contact of photo relay. This contact is
normally closed and will be put into an open state when an alarm is outputted.
To put the contact into a normally open state, change the jumper [J8] on the T-IF
board.
The maximum rating on the output side is 120 mA/350 VDC.
Reference)
The resistance of the EXTERNAL ALARM contact output is approximately 25
ohms (non-polar) when it is closed. The resistance is high when it is open.
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1
4
3
4
3
2
Fig. 4.3.2 EXTERNAL ALARM I/F
4-25
J8
TB7
3
2
1
J8:
1 − 2: NORMAL OPEN
2 − 3: NORMAL CLOSE
4.3 SYSTEM