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DTR signal con serial ports ( COMs) ..... HowTO?

I was convinced that the DTR signal on serial ports should go ON when the
port is open.
That's the behaviour when I test my program on my Linux PC.
But the same program doesn't raise the DTR when running on devboard.

Is it the pin connected and managed?

How could I set it ON ? ( I have to talk with devices that check it!)

Many thanks

Flavio Molinelli
show.it s.r.l. - an E.magine company