USB to RS232 Adapter and Driver Advise - Heeeeelllllllpppppp Please!!

Hi All,
Can someone please help me with an issue im having.
I currently have a hl-340 usb to rs232 adapter for me to be able to Console on to cisco equipment (as i am a network engineer).
I can not get this to work!! i have installed the pl2303 driver as recommended by the place who sold this to me on ebay which has not worked, i have looked around and saw the option of installing the keyspan for this product USA-19HS but with no joy.
I need to get this working ASAP or look to purchase a new one. I am based in the UK so if it is not possible to get this working then can you advise on what one will work?
I am a novice to the Mac so any assistance you can all give will be greatly received.
Thanks

Let's figure out what you have first. Plug in you RS-232 adapter. If the system has a driver that recognizes it, it should pop up a window about detecting a new network interface. If that happens, your USB device is recognized and should be working. If not, you may have the wrong driver loaded.
In any case, open the System Profiler application (click the Apple logo in the menu bar, then About This Mac, then More Info). When the app opens, click USB (under the Hardware heading) in the left window pane. This will reveal all detected USB buses, hubs, and devices. On my system, my RS-232 adapter shows up as USB-Serial Controller. Clicking on it shows these details in the bottom pane:
USB-Serial Controller:
Product ID: 0x4026
Vendor ID: 0x1453
Version: 3.00
Speed: Up to 12 Mb/sec
Manufacturer: Prolific Technology Inc.
Location ID: 0xfd323000
Current Available (mA): 500
Current Required (mA): 100
Your details may be different, especially the Product and Vendor ID. For the PL2303 driver to work, I think the important part is that the Manufacturer is Prolific Technology. If it's something else, you may need a different driver. Try to find your device, and reply back with its details.
With the adapter still connected, click Extensions (under the Software heading) in the left window pane. A list of all kernel extensions will be displayed. This will take a while.
On my system, with the driver that I recommended, the extension name is osx-pl2303. Clicking on it shows these details in the bottom pane:
osx-pl2303:
Version: 1.0.0d1
Last Modified: 05/27/06 11:49
Kind: Universal
Architectures: i386, ppc
64-Bit (Intel): No
Location: /System/Library/Extensions/osx-pl2303.kext
Kext Version: 1.0.0d1
Load Address: 0x3599e000
Valid: Yes
Authentic: Yes
Dependencies: Satisfied
If yours also displays this, then your device should be working. If so, then you'll need to figure out how to get your software to recognize it. Reply back with whatever details you find.

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