PN548 can't read the information of individual cards, such as the speed of response is too fast. The software has not recognized and the information of the next card is acquired. Occasionally, it can be read once. There is no problem with antenna matching. The conclusion is that the antenna configuration file. And the software needs a patch, I now need some related PN548 configuration file parameters and methods, now my card type is 14443-A. Thank you!