What are the hardware and software problems of LED electronic display control card?

May 12,2021| LED Knowledge

When many technicians are operating the LED electronic display screen, the software or hardware and software abnormalities of the display screen often appear. What is going on?


One, software application

1. What should I do if a display item disappears after only flashing when it is displayed?

When previewing the script or displaying the script on the screen, an item is found to flash by, please check whether the dwell time of the item is set to 0 or 1, and increase the dwell time value.

2. The alignment of the setting does not match the text position in the display window?

If the alignment used does not match the text position in the display window, please check the beginning or end of the text in the edit display text box, and delete unnecessary spaces and carriage returns.

3. How to clear the contents of multiple windows at the same time?

Just use the clear button.

4. Why does the text that is set to scroll to the left look like a pause?

The display mode is scrolling, direction: the left text display item, scrolling is not stable, and there is a momentary pause when regularity occurs. Please check the scrolling speed of this item and increase the scrolling speed value.

5. How to choose an animation file?

When making picture files, just select GIF animation files!

6. How to make a display item be fixed on the screen and never disappear?

If you want a display item to always stay at a fixed position on the screen, then you should not set and clear the screen when adjusting the display mode of the display item, and avoid the window position of this item when adjusting the display window of the display item. , So as not to cover this item.


Two. Hardware connection

1. When the LED control card is normal, why the LED electronic display has no display or the brightness is abnormal?

After the LED control card is connected to the display driver, the default is 16 scans. If there is no display, please check whether the data polarity and OE polarity settings in the control software are correct; if the brightness is abnormal, one line is particularly bright, indicating that the OE setting is reversed. Please set OE correctly.

2. When using GSM data transmission or remote dialing, how to solve the problem of unsmooth communication?

When the communication is not smooth after connection, if you are not sure where the problem is, you can adopt the method of segmented detection.

3. How to judge whether the LED control card is working normally?

After the LED control card is powered on, please observe the power indicator first. The red light is on to indicate that the 5V voltage is connected. If it is not on, please turn off the 5V power supply immediately. Check whether the 5V working voltage is connected well, whether it is overvoltage, reverse connection, failure, output short circuit, etc. Please use a separate 5V power supply to power the LED control card. If the red light is not on, it needs to be repaired.

4. Why is the communication not smooth when the 485 network is connected?

Please check whether the connection method of the communication line is correct. Connect the communication lines of each screen to the computer interface by mistake. This will generate strong reflected waves and cause serious interference to the transmission signal. The correct connection method should be adopted, see "Communication Interface Use and Precautions" for details.

5. Why can't the led electronic display screen display normally after the information is loaded?

Check whether the scan output selection in "Control Card Settings" is correct.

6. Why does the system prompt "An error occurred and the transmission failed" when sending information to the LED control card?

Please check whether the communication interface is connected correctly, whether the jumper on the control card jumps to the corresponding level position, and whether the various parameters in the "control card settings" are correct. Also, whether the working voltage is too low, please use a multimeter to test, first make sure the voltage is above 4.5V.

First check if there is a problem with the MODEM, disconnect the MODEM connected to the control card, and connect this MODEM to another computer, so that the MODEM at the sending end and the receiving end are both connected to the computer and leave the control system. Download a software called "Serial Debug Assistant" from the Internet, and use it to set up and debug the MODEM after installation. First set the MODEM of the receiving end to automatic answer. The setting method is: open the serial debugging assistant at both ends, and enter "ATS0=1 Enter" in the serial debugging assistant of the receiving end.

This command can set the MODEM of the receiving end to automatic answer. If the setting is successful, the AA indicator on the MODEM will be on. If it is not on, the setting is unsuccessful. Please check whether the connection between the MODEM and the computer is correct, and whether the MODEM is powered on. After the automatic answer is set successfully, enter "ATD 6515780 (receiving end phone number) Enter" in the serial debugging assistant of the sending end to dial to the receiving end.

At this time, some information can be transmitted from the sending end to the receiving end, or from the receiving end to the receiving end. The sending end transmits some information. If the information received at both ends is normal, the communication connection has been established, and the CD indicator on the MODEM is on at this time. The above process is normal, it proves that the MODEM communication is normal and there is no problem.

After checking the MODEM, there is no problem, if the communication is still not smooth, the problem may be the control card setting. Connect the MODEM to the control card, open the control card setting software at the sender, click Read Back Settings, check whether the serial port baud rate, serial port, protocol and other settings are correct, and click Write Settings after changing. Open the offline king software, set the corresponding communication interface mode and parameters in the communication mode, and finally transmit the script.

  Article KeyWords:LED electronic display control card


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