Ok, thanks for your reply. But i have another problem: i hadn't always the hardware needed for the tests. Before i've used a terminal and com0com to simulate a serial input: if i want to simulate a transmission every 5ms how can i do? I need a program or a code that i'm sure about its correctness. Another question: may i have some problems (for example timings) to simulate with the same pc a serial transmission? Any suggestion? Thanks
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