ADLINK PXIS-2670 - Manual (Page 17)

Installation 9
2.4 Grounding on the Mounting Holes
There are two kinds of grounding for the mounting holes of the
backplane. The mounting holes labeled as “GND” with “circle sol-
dering mask” connected to the logic ground plane of the back-
plane. The mounting holes labeled as “FGND” with “square
soldering mask” not connected to the ground plane therefore pro-
viding isolation between the logic ground and the chassis ground.
The backplane is mounted on the PXIS-2670 through all mounting
holes by default, therefore the chassis ground is shorted to the
logic ground. For applications that require isolation between the
logic ground and the chassis ground, users can remove the
screws on the GND mounting holes.