I don't know. But even Scanners must have diagnostic commands. I don't know the logic of your application, and why you want to close the COM, why you not just leave it open?

>What do you mean by "send"?
>I have a scanner attached to the comm port. Can I send data to it?
>>>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.