I have only been using Labview for about a year, so there maybe some simple setting I changed that I am un-aware of. However this problem has me stumped. I have several large programs that send commands and received data using the COM port, and these have been working in the past. However, in December a static discharge on our equipment damaged my PC's COM port on the motherboard. For about a month, I was using a USB-Serial adapter with mixed results but last week the USB-Serial started failing constantly. I finally got around to replacing my motherboard and getting a true COM port back thinking that would solve the problem, but the COM port still fails. Windows and MAX both see the port, however if I attempt to configure the port using VISA, I always get "Is Port Connected? = False" This is element 10 in the property node of the VISA device.
Our company has an independed software packaged to talk to our products using the same COM port and it works fine now that my motherboard has been replaced. Therefore I pretty sure All is well with Windows and the COM port hardware.
I've been using 8.6 for several months, but I still have 8.5.1 installed from a prior update. I loaded an older serial port VI into 8.5.1 and it works just find. When I load the same VI into 8.6, it fails.
I have used Close VISA.vi and Close Serial Driver.vi but they have no affect. It just seems that to my 8.6 installation of Labview, the COM ports are there, but not accessable. In MAX, I get the following error when I try to Validate the port; "Could not open a VISA session to "ASRL1::INSTR". VISA error code 0xBFFF0072. The resource is valid, but VISA cannot currently access it.
Thanks for your help.