External Alm Output Setting (N.c, N.o) - Furuno FS-1575 Service Manual

4.10 EXTERNAL ALM Output Setting (N.C, N.O)

When a DSC message is received, EXT ALM output (#7: H - #8: C of TB7) will be
activated. The EXT ALM output type can be set to "Normally Closed" or "Normally
Open." The factory set is "Normally closed."
Reference)
EXT ALM output (#7: H - #8: C of TB7):
When the ALM contact is closed, the output resistance is approximately 25
ohms (nonpolar). When it is open, the resistance is high.
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1
4
3
4
3
2
Fig. 4.10.1 EXTERNAL ALARM I/F Circuit
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4.10 EXTERNAL ALM Output Setting (N.C, N.O)
J8
TB7
3
2
1
J8:
1 − 2: Normally Open
2 − 3: Normally Closed