Don't load on the LED screen communication are why

Led display and load on communication is not the same, may be a control system, a serial port connection, control software and other problems, please use the following six points one by one specific screen 1, to ensure that the control system hardware has been correct to electricity. 2, check and confirm that used to connect to the controller's serial port for straight line, not cross line. 3, check and confirm the serial ports on both ends of the cable is in good condition and no loose or falls off phenomenon. 4, control the led screen control software and control card of their selection to choose the right product model, the transmission mode of right, the right serial number, the right rate of serial transmission and control software available to dial the code switch figure set correctly on the control system hardware address bits and serial transmission rate. 5, check whether the jumper cap is loose or fall off; If the jumper cap without loose phenomenon, please make sure the jumper cap in the right direction. 6, as there is still a loaded after the above check and correction, please use multimeter measure, whether the connected computers or serial port control system hardware is damaged, to confirm whether they should get back the computer control system hardware back to detect or manufacturer.