4.3 12P function port description
1. Suction air Hook thread : 1, 7 (+32V)
2. Hook thread Suction air : 2, 8 (+32V)
3. Oil level sensor : 9 (+5V) , 10 (DGND) , 4 (signal)
4. Knee lifter Presser foot : 3 (+5V) , 11 (DGND) , 5 (signal)
5. Presser foot electromagnet : 6, 12 (+32V)
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