Hitachi PH Instruction Manual page 40

Diode system (applicable to DC, inapplicable to AC)
2
The peak inverse voltage of the employed diode must be at least 10 times as high as
the employed voltage, and its forward current must be larger than the load current.
1.5.3-2 Fault signal output
The following describes the wiring of the signal that is outputted to the outside for the
purpose of indicating that the IJ printer is in the fault mode.
(a) When using the NO contact (make contact)
Status indicator
lamp or the like
Power supply
(b) When using the NC contact (break contact)
Status indicator
lamp or the like
Power supply
TB2
1
2
Diode
3
TB2
4 NC
5 NO
6 COM
TB2
4 NC
5 NO
6 COM
5-6 contact
Fault state Closed
Normal state Open
4-6 contact
Fault state Open
Normal state Closed
●Connection of signals 1-29