1. Pin assignment:
(1) 4: #4x40 inch.
(2) 3: M3mm.
(3) 2: M2.6mm.
2. Screw:
(1) S: db9 nuts / db25 short screws.
(2) N: db9 & DB25 nuts.
(3) T: db9 nuts / db25 thumb screws.
(4) X: db9 have not nuts / db25 have nuts.
(5) H: db9 nuts / db25 hex screw.
Type: 1. A: db9 male / db25 female.
2. B: db9 female / db25 male.
3. C: db9 male / db25 male.
4. D: db9 female / db25 female.