LED display control card FAQ

LED display is mainly used to display text, images, video and other information, and supporting LED display used accessories - LED control card but need to complete the weather, geography, people and other factors in order to LED display light up If the LED control card is connected to the power supply is sufficient, the LED control card is connected to the LED display module after the software scan mode and OE direction is set to match, the LED control card and the LED display module connected to the cable is connected properly, etc. . What are the common problems of LED control card? How to solve?

First, the hardware connection 1, how to determine whether the control card is working properly?

A: After the control card is powered on, please observe the power indicator first. The red light indicates that the 5V voltage has been connected. If it is not, turn off the 5V power supply immediately. Check whether the 5V working voltage is connected properly, whether it is overvoltage, reverse connection, failure, output short circuit, etc. Please use a separate 5V power supply for the control card. If the red light is not on, repair it.

2. When the control card is normal, why is there no display or abnormal brightness?

A: After the control card and the display driver are connected, the default is 16 scan. If there is no display, check whether the data polarity and OE polarity setting 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.

3. When the message is sent to the control card, the system prompts "An error has occurred and the transmission failed."

A: Please check whether the connection of the communication interface is correct and whether the jumper on the control card jumps to the corresponding level position. The parameters in the “control card setting” are correct. Also, if the operating voltage is too low, please use a multimeter to measure the voltage above 4.5V.

4. Why does the display screen not display properly after the information is loaded?

A: Check if the scan output is selected correctly in the "Control Card Settings".

5, why 485 group network communication is not smooth?

A: Please check whether the connection mode of the communication line is correct. If you mistakenly connect the communication lines of the various screens together to the computer interface, it will produce strong reflection waves and cause serious interference to the transmission signal. The correct connection method should be adopted. For details, see "Communication Interface Usage and Precautions".

6. When using GSM digital transmission or remote dialing, how to solve the problem of unclear communication?

A: When the communication is not smooth after connection, if you are not sure where the problem is, you can use the method of segment detection.

First, check whether there is a problem with the MODEM. Disconnect the MODEM connected to the control card and connect the MODEM to another computer. In this way, the MODEMs of the sending end and the receiving end are all connected to the computer, and are separated from the control system. Download a software called "Serial Debugging Assistant" from the Internet and use it to set up and debug MODEM. First set the MODEM of the receiving end to auto answer. The setting method is: open the serial port debugging assistant at both ends, and input “ATS0=1 Enter” in the serial port debugging assistant of the receiving end. This command can set the MODEM of the receiving end to auto answer. If the setting is successful, the AA indicator on the MODEM is 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, the serial port debugging assistant of the sending end enters "ATD6515780 (Recipient Telephone Number) Enter" to dial the receiving end. At this time, some information may be transmitted from the sending end to the receiving end, or from the receiving end to the sending end. The end passes some information. If the information received at both ends is normal, the communication connection is established. At this time, the CD indicator on the MODEM is on. The above process is normal and it proves that the MODEM communication is normal and there is no problem.

After checking the MODEM has no problem, if the communication is still not smooth, the problem may be in the control card settings. Connect the MODEM to the control card. The sender opens the control card setting software. Click to read the settings. Check whether the serial port baud rate, serial port, and protocol settings are correct. After the change, click Write Settings. Open the offline king software, set the corresponding communication interface mode and parameters in the communication mode, and finally send the script.

Second, the software application 1, why the alignment of the design and display window text does not match?

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

2. Why does a display item disappear when it is displayed?

A: When previewing the script or displaying the script on the screen, it is found that the item flashed over. Please check whether the dwell time of the item is set to 0 or 1, and increase the dwell time value.

3. Why does the text scrolled to the left look like a meal?

A: The display mode is scroll, direction: the left text display item, the scroll is not smooth, there is a regular pause, check the scrolling speed of the item and increase the scrolling speed.

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

A: You can use the clear screen button.

5, how to make a display item fixed on the screen display, will never disappear?

A: If you want a display item to stay at a fixed position on the screen, you should not set a screen to clear the screen when you adjust the display style of this item. You should also avoid this item when adjusting the display item's display window. Window position so as not to cover this item.

6, how to choose the animation file?

A: When you make a picture file, you can select an animated GIF file!

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