The switch at the right is used to reset the linking device and the other 2 switches are reserved for the future use. Please refer to the attached file (Appendix A Resetting FBUS-HSE/H1 LD, and Figure A-1) for the details.
Thanks a lot for your report! Would you please try the software way to verify the reset operation?
After the reset, please run Interface Configuration Utility or NI-FBUS Configurator. If the existing configurations (the most obvious example is the device tag) are cleared, it means the reset takes effect.