I have a custom circuit board that plugs into a USB port and provides 10 Com Ports (RS232).? I am having intermittent problems where some of the com ports become non-responsive.?
I have a custom Windows XP application written in VB6? that opens all 10 com ports and receives and sends data to the respective com ports.? There are intermittent problems where some com ports become non responsive to my application.? Closing and re-opening the application will re-establish the com port.
I believe I have a hardware problem where the USB to Serial Chip resets intermittently.? When the chip resets, Windows "loses" the address that it previously had for that com port, and only by closing the problem port and then re-opening the port will the com port work again.?
The USB to Serial chip is the FT232R made by FTDI:? <[url removed, login to view]>?
I can provide a bitmap picture of the complete circuit board, or can send the board to USA or Canada for hands on testing.
Looking to solve the intermittent com port functionality.
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Windows XP Professional