First I use ctrl+c end the program on secure CRT,then I Restart the application (the program is just a while loop,in the loop, i read the data from the 485 interface using uart3 of imx6,after i get the data,then i send the received data), i find debug serial can not receive data during this test。why?but i find there is data on the uart3 rx pin on the hardware by oscilloscope。