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As this is a site for an Ethernet/network analyzer tool, it's probably not the best place to ask about serial communications. You might have better luck over at one of the automation sites, like https://www.plcs.net, for instance.
That being said, this has come up before. Lots of good links to point you in the right direction:
https://osqa-ask.wireshark.org/questions/23243/how-do-you-capture-serial-com-communications
As this is a site for an Ethernet/network analyzer tool, it's probably not the best place to ask about serial communications. You might have better luck over at one of the automation sites, site, like https://www.plcs.net, for instance.
That being said, this has come up before. Lots of good links to point you in the right direction:
https://osqa-ask.wireshark.org/questions/23243/how-do-you-capture-serial-com-communications