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No Frames Captured using Serial/USB Adapter in Wireshark

Hello,

Using an Advantech ULI-224TC RS-232 to RS-422/RS-485 converter. From the Advantech converter DB9 I'm going into my laptop with a serial to USB adapter that has driver installed. I use this adapter on several other applications and it works well. I also have NPCAP installed and verified via command line. Any ideas as to why Wireshark isn't seeing data from my USB adapter?

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updated 2025-07-11 01:51:31 +0000

Guy Harris gravatar image

No Frames Captured using Serial/USB Adapter in Wireshark

Hello,

Using an Advantech ULI-224TC RS-232 to RS-422/RS-485 converter. From the Advantech converter DB9 I'm going into my laptop with a serial to USB adapter that has driver installed. I use this adapter on several other applications and it works well. I also have NPCAP installed and verified via command line. Any ideas as to why Wireshark isn't seeing data from my USB adapter?