Or use gnuwin32's grep on the output of putty's plink.exe (which is the command-line client). I am able to successfully plink -batch -ssh ... | grep ... for what I need.

I was about to complain that I need a serial connection, but plink can do that, too! Cool, I never would have thought of using plink for anything else but SSH and telnet. Thank you, pryrt++.

plink -serial COM24 -sercfg 115200,8,n,1,N
[download]

... works for reading debug output from the microcontroller, but my ancient grep binary seems to buffer an insane amount of data before writing. It simply does not output anything when fed with just a few hundred lines. Replacing it with perl (from Strawberry) works fine:

plink -serial COM24 -sercfg 115200,8,n,1,N | perl -ne "/^(Pct|NRS)/ &&
+ print"
[download]

Now I just have to test it with ConEmu proposed by aitap++.

Alexander