1: How can we effectively prevent the controller serial port burned?
Serial burned is a lot of LED display suppliers, wholesalers and engineers often encounter, but also one of the most headache.
In order to avoid similar problems in the days of communication products appear, the days of communication LED display control system used in all industrial-grade serial chip, greatly reducing the probability of burning the serial port, so as to the majority of customers friends to a certain extent The service on the trouble and trouble.
Of course, in order to effectively avoid or even eradicate this control system hardware ills, only from the supplier point of view is still not enough, it also requires customers to cooperate with the right steps and essentials to improve work efficiency and reduce unnecessary trouble.
Note from the following:
It is forbidden to connect 220V directly.
To avoid charged plug, so as to avoid instantaneous impact of power. If you need to insert, please operate after power failure.
Avoid using crossover lines to connect the control system hardware to the computer.
Such as the use of 485 bus communication, 7 then positive, 8 then negative, 5 ground, do not be positive and negative.
Measure the status of the serial port should be positive and negative, connected with the ground, not to be positive and negative phase.
2: What is the cause of the black screen of the LED display?
In the control system used in the process, we occasionally encounter LED display screen appears black phenomenon. The same phenomenon may be caused by a variety of different reasons, even the process of blacking the screen will be due to different operations or because of different environments vary. For example, it may be a power of the moment is black, it may be in the process of loading black, it may be black after the completion of sending and so on. In this case, please note that you can refer to the following aspects to determine the "fault":
Make sure that all hardware, including the control system, is fully powered up. (+ 5V, do not reverse, then wrong)
Check and confirm that the serial cable used to connect the controller is loose or off. (If the black during the loading process, it is likely that because of this cause, that is, during the communication process due to loose communication line and interrupted, so the screen black. Do not think that the display body is not moving, the line can not be loose, please It 's important for you to quickly solve the problem.
Check and confirm whether the connection between the LED display and the HUB distribution board connected to the main control card is tightly connected.
Please check and confirm whether the 50-core cable between the EQ control card and the HUB distribution board is loose or interrupted.
If your display interface definition does not match the provided HUB board, there will be a black screen. Please check your jumper for loosening, breaking or short circuit. If you think that ABCD and other signals have been one by one correspondence, please check the OE signal is connected correctly. (It is strongly recommended to use the HUB distribution board that matches the display interface definition)
3: Why is the program sent to the LED display and found on the display "leakage" phenomenon?
So far, has received a few cases on the "product leakage" case. Once the program is sent to the display, as long as one of the rows show, the other 15 points will appear "leakage" situation and virtual.
After several sets of system testing, the results show that part of the display module manufacturers to save costs and lead to lower product quality caused. If you have a similar situation, please contact your display module supplier early.
4: why in strict accordance with the operation steps, but there text or picture "dislocation" phenomenon?
Normal operation appears text or picture "dislocation", then try one of the following:
Select "Row order +1", "Row order -1" or "Normal" in the "Settings screen parameters" of the control system software;
Toggle the DA or OE in the DIP switch to enable data or enable reverse.
5: why the controller is normal when the display is not displayed above?
Controller settings and cable connection properly, sometimes LED display screen will appear there is no display of the situation, generally caused by one of the following reasons, please check the check:
Whether the LED display is powered properly.
HUB distribution board and the display connection is reversed.
Whether the edited and sent program is empty.