Hitachi IJ RX2 Technical Manual page 38

(Precautions when using combination of NPN/PNP interfaces)
● Use either NPN or PNP interface for input/output signals #4 to 5 and #14 to 23. Do not use a
combination of the interfaces for these input/output signals.
● Interfaces can be combined for units of print material sensor signals (#1 to 3), encoder signals (#6 to 9),
input/output signals (#4 to 5, #14 to 18) and status output signals (#19 to 22).
(For example, PNP interface can be used for print target detector and NPN interface can be used for
status output signals (#19 to 22).
4-7 ●Input/output (I/O) signal connection
EZJ127 board
SW1 SW2
SW1
ON
1 2 3 4 5
SW2
Input : PNP
Input : NPN
Output : PNP
Output : NPN
Input : NPN
Output : PNP
ON
6 7 8
OFF
ON
OFF
Input : PNP
Output : NPN
ON
OFF