I struggled for several days last year with the MS Ergo Keyboard 4000's USB connection -- trying to get it to work through a high-quality Raritan KVM switch (which has PS/2 connectors for mouse and keyboard, no USB), and finally gave up.
I *really* wanted to make it work, since I love many things about that keyboard, but I have to go through KVMs (and I already have a HUGE investment in the Raritan PS/2 equipment, so it would cost a small fortune to replace that with USB KVM equipment).
I thought that it should be possible to make it work -- especially because I have used many other USB keyboards and USB mice with my KVMs.
I tried many things including:
(1) Several different brands of the little USB-to-PS2 and PS2-to-USB convertor/adapters (these are the little green or purple ones, about 1.5" long that sell for about $3-4 US),
(2) Several of the more "upscale" USB-to-PS2 converter/adapters/splitters, such as the kind used for connecting keyboard and mouse to a laptop that has only one connector for external keyboard and mouse (these are about 6"-10" long, usually having a small nodule-thingie in the middle, with 1 cable about 3" on one side, and 2 cables about 3" long on the other side, and sell for about $10.00),
(3) Some high-end USB-to-PS2 converter/adapter/splitter/emulators, like the laptop converter/splitter described above, but additionally having electronics which emulate a mouse (so that, when using a KVM and you switch it from computer A to computer B, Computer A still thinks it has a mouse attached). (Since the USB connector on these is male, and the USB connector on the MS 4000 keyboard is male, you have to use a F-F gender changer between them). These sell for about $50-150.00.
(4) Praying
(5) Holding my breath and contorting my mouth into unusual shapes,
none of which worked.
I cannot understand WHY it is not possible to get this keyboard to work through USB-to-PS2 converters. I posted questions in a few online forums about this, but have never gotten any answers.
Since then, I have discovered that there are also a few USB mouses (both wired and wireless) made by Microsoft, which similarly do not work with the KVMs, converters/adapters, splitters/emulators. (But I have some earlier models of Microsoft USB mice which do work -- such as the Wireless Optical Mouse 2.0).
I have reluctantly resigned myself to the fact that the MS 4000 Ergo keyboard is not going to be possible for me with my KVM setups.
But -- still I would like to know the reason WHY?!?! What is Microsoft doing differently with their USB?
It appears to be yet another instance where Microsoft ignores well-established international standards, and designs things they way they think is "better", to hell with compatibility with the rest of the world's manufacturer's devices.
But, what is it that Microsoft is doing differently, which they apparently think is better than the USB standard? What are we gaining from this difference?
Microsoft won't answer this question. I've sent it to a few of the computer-tech magazines, but they don't seem to be sufficiently interested in the problem to provide an answer.
I would be most grateful if there is someone here who could enlighten us as to the "WHY" of this incompatibility.
Thanks!