1、 Preparation work

1. One console cable, as shown below, with RJ45 crystal head on one side and DB9 serial port on the other side

2. Check if there is a DB9 male interface on the computer, as shown below. Generally, desktop computers have it, but laptops come with very few:

3. If there is no serial port, you can purchase a USB to console debugging cable, as shown in the figure below. The flat head part is connected to the console cable, and the USB part can be found on the computer's USB interface. The final connection effect is:

Console port of the device - console cable - USB conversion cable - USB interface of the computer

4. Prepare CRT or Putty programs on the computer. Taking CRT as an example, the CRT looks like this:

Next, check if the driver is installed. Click on "Computer" (or "My Computer") in the email and select "Manage"

Then click on the Device Manager in the left navigation bar to see if there are "COM and LPT" options, as shown in the following figure:

If there is no need to rush, there is no indication that the driver is not installed. The following methods can be used to solve the problem:

Method 1: Install through the built-in driver CD

Method 2: Update the driver program through Windows

In the Device Manager, you will see an unknown device and select 'Update Driver Software' in the email

Then choose to install the driver through the internet

Method 3: Install Driver Elf

If the installation fails or the driver cannot be found, download a driver wizard, scan the computer driver, and it will definitely be found.

2、 Login device:

1. After completing the above preparation work, you can see which COM interface is currently being used in the Computer Management Device Manager, for example, com5 is recognized in the following figure

2. Set up CRT, click on Quick Connect, select Serial as the protocol, confirm the port selection in the previous step, make sure to select 9600 baud rate, and there is no need to check the flow control. After clicking the link, press Enter a few times to log in, as shown in the following two figures