Hello,TI engineer,When I did the IEC61000-4-6 test on the 485 interface (10V 150K~80Mhz), there was interference on the 485 signal line. The communication method adopts self-loopback. For example, RS485-1 channel and RS485-2 channel loopback communication.
During the test, it is judged whether the communication is normal by watching the signal light on or off. If the communication is interrupted, the signal light will be on; if the communication is normal, the signal light will not light. However, the observed waveform at the 485 AB end is now disturbed, as shown in the following figure.
the rx tx signal which connect to FPGA is not Not affected。Does this situation indicate that my RS485 can withstand the IEC61000-4-6 test?OR NOT?Where do I need to improve?