Mitsubishi PLC programming line USB-SC09 and USB-SC09-FX difference

The difference between Mitsubishi PLC programming line USB-SC09 and USB-SC09-FX is:
1. USB-SC09-FX is only used for Mitsubishi FX series, and USB-SC09 is used for Mitsubishi FX series and A series.
2, USB-SC09-FX technology price is 140/10PCS, USB-SC09 technology price is 150/10PCS.
3. The USB-SC09-FX cable has a length of 2.5 meters and the USB-SC09 cable has a length of 3.0 meters.

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.