It is possible that the COM port is not selected, it can be set in the text editing software, or whether other programming software is open, which will occupy the COM port. Or the text editing software version is incorrect.
Xinjie programming port is RS232; Xinjie has a matching communication line.
There is a COM port on the computer that has a download line that can be connected directly;
The editing software can be downloaded from the Xinjie website.
The text editing software can not be used casually. It needs to be based on the hardware of the text display. For the specific hardware version, please see the back of the text display. After each model, there is a text wrapped in an ellipse, such as V8.0. V6.5 and so on, this is the hardware version. For the software, the editing software version used for hardware version v4.0 to V7.0 is V6.5Z version, and the hardware version V7.0 or higher is used for editing software of V8.0C.