USB-RS232 Modbus

[andreab93]

Hi everybody,

I'm a beginner in LabVIEW and I'm trying to acquire data from a microcontroller with Modbus serial protocol. I'm using a Prolific Technology USB-RS232 converter and Windows 7 as OS.

I can't communicate with the board which contains the micro. I get a 1073807246 Error ("The resource is valid, but VISA cannot currently access it").

I can't even configure it on VISA Test Panel.

Does anybody ever dealt with this problem and knows how to solve it? May it be due to USB-RS232 converter? 

Thanks any advice for any advice.

Andrea.

[Dennis_Knutson · Accepted solution]

If you had searched for the error, you would have found the most common reasons for it. Make sure no other program is using the same port. Windows will not permit more than one process to access the same port.