Serial device on ttySAC

I'm playing with Qt application on Tiny6410 Linux.

I'm trying to use the file /dev/ttySAC0 for serial communication.
Wanna know that can I receive data that typed from PC ?

I wrote word "Hello" to file ttySAC0 and the word appeared on PC's
hyperterminal's screen.
But when I type something on hyperterminal(I don't know is this the way we
send data from PC?) nothing in file ttySAC0 appeared, or maybe the data's
gone so fast so my application cannot capture. Because my app that wrote to
read the file can't read anything.

thanks.

I was also facing same problem. Then i have used "Qextserialport" with Qt.
Now it is working fine.

In real I want to code it as basic as possible, so I try playing with all I
have in dev.

BTW, I'll try that.

Thanks