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No Frames Captured using Serial-to-USB Adapter in Wireshark

asked 2025-07-10 19:59:49 +0000

hy4woj gravatar image

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

Guy Harris gravatar image

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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Do you have a reference that says npcap can collect serial/USB data?

It's normally done with usbpcap which is an install choice like npcap is when installing Wireshark.

Chuckc gravatar imageChuckc ( 2025-07-10 21:10:16 +0000 )edit

Let me check but I don't remember off the top of my head!

hy4woj gravatar imagehy4woj ( 2025-07-10 21:38:49 +0000 )edit
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answered 2025-07-11 01:57:19 +0000

Guy Harris gravatar image

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.

Npcap's driver only captures on network adapters, i.e. devices that connect to the Windows network stack via the NDIS interface.

A serial device would be a network interface only if a Point-to-Point Protocol (PPP) session were being run over it. Without that the adapter would probably show up as a COM port.

I use this adapter on several other applications and it works well.

Those application are probably using it as a COM port, rather than as a networking port.

What kind of device is connected to the serial port?

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Asked: 2025-07-10 19:59:49 +0000

Seen: 37 times

Last updated: yesterday