Why do I fail to log in to the AR through the console interface

Use the following method:
1. Check whether parameter settings on the console interface are correct.
   - Baud rate: 9600
   - Data bit: 8
   - Stop bit: 1
   - Parity check: none
   - Flow control: none
2. Check whether the console cable is securely connected. If necessary, replace the current cable with a new one to check whether the cable is faulty.   
3.  By default, no flow control mode is configured on an AR. Because RTS/CTS is selected in the software by default, you need to deselect RTS/CTS; otherwise, you cannot enter commands.

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