Hi, I am new learner of PCB designing and I was wondering as I have seen different schematics, some use an RC filter on data signals of USB to RS232 converter and some don't. Is there any explanation behind when to use and when not to?
![ZJ1W`6[1L5H)3V]`TM4S0FS.png](https://pcbwayfile.s3-us-west-2.amazonaws.com/project/20/06/05/1629387361373.png "ZJ1W`6[1L5H)3V]`TM4S0FS.png")
![G]_XGF{9MQF@`LD_I%2SPML.png](https://pcbwayfile.s3-us-west-2.amazonaws.com/project/20/06/05/1629460064068.png "G]_XGF{9MQF@`LD_I%2SPML.png")
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