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Picaxe Sertxd

I recently was given an irobot create and I am having trouble with coding it to send the specific commans via Sertxd

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This is a iRobot create with a picaxe onboard? You have a picaxe and you want it to talk to a iRobot? You are trying to get a picaxe to talk to a computer or computer to picaxe? What pins are you using? Is it an inverted tx problem? What is a "command"? How is it wired?

More please.