Campbell Scientific RF400/RF410/RF415 Spread Spectrum Radio/Modem - Manual (Page 38)

RF400 Series Spread Spectrum Data Radio/Modems
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10. PC208W.dnd file corrupted
The remote possibility exists that this file has become corrupted in your
PC. After you create the Network Map in PC208W, you can back up
PC208W.dnd in case this should happen. If this appears likely, exit
PC208W and copy and paste your backup file over the suspect .dnd file
to restore proper operation.
11. RF400 has wrong Network Address, Radio Address, Hopping Sequence,
or Standby Mode
It is improbable that an RF400 that has been working would ever change
address, hopping sequence or other settings. However, check the settings
for the unlikely event this may have happened. Try “Restore Defaults”
and set up RF400 again from that point.