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NO! The Basic Stamps (all variations including SX) only support 232. If you want to use the 422 modems, you will need to convert the 232 signal from the stamp to a valid 422. From what I've heard this can be done very easily but is somewhat expensive. Anyway, if you get regular 232 wireless modems (like the debugging ones), it should work just fine.
The commands you will need are:
shiftin/shiftout (syncronous I/O)
serin/serout (async I/O)
Note that any pins on the stamp can carry a 232 signal and any of the pins can be used for clocking.
--Rob
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