Failure causes:

1, the driving program is not loaded

2, the computer screen and the screen is too long or the quality is not good

3, send card broken

Troubleshooting method:

1, Reload receiving card file

2, reduce the cable length or replacement

3,Replace the sending card

Failure causes:

1,Serial line or USB line do not connected to the send card

2,Computer interface bad or bad USB

3,Serial line or USB line is bad

4,Sending card bad

5,The USB driver is not installed