How to set up the communication port of Mitsubishi PLC programming software? I just set up the COM number. I just bought a Mitsubishi PLC program download line USB interface.

You should check the port number of your USB programming cable that is visualized in the port of the hardware manager, such as COM8, then set it to COM8 in the programming software.
In general, COM4 or above will be visualized on the notebook, and COM6 or above will be visualized on the desktop.

Can USB-RS422 connect directly to the PLC?

I use the Mitsubishi FX series PLC and the computer of Tsinghua Tongfang Fengrui 42A. I bought a USB-SC09-FXUSB-RS422 cable and also brought a CD. I installed it but could not communicate with the PLC.

It should work well, this cable 422 port has MD8M plug, plug in the PLC communication port, set the communication parameters to download the program (FX series PLC). Note that the local cable should be set to connect local connection to USB.
That is, parameters such as the baud rate should be set the same. Is that your local connection is the default one of the COM ports, and you select USB.

Is the FX3u and FX2n programming cable shared? Is it SC09?

Support
The SC-09 programming cable is a conversion cable from the RS232 interface (commonly known as a COM port) to RS422 interface. It is commonly used in Mitsubishi A series and FX series (FX2/FX2C/FX2N/FX0/FX0N/FX0S/FX1N/FX1S…) PLC, support All communication protocols, for computer-to-PLC programming communication and various PC monitoring software, and can replace the Mitsubishi communication module FX-232AW (or FX-232AWC), the RS422 port and RS232 port of the cable have built-in ± 15kVESD protection circuit , can be charged and plugged in any way.
If you are communicating with a Mitsubishi F1/F2 series PLC, you need to install the F2-20GF1 communication module.
If your computer uses a USB port, please use the USB interface programming cable USB-SC09.
The main technical parameters:
• Both the RS422 port and the RS232 port have a 15kVESD protection circuit that can be plugged and unplugged at any time.
• Baud rate: 0 to 230kbps adaptive
• Cable length: 3 m, fully shielded, with ground wire
• With communication indicator, LED flashes during communication
• Operating temperature: -20 ~ 75 ° C

Usb-sc09 driver supports win8?

1. Right-click on the blank space on the desktop, and the “All Apps” option will be displayed below the desktop. Left-click on “All Apps”.
2. Left-click on “Control Panel”.
3. The second type gets into the “Control Panel” method. Press the “Windows” and “X” keys on the keyboard at the same time and click “Control Panel”.
4. Left-click on “Hardware and Sound”.
5. Left-click on Device Manager.
6. Left click on the device class to upgrade, right-click the device name, and left click on “Update Driver Software”.
7, upgrade the driver can choose to automatically update online and manually specify the driver location update, select automatic update below.
8, the system will automatically find matching driver installation online.
9, update the driver can choose online automatic update and manually specify the driver location update, the following chooses to manually specify the driver location update.
10. Click “Browse”.
11. Select the drive location directory and click OK.
12. Click “next”, the system will automatically install the selected driver, and the installation steps are completed.
Step 10, please select the directory where the device driver is placed according to the actual situation.