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hi!!

How to close COM port??
I want changing port by flexibly(?) ..

so.. example

1> com1 open
2> recv & send (communication)
3> com1 close
4> com2 open
5> recv & send (communication)
6> com2 close


or 

1> com1 open
2> com2 open
3> com1 recv & send (communication)
3> com2 recv & send (communication)
4> com1 close
5> com2 close

im very ....
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