The LED display control card is the core component of the LED graphic display. It is mainly responsible for receiving the screen display information from the serial port of the computer, placing it into the frame memory, and generating the serial display data and scanning required by the LED display according to the partition driving method. Control timing. This article will analyze and solve the control card application problems encountered in practical applications to help industry users improve application efficiency.
1. How to judge whether the control card works normally?
Answer: After the control card is powered on, please observe the power indicator first. When the red light is on, the 5V voltage is connected. If it is not lit, please turn off the 5V power immediately. Check if the 5V working voltage is connected, whether it is overvoltage, reverse connection, failure, output short circuit, etc. Use a separate 5V power supply to power the control card. If the red light is not lit, it needs to be repaired.
2. When the control card is normal, why is the display not showing or the brightness is abnormal?
Answer: After the control card is connected to the display driver, the default is 16 scan. If there is no display, please check whether the data polarity and OE polarity setting in the control software are correct. If the brightness is abnormal, one line is especially bright, indicating that the OE setting is reversed. Please set OE correctly.
3. When the information is transmitted to the control card, the system prompts “An error has occurred, the transmission failedâ€.
A: Please check whether the communication interface is connected correctly, whether the jumper on the control card jumps at the corresponding level position, and whether the parameters in the “Control Card Settings†are correct. Also, if the working voltage is too low, please use a multimeter to check that the voltage is above 4.5V.
4. Why does the display not display properly after the information is loaded?
A: Check if the scan output selection in "Control Card Settings" is correct.
5. Why is the communication in 485 network not smooth?
A: Please check if the connection mode of the communication line is correct. Correctly connect the communication lines of each screen to the computer interface together. This will generate strong reflected waves and cause serious interference to the transmission signal. The correct connection method should be adopted. For details, please refer to “Communication Interface Usage and Precautionsâ€.
6. When using GSM data transmission or remote dialing, how to solve the problem that communication is not smooth?
A: When the communication is not smooth after the connection, if you are not sure where the problem is, you can take the method of segmentation detection.
First check if there is a problem with the MODEM, disconnect the MODEM connected to the control card, and connect the MODEM to another computer, so that the MODEM of the transmitting end and the receiving end are connected to the computer and disconnected from the control system. Download a software called "Serial Debug Assistant" from the Internet and use it to set up and debug MODEM after installation. First set the MODEM of the receiving end to automatic answering. The setting method is as follows: 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 automatically answer. If the setting is successful, the AA indicator on the MODEM will be on. If it is not lit, the setting is unsuccessful. Please check if the connection between the MODEM and the computer is correct and the MODEM is powered on.
After the automatic answer setting is successful, the serial port debugging assistant at the sending end inputs the “receiving end phone number, returning†and dials to the receiving end. At this time, some information can be transmitted from the sending end to the receiving end, or can be transmitted from the receiving end to the transmitting end. 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. If the above process is normal, the MODEM communication is normal and there is no problem.
After checking the MODEM, if the communication is still not smooth, the problem may be caused by the control card settings. Connect the MODEM to the control card, open the control card setting software on the sending end, click the read back setting, check whether the serial port baud rate, serial port, protocol and other settings are correct. Click the write setting after the change. Open the offline king software, set the corresponding communication interface mode and parameters in the communication mode, and finally transfer the script.
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