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Author Topic: USB-port working?  (Read 569 times)
KM3K
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Posts: 299




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« on: April 12, 2010, 12:40:28 PM »

Is there a diagnostic-routine that will verify that a USB-port is operating properly?
Or can I safely assume that if my HP-printer works ok from that port that all is alright there?
I'm asking because I'm having problem with a USB-to-RS232 adapter that works just fine in a Dell-desktop with XP but not so on a Dell-laptop with Vista.
BTW, I had downloaded the latest drivers.
Jerry KM3K
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AA4PB
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Posts: 12854




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« Reply #1 on: April 12, 2010, 04:28:34 PM »

The issue is most likely with the driver for the Virtual Serial Port. Make sure you are using a Microsoft certified Vista driver. I've had a couple of stability issues with non-certified drivers that came with an inexpensive adapters.

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KM3K
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Posts: 299




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« Reply #2 on: April 12, 2010, 04:53:45 PM »

OK; then I need to ask, "What is a suggested way to find out if the driver is certified by Microsoft?"
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AA4PB
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« Reply #3 on: April 12, 2010, 06:02:52 PM »

If it is not, then you will get a warning message when you install it. It will ask you if you want to install it anyway. Some drivers without the certification work just fine and some don't. I prefer to stick with converters that use FTDI chips because FTDI has certified drivers for all the operating systems on their web page.
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KM3K
Member

Posts: 299




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« Reply #4 on: April 17, 2010, 08:11:23 PM »

The adapter that I have is a Keyspan USA-19HS.
Microsoft's Vista website shows a certified-driver for that Keyspan device.
Additionally, Keyspan has a test for the USB-port and my adapter passes that test.
HOWEVER, for that test, I am concerned that nothing is ever connected to the RS232-connector; so maybe Vista is not handling whatever should be happening at the connector.
By way of Google tonight, I found out about a loopback-test, which is claimed to check-out RS232 operations; it uses a loopback-connector (that I could make) but I didn't find any code to use for the loopback-test. I imagine the coding can't be very involved. Any help out there for that?
73 Jerry KM3K
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