Help about serial programming: manipulating DTR

llandre r&
Wed Feb 2 16:52:00 GMT 2005

Hi all,

I'm trying to manipulate the DTR signal of the serial port.
As an example I used this code snippet:
I can open the com1, I can send and receive data but the ioctl I use
to read the status of the signals returns -1:

     int status;
     ioctl(upsfd, TIOCMGET, &status);

Anybody can help me? I have no idea about what's wrong with this code.

Thanks a lot in advance,


DAVE Electronics System House - R&D Department
email: r&

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