1. Check if the jumper cap is loose or off; If the jumper cap is not loose, make sure the jumper cap is in the correct direction.
2. Check and confirm that the serial line used to connect the controller is a straight line, not a crossover line.
3, check and confirm that the serial connection line is intact and there is no loose or off at both ends.
4. Control software of LED display screen and its own choice of control card to select the correct product model, correct transmission mode, correct serial number, correct series transmission rate and control system hardware address bits and serial transmission rate are correctly set against the code switch diagram provided in the software.
5, to ensure that the control system hardware is properly on the electricity.
6, if after the above inspection and correction still appear to be loaded, please use a multimeter to measure, whether the connected computer or control system hardware serial port is damaged. To confirm whether the computer manufacturer should be returned or the control system hardware returned to the test.
In short, the cause of the abnormal load LED display, it may be the product itself, or you may be using the process of improper operation caused. It's easy to find the root of the problem if you think about it or ask the manufacturer.