I look for a software when it run, could take some datas from text file and send them comm port then it will collect the replys and store as text file...

I use PCVue scada program.
Scada can start the programs and pass them parameter and/or write the data as text file.
I want to control and send the some data over the comm port to modem for to establish communication. After then the scada will work collect the datas from plc, when the transmission ends scada again starts the comm program for to disconnect to modem..

 

from linux you could send command straight to the unit connected to you comport with...

echo "command" > /dev/tty0

the tty0 is your com1... for the survelance of your com port use ttywatch, you find it at freshmeat.