Thanks to everyone, but here I send you more details:

        The devices that will communicate, will nearly be in contact with each
other, and there will be no
external light interference at all.
        The reason to use infrared communication, is because both will be sealed
boxes, and there can=B4t be
a connector due to possible corrosion of metals.
        The speed should be 9600 or 19200 bauds.
        Any better solution (cheaper and safer) than an irda chipset ?

        Again, thanks to everyone who wrote answered......

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