Hi,
The question arises as to why the "Camera Manufacturer(s)" chose a non-standard connection arrangement. It might be that they wanted to sell their own "proprietary" interface cable at an inflated price (did I hear somebody mention Apples), however, the standard 3.5mm jack socket has a pair of "Normally Closed" contacts on the Tip and Ring, but not on the Sleeve (earth). So perhaps they wanted a "Plug Inserted" logic level relative to Earth, or even to physically disconnect the Earth (supply) rail to some part of the electronics?
This reminded me that originally PEBBLE included the Legacy Header Pins Programming Socket (before my time) but the images have now been replaced by the 3.5 mm jack. However, header pins are quite useful particularly for small circuit boards, so I still use them occasionally and created some new "Legacy" images. Personally, I would have put the Earth in the middle (to make swapping TXD and RXD easy), but both configuratuions allow a standard 0.1" bridge to link RXD to GND if the 10k pulldown programming resistor has been accidentally "forgotten".
The latest version of PEBBLE does still include a section of polarised "Locking Headers", but the images don't appear to be either Locking or Polarised, and of course don't include the programming pin functions. Two files are attached which should just drop onto (overwrite) the .GIF images in the Pebble/Images folder and then (on restarting) the components found in the "terminals" section as "Program Socket Vertical for Stripboard". The overwritten original images are still available in the "Floating" section. I've also created some other component images, but won't offer them yet, until the following issue is resolved:
My component images were created in a very ancient version of Paintshop Pro and have previously worked perfectly. However, my "new" Win10 computer was opening "P_for_FF" in Edge, which seemed to work reasonably well until now. But my substituted images are "invisible" (apart from the "Terminal" name) in Pebble/Edge, even though the thumbnails seem fine in Windows Explorer, etc. (and below). I tried reading/saving the .GIF files through "Paint" but that was worse, still nothing in Edge and the "Transparent" layer attribute was lost in my other browsers. Firefox and Chrome seem to accept the modified files perfectly well, so possibly something for the (very long) Pebble thread?
Cheers, Alan.