I need open port cheker and found this:
http://www.pcwintech.com/simple-port-tester
This tool can check UDP port, not only TCP.
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there is a portable version at the bottom of the page you gave
http://www.pcwintech.com/simple-port-tester
Wm
I found this solution http://www.eltima.com/rs232-testing-software/
It make the log in a text file and is really simple in use. No additional settings, no hardware needed. And the trial period in 14 days.