Jinx clear.net.nz> writes: > Peter, if you tried to do it commercially I'm sure you'd be stepping > on someone's (lawyer's) toes. And they'd let you know all about it > > The protocol itself might be easily doable but finding an application > that's untouched by prior art paperwork could be tricky. But where > there's a will ..... I do not want to copy any protocol, I wish however, that more people would realize that it is in their interest (also commercially) to support OPEN protocols, such that they can create relatively small and low cost products and have a market for them even if they are not multi billion dilbertized cubicle farms who can afford to send all those corporate lawyer's offspring to ivy league colleges. 125 kHz is one of the legitimate and well known RFID frequencies so there is no rocket science involved, not even feng shui, but RF propagation around steel girder buildings filled with steel cabinets and wiring (and thermopane windows which attenuate a lot at 2.4GHz) *MAY* involve some feng shui to get things to work as expected (I can confirm this personally to a certain extent). As to protocols, it's all about how open it is, how (in)secure it is and how (un)reliable it is when stressed a little (think X10 problems). So I just asked in case someone else on this list discovered the protocol and did something with it with PICs. Apparently not (or they are keeping quiet). For my (open) purposes it's the same thing. I conclude that it is not used at all as an open protocol or system by any of the responders on this list. Peter -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist