Editing Picture Transfer Protocol (section)

==Device control==
Many modern digital cameras from Canon and Nikon can be controlled via PTP from a USB host enabled computing device (smartphone, PC or [[Arduino]] for example).  As is the norm for PTP, the communication takes place over a USB connection.  When interacting with the camera in this manner, it is expected that the [[USB#System design|USB endpoints]] are in (synchronous) Bulk Transfer Mode, for getting/setting virtually all the camera's features/properties (such as ISO, Aperture, Shutter speed and focus).  Events raised by the camera, in response to specific actions performed by the host device, are sent back to the host via the USB asynchronous Interrupt endpoint.

In addition to changing the camera's settings and operating mode, it is possible to receive a through-the-lens view using "Live View". As described above, the storage objects of the camera's memory cards can be manipulated too.

By controlling a camera in this way it is possible to augment its capabilities.  For example, if the controlling software was running on a smartphone with [[GPS]] functionality, it would be possible to add the GPS coordinates to an image's [[Exif]] data, at the time of image capture — even if the camera itself had no GPS functionality.