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10.4.2
Restoring the factory settings manually
Requirement
The communications module has been disconnected from the power supply.
Procedure
Proceed as follows to restore all settings to factory defaults using the reader interface:
1. Create a wire jumper (wire diameter ≤ 0.8 mm).
2. Use the jumper to connect pins 4 (RxD) and 7 (TxD) of the reader X21 interface with one
another.
Figure 10-5
3. Connect the communications module to the power supply.
4. Wait until all LEDs flash for a few seconds, briefly light up continuously, and then flash
again.
5. Remove the jumpers.
6. Wait until the "RUN" LED is continuously lit in green.
Result: The communications module is reset to its original factory settings.
Note that restoring to factory settings assigns the factory-set IP address to the
communications module. Because the IP address is discarded, it is possible that the
connection between the WBM and browser is lost.
After restarting the communication module, you may have to assign a new IP address or a
new device name to the communication module.
SIMATIC RF166C
Operating Instructions, 12/2019, C79000-G8976-C578-01
Pins of the X21 reader interface to be connected
Service and maintenance
10.4 Factory settings
151
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