Run Exception When Serial Isn't Connected

edited December 2017 in Arduino

Hi, I'm new here. I have a problem with arduino and processing. My scope is to know if arduino is connected or not, but I don't know how I can do that. I try to use setDTR, but I don't find any changes, messages or actions. I find notifyAll and notify functions, but I don't know how I have to use them. I'm very sorry for my english: I'm an Italian student and I'm learning english, but I'm not perfect. I'm waiting for a reply.

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