This question applies to the legacy Photon camera models. The Photon product line and its accessories have been discontinued. The information here is provided for historical reference.
The 30-pin SAMTEC connector is the primary electrical interface to all Photon camera versions. This connector passes input power, output video, RS-232 commands, and serial digital data. The optional 15-pin D-Sub connector used on the Photon 320, 160, 120, and 80 cameras passes these same signals and voltages (power, video, RS-232, serial LVDS). The 30-pin connector provisions for external sync as well as a few spare leads that are reserved for factory and OEM customer use.
A description of the pin assignments for the 30-pin SAMTEC connector as well as the optional 15-pin D-Sub connector used on the Photon 320, 160, 120, and 80 cameras can be found at this link.
The 15-pin D-Sub connector (Photon 320) and the 26-pin D-Sub connector (Photon 640) configuration is required for compatibility with the respective Ethernet Module accessory.