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Sylvain Munaut 246tnt at gmail.comHi, > then I have put a diode between TXD and RXD, then I have connected RXD to > I/O of phone sim slot, I'm not sure a diode would help here at all ... Usual solution is to have an open collector output with a pullup. Then you have all the issue where a phone could request change of speed via the special PPS procedure (IIRC) and I'm not sure you'd be able todetect and follow it. Adapting the fw of a simtrace board seems like a better solution. Cheers, Sylvain