My CRT can display the information, however I cannot input any command

hello, guys
My CRT can display the information, however I cannot input any command
what's wrong with it ?
what can I do ?

(1) Check whether the CRT orthe HyperTerminal is used. If CRT is used, uncheck CTS/RTS.

(2) If an additional cable is used, confirm whether the driver is installed correctly.

(3) Change the baud rate. The baud rate forthe version 1T8 is 115200 bps.

(4) Change the console cable and the PC.

Summary: Other faults caused by the CRT traffic control function (if you forget to close it).

(1) You can not use CRT to log on to the console.

(2) After CRT-based logon, the operation window is blank, the system outputs no information but the cursor flashes. The system has no response after you press Enter.

(3) After CRT-based logon, the operation window is blank, the system outputs no information but the cursor flashes.After you press Enter, the cursor moves but the system still outputs no information.

(4) After CRT-based logon, the system outputs information, but has no response after your press Enter and does not allow you to perform any operation.