Question edited.

Need to understand the serial communication protocol between a USB device and PC, that uses serial over USB communication. I was planning on using a software based approach for serial port sniffing / monitoring / logging the serial communication.

My constraint is availability of PCs running Windows 7 64-bit only, and none of the methods I have come across work on this setup. Here are some that I've tried:

Looking for alternative ideas, approaches ? Hardware based approach would not be my first choice, but anything that can be done at a low-cost, or better still -- DIY, I'd love to hear more.

  • Do you want to use a Hardware logger? Sep 1, 2013 at 9:41
  • 1
    @moses, done. Hopefully it is no longer a product recommendation query. OTOH, I hope an answer can be valid with a product recommendation, as a solution.
    – bdutta74
    Sep 1, 2013 at 17:23
  • @AmirrezaNasiri, if those are the only working alternatives, then I could go for hardware logger. Hardware loggers for USB-based devices (even though they use serial over USB), I think - are both complex and expensive, no ? Anyhow, open to suggestions.
    – bdutta74
    Sep 1, 2013 at 17:23
  • @icarus74 i know several open sources with different capabilities and for different tasks. You need serial port sniffing/monitoring soft for individual tasks or for enterprise ?
    – Ice
    Oct 18, 2013 at 12:23
  • @Ice, for individual task back then. Although I am no longer working on the project, it'd still be good to know what the options are.
    – bdutta74
    Oct 7, 2015 at 6:10

1 Answer 1


I think the best way to understand the serial communication is with special software( as you were planning). You need to sniff and monitor serial port ? And with windows 7 x64 support.

Then try this soft - Eltima Serial Port Monitor: http://www.eltima.com/products/serial-port-monitor/

It can analyze and monitor all serial port activity in a system. Besides, with serial port sniffing.

  • 2
    You forget to add : App is not free. But with free trial.
    – Ice
    Oct 18, 2013 at 14:32

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