The following is a LED display control card hardware connection frequently asked questions, we hope to be able to help.
1.How to determine the control card is working properly?
A: The power control card, please observe the power indicator light, red light indicates 5V voltage is connected, if not light immediately turn off the 5V supply. Check the 5V operating voltage is connected, whether over-voltage, reverse polarity, failure, output short circuit. Please use a separate 5V power supply for the control card. If the red light is not lit, it needs repair.
2.Control card normal, why not display or display brightness anomaly?
A: The control card is connected to the display driver is powered, the default is 16 scans, without display, check control software OE polarity and data polarity is set correctly; if abnormal brightness, a line of special light, that OE is set backwards Please set the OE correctly.
3. Why transmits information to the control card, the system prompts "An error occurred, the transmission failed"?
A: Check the communication interface connections are correct, the jumpers on the controller card whether the jump in the appropriate level position, "controller card settings" parameters are correct. Also the operating voltage is too low, measured with a multimeter to ensure the voltage of 4.5V or more.
4. Why After the information is loaded, the display can not be shown?
A: Check the "controller card settings" Scan output selected is correct.
5.485 Network Communication Why not smooth?
A: Check the communication cable connections are correct, each screen mistakenly cut communication lines connected together to a computer interface, so that will have a strong reflected wave transmission signal cause serious interference. It should take the right connections.
6.When using the GSM data transmission or remote dial-up, how to solve the problem of communication is not smooth?
A: When communication does not work normally after the connection, if you are unsure where the problem can be taken segmented detection methods.
First check if there is a problem MODEM, MODEM disconnect the control card connected to the MODEM is connected to another computer, so the sender and receiver are connected to a computer MODEM on, but from the start of the control system. Downloaded from the Internet a "serial debugging assistant" software, use it to set after the installation and commissioning MODEM. First receiving end MODEM set to auto answer, setting method is: both ends open the serial debugging assistant, enter "ATS0 = 1 Enter" at the receiving end of the serial debugging assistant, MODEM set this instruction may be at the receiving end to auto-answer, Set on the success of the AA MODEM bright lights. If light is set not successful, check the connection to the computer is correct MODEM, MODEM is powered. After the auto-answer set up, at the sending end serial debugging assistant enter "ATD6515780 (the receiving end of the telephone number) Enter" to dial the receiving end, then it can from the sender to the receiver pass some information to be sent from the receiver to end pass some information, if the information received at both ends are normal, the communication connection has been established, then the CD indicator lights on MODEM. The above process are normal then prove MODEM communication normal, no problem.
MODEM checked no problem, if communication is still not clear, the problem may be set on the control card. MODEM connection with the control card, the sender is set to open the control card software, click on read-back settings, check the serial port baud rate, serial port, protocol and other settings are correct, click write after changing settings. Open offline king software, communication interface mode and set the corresponding parameter in the communication mode, and finally sent the script.