boot PC using KNX control - HOWTO?

I have not tried any of these options but I can suggest you some possible directions of research and even so it is, at a first sigth, only for the Wake on Lan functionality

1. KNX/USB interface and a Plug computer: If you don't know a plug computer these are vey low power comsumption Linux based computers (see http://www.plugcomputer.org/ or http://www.marvell.com/platforms/plug_computer/). There's already people that configured these Plug computers to control the KNX installation ( see http://www.plugcomputer.org/plugwiki/index.php/EIBD_KNX_Controller and http://plugcomputer.org/plugforum/index.php?topic=824.0 ). So here the Plug Computer could listen for your telegram on the KNX bus, via the usb interface, and then issue a Linux command that would trigger the Wake on Lan . For Linux commands that could do this see http://gsd.di.uminho.pt/jpo/software/wakeonlan/mini-howto/.

2. KNX/IP router and a Open Source IP Router: A KNX/IP router like the Weinzierl KNX IP Router 750 ( http://www.weinzierl.de/de/products/750.html to transfer the telegram from the KNX bus to the IP network and then a Linux open source IP router like NETGEAR RangeMax WNR3500L where you could modify the routing softare that, once the right telegram detected, would trigger the Linux command for the Wake on Lan.

3. KNX/USB interface and Open Source IP router with USB Port: A Router like the Linksys WRTSL54GS has a linux firmware and an USB port. The ideia behind this configuration is inline the previous ones. The router base software would have o be modified lo listen to the rigth letegram on the KNX bus and the issue a Linux command to trigger the Wake on Lan.

4. KNX IR signal emitter and IRtrans: This is not really rounting but you can also investigate the use of an IR signal emitter, like the Gira KNX IR transformer http://www.gira.com/en/produkte/instabus-ir-umsetzer.html and then IRTrans http://www.irtrans.de/en/shop/lan.php to receive that signal and issue the Wake on Lan command to the PC via Ethernet.

In theory any of these options can work but, depending of your knowledge of course, you will have to expect some level of development and trial and error. Have fun and let us know the results. No doubt that it is a very interesting ideia.

UPDATE 2010-08-30, EB

Since I'm getting the HTTP error 500 when I try to update my previous anwsers ( answers made before the website layout change) here's another tip for the Wake on LAN functionality triggered from the KNX world.

• eibPort from b.a.b Tech . The eibPort ( see http://www.bab-tec.de/english/products/hardware/eibport-version-2/) can act as a KNX/IP router and natively already includes the Wake-On-Lan functionality. We can read on its manual ( see http://www.bab-tec.de/fileadmin/Dateien/Dokumente/Bedienungsanleitungen_eP/Instructionsheet_EN_eP090_20100318.pdf) that it has a "Wake on Lan" job that can

  "awake" up to 8 PCs or other clients

From all the options I have already refered, including those on my previous anwser, this seems to me that it is the most simple one to implement. Maybe not the cheapest , at round about 1400.00 euro + tax, but if your time is money then it is something to consider.