Download and install the terminal program – https://www.stoneitech.com/download/uart-communication-software-sscom32-2/
Connect the display to the computer via the adapter that comes with the display (make sure the jumpers on the adapter are set to RS232). Run the terminal program, select the desired port there, set the speed to 115200 and click the “Open com” button. Now you can enter commands in the bottom line and send them with the “SEND” button. A large text box will show whatever the display sends back.