I'm trying to get one of these guys talking through a rs-232 serial port: https://support.garmin.com/en-US/?partNumber=010-00258-62&tab=manuals
There you can download the manual which has all of the technical details.
Full disclosure: I'm primarily a software developer so this stuff is entirely outside of my wheelhouse.
My setup now: I have a 24V power supply (so acceptable voltage) but I'm having trouble confirming if the device is powered on and sending sentences (i.e. I can't tell if I'm not receiving GPS sentences because my cable pinout is wrong for the serial port or the device just doesn't have power).
This is the power supply I'm using: https://www.automationdirect.com/adc/shopping/catalog/power_products_(electrical)/dc_power_supplies/rhino_select_(din_rail)/psm_series/psm24-180s
The GPS' cable comes with a 5 pin serial port connector that you can unscrew to expose the raw pins which are held into place with screws. I've undone the screws for the red and black cables (pins 1 & 2) and I've plugged them into the power supply. Red going to a + pin and black going to a - pin.
However, I'm not sure how to confirm that the device is wired correctly and sending sentences. I've tried using an oscilloscope here but I'm kind of a noobie with that too and wasn't sure how to exactly use it to test what I think I should be seeing.
For example, I connected one part of the oscilloscope's probe to the white pin and grounded it to the black pin connected to the power supply but for some reason, I wasn't seeing anything on the scope.
Any tips or advice are very welcome. I'm largely new to electronics and troubleshooting. I do have access to both a multimeter and an oscilloscope if that helps.