Power cable
Power cable
Power cable
Power cable
Power cable
Power cable
Power cable
Power cable
Power cable
Power cable
The camera, Nikon Coolpix S51c (and consequently also Nikon S51) has a proprietary connector at the bottom. It is a 26-pin connector with rectangular shape. It contains pins for power, video/audio out, USB signals, and possibly more unidentified ones.
The camera comes with two cables.
The proprietary connector pinout was reverse-engineered by disassembling the power and USB/audio/video cable. Both cables utilize an SMD connector soldered to a circuitboard. In the USB/AV cable the pins on the board were labeled. The pin numbering was devised from the pin number labels on the board.
| Pin | Signal | Label in AV/USB cable, wire color |
| 3,4 | Power, +4.8V | J, white (power cable) |
| 11 | audio out (white cinch) | G, white (AV cable) |
| 16 | video out (yellow cinch) | F, red (AV cable) |
| 18 | USB D- (USB pin 2) | E, white (USB cable) |
| 19 | USB D+ (USB pin 3) | D, green (USB cable) |
| 20 | USB +5V (USB pin 1) | C, red (USB cable) |
| 25,26, shielding | Ground, GND | A,B,H,K, black (power, USB, AV cables) |
Power cable | Power cable | Power cable | Power cable |
Power cable | Power cable | Power cable | Power cable |
Power cable | Power cable |