[ts-7000] rs232 bash acquisition

["e.pifferi" <>]

hy i need to acquire data from an item on ttyS0 and  save this data on
a file.txt it's possible to do  from bash shell ?

ive tryed so : 

read variable < /dev/ttyS0 echo $variable >> file.txt

or so 

export variable=`cat /dev/ttyS0 echo $variable >> file.txt

but don't work can anyone help me 


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