>it would be too easy.
>MSCOMMControlInstance.PortOpen keeps true value even if you power the device with a comm port down.
>
>
>>>>>Does anyone know if it's possible to regularly check a comm port whether it it is still open? I tried to open a port in the form, then disconnect the device that has a comm port but the form still thinks that the port is open.
>>>>>Thanks for any idea.
>>>>
>>>>How you open and close COM?
>>>I am using mscomm activex control.
>>

>>IF MSCOMMControlInstance.PortOpen && Port is opened
>>   do whatever you want to do when the port is poened
>>ENDIF
>>
>>***
>>MSCOMMControlInstance.PortOpen = .f. && Close Port
>>

This is true. Just try to send some test command to device and see if you'll get the answer. If you don't receive any answer then close the COM.