Question about Keyspan USB 4-Port Serial Adapter (USA-49WLC) Serial Adapter

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I have not been able to find a Driver for Windows 7 for the Keyspan USB adaptor model USA-49wlc

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Download this http://marc.oya.free.fr/fichiers/KeyspanUSA49wWinV31c.exe

they are not specifically designed for win 7 but they work fine

If you found this info useful please vote for me

Posted on Mar 26, 2011

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1 Answer

Keyspan's drivers won't work on Win7 . . . Install MS's Virtual PC. Add usbd.sys to windows/system32/drivers (virtual box doesn't think it needs to load the virtual usb drivers, so i


1. instal server utility on Windows 7
2. right click icon choose properties
3. select compatibility tab choose vista sp2
now run it and presto......

regards, dean

Jul 06, 2012 | Keyspan USB Server US-4A (d47710) Print...

1 Answer

For key span server to work with windows 7 install windows xp mode to windows 7 ( this can be downloaded from microsoft website if you have windows 7 pro and above. if you have windows 7 home then install...


1. instal server utility on Windows 7
2. right click icon choose properties
3. select compatibility tab choose your o/s
now run it and presto......

regards, dean

Jan 08, 2011 | Keyspan USB Server US-4A (d47710) Print...

2 Answers

I have window 7 64bit and the keyspan software installed fine but the server utility does not recognize the print server. I allowed port 3842 tcp and udp through the windows firewall but still no luck.


for key span server to work with windows 7 install windows xp mode to windows 7 ( this can be downloaded from microsoft website if you have windows 7 pro and above. if you have windows 7 home then install windows virtual pc, start it up and insert a windows xp pro install disk. for info on this google 'workaround to install windows xp mode in windows 7 home premium and home basic') Once you have windows xp mode running, install the keyspan server utility int he virtual machine and setup as usuall. then share the printer. go to windows 7 devices and printers and add a printer, chose a network printer, select the new virtual machine and select the shared printer. In order for the printer to work just start up the keyspan program from windows 7 and print....your welcome.

Sep 08, 2010 | Keyspan USB Server US-4A (d47710) Print...

2 Answers

I cannot find a driver or SW package for Windows 7.


Tripplite bought Keyspan and are no longer supporting it. there are no 64bit drivers.

May 15, 2010 | Keyspan USB Server US-4A (d47710) Print...

2 Answers

I cannot find a driver or SW package for Windows 7.


I have the same problem. This is what Tripp Lite told me: "We have tested the existing drivers for the US-4A on both Windows 7 and Mac OS 10.6.2. Neither Windows7 nor Mac OS 10.6.2 functioned with the USB server products (US-4A and U2S-2A) while utilizing current drivers. I suspect that this is due to the fact that both OS' appear to have undertaken a major overhaul over their prior counterparts (XP, Vista, 10.5.X). In order for functionality to exist between the operating systems (in this case Win 7 and Mac OS 10.6.X) new drivers would need to be released. At this point, there is no plan to move forward with drivers to accommodate these operating systems."

I told them I was not impressed and that this lack of support would affect any future purchases of thier products.

Mar 27, 2010 | Keyspan USB Server US-4A (d47710) Print...

1 Answer

I need a Vista driver for the USA-19QW Serial Adapter


I have an old 4-port Keyspan serial device that also doesn't work with Vista.  Unfortunately Keyspan didn't provide Vista drivers for some of the older USB to Serial devices before they were acquired by Tripp-Lite, so you will probably need to get a replacement (Keyspan usa-19hs has Vista support, that one works for me).  The support page for Keyspan USB devices is here: USB Connectivity & Device Servers

Apr 20, 2009 | Keyspan (USA-19QW) Serial Adapter

1 Answer

Keyspan usa-19qw


The qw is an older device that doesn't have Windows Vista support.  Assuming you are running Vista, you will need the HS version.  Here is a link to the current Keyspan USB support, verify Vista support before purchasing:  USB Connectivity & Device Servers

Feb 10, 2008 | Keyspan (USA-19QW) Serial Adapter

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