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Old 05-21-2008, 12:00 PM   #159 (permalink)
dcb
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I don't know for sure, but typically the chips talk ttl. The extra resistors and transistor and diode make it look like rs232 in that circuit. And with an arduino right there, you can probably just use ttl @ 9600 baud (though you probably have to unhook things to program the duino).

Are you going rx to tx, tx to rx in your connection?
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