Topic Tag: pin 1 Search for: HomePage › Forums › Topic Tag: pin 1 Viewing topic 1 (of 1 total) Topic Voices Posts Last Post What is pin 1 on the DB25 connector used for? Started by: Peter Gregson in: HobbyCNC PRO 3 & 4 Axis Board Assembly 2 4 2 years, 5 months ago BrianV Viewing topic 1 (of 1 total)