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You can also run a program like minicom.  

Run minicom on that port and tie pins 2 & 3 together with a wire.  This
will loopback.  What you type you'll see.


On Tue, 2004-12-28 at 10:17, Doug McNash wrote:
> Opening the tty port should raise DTR if the bit rate is non-zero so
> 
> stty 9600 -hupcl < /dev/ttyS0
> 
> should do it.  Use stty hupcl if you want to turn if off after close.
> 
> sleep 1 < /dev/ttyS0 to pulse it for about a sec.
> 
> 
> On Mon, 2004-12-27 at 12:43, Christopher Bergeron wrote:
> > Does anyone know of a quick/simple/easy way I can raise the DTR signal 
> > on my serial port?  I'm trying to determine if the port is bad.
> > 
> 
> 
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<li><strong><a name="00912" href="msg00912.html">[ale] quick way to raise DTR on serial port?</a></strong>
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<li><strong><a name="00892" href="msg00892.html">[ale] quick way to raise DTR on serial port?</a></strong>
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