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Capturing OPCOM messages with a program

Something reminded me of an old bit of code I had kicking around the other day. It's basically an example in C of how to capture OPCOM messages via an operator enabled pseudoterminal.

I know that this subject has been beaten to death in the newsgroup, but to my surprise, I couldn't find a working example of code that implements any of the methods discussed. So for your enjoyment, here's a working example. You can download it at the CATCH_OPCOM section of the Downloads page.