B 99-000020-02 Trigger, M12 4-pin Plug, NPN, Dark On, 2 m Cable Specifications 99-000020-02 Trigger, M12 4-pin Plug, NPN, Dark On, 2 m The 99-000020-02 Trigger, M12 4-pin Plug, NPN, Dark On, 2 m is a photo sensor with a 4-pin M12 connector. Figure B-4 shows the 99-000020-02 Trigger, M12 4-pin Plug, NPN, Dark On, 2 m. FIGURE B–4. Trigger, M12 4-pin Plug, NPN, Dark On, 2 m 99-000020-02 Schematic Vision HAWK Smart Camera Guide B-5