hello,
I'm using this one:
http://www.gefen.eu/lshop,showdetail,13103182335129,de,1310318243-5169,1271253059.1271252698,gtb-mhdmi1.3-441,7,Tshowrub--1271253059.1271252698,.htm
Don't know if this is the switch you mean. The RS232 is additional, it also works with IR and PUC is available.
hfat