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USB Issue with MSP430F6632

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Hi,

 I have an problem.

I connect MSP430F6632 to computer using USB cable in VCOM mode, the device connect to computer as VCOM device,Then i try to connect as serial device using docklight or teraterm or hyperterminal then i am able to connect 

but if i left the port open (connection made by hyperterminal softwares ) and restrart the device and try to connect then i am not able to connect to the device (docklight give 'Invalid port number' , teraterm doesnt shows that port at all but in windows we can see the device being connected)

1) what could be the reason behind this?

2) How can we solve this issue.?

3) Is this a windows issue or something we can do so that we can detect the device as fresh device everytime we connect to computer (uninstalling the old *.inf file

and installing new *.inf file)

 I have used MSP430USBDevleopersPackage_3_20_00 to make device use as CDC.


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