Some devices will only connect to your computer using a port called 'RS232 Serial Port'. This port was used on old computers before 2003.
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RS232 was the universal/popular port back in the old days just like USB is today.
All current software, firmware, and drivers for the Surface Pro 3; including optional WinTab drivers. Links to drivers for other Surface devices are in the Details section below. If the device is removable, remove the device and then disable/enable from device manager to recover. I have performed the following steps so far to troubleshoot the problem: 1. Attempted to update the driver by 'Searching automatically for updated driver software' but 'Windows has determined the driver software for my device is up to date. After 3 days of digging, I found the fix for the OptiPlex 790 and 990 PCI Serial Port Driver issue which shows as a yellow triangle under Device Manager. This trouble occurs when you upgrade from Win 7 which is fully-supported by Dell on these machines, to the unsupported Win 8 or Win 10.
In short, all you need to know is...
Modern computers no longer have RS232 port (extinct just like VGA port is). So all you need to get is a RS232-to-USB converter. It's about $5 on eBay. Just search for: rs232 usb
When you buy it, you'll need to install it to Windows-based computer. Here's how...
Connect RS232 device into any USB port on your laptop/computer. Allow 20+- seconds for Windows to attempt to install drivers automatically.
If it's successful, skip to Step 2 below.
However in 95% of cases, it will fail to automatically install the drivers. So you have to install drivers manually.
1) Disconnect RS232 device from your computer.
2) Install both driver packs below...
- Driver Pack 1
- Driver Pack 2
- Driver Pack 3
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3) Restart your computer.
4) Connect RS232 device into any USB port. This time Windows will auto-install the drivers. You can verify a correct install going to Device Manager. Here's how...
Control Panel » System » Device Manager
Control Panel » System » 'Hardware' tab » Device Manager
You should see something like this:
If install STILL failed to install the drivers or above 'Prolific...' device has a yellow triangle next to it, then: Install the driver file from the disc that came with the RS232 Device.
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Verify RS232 device is connected to COM PORT number between 1 to 4. This is a MUST, else it will not work.
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Here's how to do this...
Right-click on 'Prolific...' device in Device Manager and click on 'Properties'. As seen below.
It's now working 100% as it should.