DSLRBodies

The following are the pinouts for the Nikon hot shoe:

x    4
   1
2    3

• Pin 1 — X (trigger)
• Pin 2 — Rdy (ready to fire)
• Pin 3 — Q (quench flash)
• Pin 4 — SP (Speedlight present
• mount — GND (Ground)

Note that different voltages are used on some of the pins to form a communication between camera and flash about abilities and state. 

This information is not verified, nor it it certified by Nikon. Use at your own risk.