Siemens SIMATIC RF650R Configuration Manual page 246

Service and maintenance
9.5 Restore to factory settings
between the WBM and browser is lost. You can only recognize when the restore process is
completed based on the "R/S" LED. After restoring, the reader is restarted. The reader is
ready for operation when the "R/S" LED is lit/flashes green.
After restarting the reader, you may need to assign a new IP address or a new device name
to the reader.
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SIMATIC RF650R/RF680R/RF685R
Configuration Manual, 10/2015, C79000-G8976-C386-03