Hi,
I'm guessing that it's a missing configuration or initialization.
You need to check if the panda placer control board is working.
At this stage, DON'T use openpnp. But from your computer connect via usb to your board.
Panda placer should use Marlin firmware.
Search on google: "how to connect to marlin via usb"
Send to your control board some basic gcode commands.
For example, try to move along the X axis and see if it works.
Before, I recommend replacing the usb cable with a new one
and double check if the panda place power supply is properly connected.
In any case, don't worry., The panda placer seems easy to replace broken pieces.
Pierluigi