Want to start by saying I'm a mechanical/aerospace engineer, and I'm fairly out of my depth here. My current project is on a load-testing rig. Ultimately, it will use a Honeywell HG1120 IMU to give the location/orientation of a test article. I have so many questions that it's hard to know where to begin, but I'll start with a couple basic ones:
1) The table below shows the connector pin description (as a side note, the document doesn't give a pin schematic, would it be safe to assume 1 is in the upper left, increasing in number to the right?). I have read that I need to connect voltages to both pins 11 and 12 for power, but seeing no VSS, do I need to decouple these with any grounds (frankly, I'm not even sure what that wiring should look like).
2) What does the PWR_RTN (Power Return) pin refer to? Do both of these pins need to be wired, and to what?
3) Given the choice between SPI and RS-422, which would be more "user-friendly" to implement on a PC with LabView?
Any help at this point is appreciated, but the simpler terms the better (at least giving me a direction to learn in).