Why no information is displayed on the console interface of an AR

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The possible causes are as follows:
- Parameter settings on the console interface are incorrect.
- The console cable is faulty.
- The path of startup files is incorrectly specified.
- The storage device (SD card or USB flash drive) saving the startup files has been removed from the AR or is not securely connected to the AR.
- The memory card is loosely connected.

Other related questions:
Why cannot ZTP execution information be displayed through the console port of a CE12800 switch
On a CE12800 switch with two MPUs, you can only log in and check ZTP execution information through the console port of the active MPU. If you log in through the console port of the standby MPU, ZTP execution information cannot be queried and the system displays only the following information: Info: The system is busy with ZTP on master console, please wait or abort ZTP throught master console. Therefore, to view ZTP execution information, log in through the console port of the active MPU.

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.

Cables of the Console Interface on an AR
The console cable is used to connect the RJ45 connector of the console interface and DB9 connector of the serial interface of the PC.

Logging in to the AR through a console interface
You can connect a PC to the console interface of an AR and then log in to the AR to perform basic configurations and management.

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