Hello.
I'm developing a device driver for the remote control of a Powersupply with Labwindows/CVI 8.5.1.
The communication with the device is through a virtual USB-ComPort.
Using the driver-dll in a test project shows, that everything works fine.
I can open the port, communicate with the device, and also the CloseCom CVI-function returns no error.
But if I want to reopen the ComPort after closing it, OpenComConfig returns errorcode -10 (Port in use).
I am sure that the Port is no longer in use, because the Port can be opened by another application after closing it.
in Pseudocode:
OpenComConfig(COM3,...) //works fine
CloseCom(COM3) //works fine
OpenComConfig(COM3,...) //returns error -10
Thanks for help!
regards
re-G
