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I recently got a LeddarTech Leddar One rangefinder, which has a UART serial connector. I'm used to boards denoting the pinout directly next to the pins, but the only distinguishing mark on this board's serial connector is a small triangle pointed at the last pin (or the first pin, if you turn the board around.) Does this triangle mean the ground pin? I don't know a lot about PCB markings, and there isn't very much documentation on this product.

enter image description here

As you probably can figure, I don't quite want to find out firsthand what happens if I plug the cable in the wrong way.

Any help would be very much appreciated.

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    \$\begingroup\$ Service manual says? \$\endgroup\$ – Ignacio Vazquez-Abrams Nov 1 '16 at 2:21
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    \$\begingroup\$ A photo might help us be more sure of the answer, but a mark in the silkscreen will usually indicate pin 1. But a "triangle"could also be a description of a ground symbol, so you could be on to something there. \$\endgroup\$ – The Photon Nov 1 '16 at 2:21
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    \$\begingroup\$ Do you have an Oscilloscope so you can visually inspect which pins are data outputs? Determining which pin is the ground pin should be done by inspecting the PCB and hopefully identifying the pin(s) which are physically soldered to the ground-plane (or by referencing the manual/other online forums) \$\endgroup\$ – Logic1 Nov 1 '16 at 2:45
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    \$\begingroup\$ The square chip looks like an off the shelf microcontroller, you can probably lookup the pinout and figure out a lot from there. \$\endgroup\$ – Chris Stratton Nov 1 '16 at 4:37
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    \$\begingroup\$ "there isn't very much documentation on this product". User manual, datasheet, application notes and whitepaper all here. Google failed you? \$\endgroup\$ – Roger Rowland Nov 1 '16 at 6:27
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The data sheet for the part labels it.

enter image description here

Of course, as far as I can see online, the front of the board does not have any silkscreen. But the right most pin has a square pad. This is typically pin 1. And even on the blurry picture, its plain to see that that pin has thermal reliefs connecting it to the ground plane. Easy bet that its ground, and the rest of the pins will match the data sheet now that you have identified it.

enter image description here

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  • \$\begingroup\$ The user guide spells it out even more clearly. Not sure why the OP couldn't have found this with a quick Google. \$\endgroup\$ – Roger Rowland Nov 1 '16 at 5:57

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