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Everything you need to know is in this post
it's long but will sort your problem out & all the questions asked has been answered one way or another.....
If you get stuck on anything ...i'm sure other members will help you out
Instead of being wired pin for pin (1-1, 2-2, 3-3 etc.) as in a standard serial cable, the tx & rx pins are crossed over so that pin2 > pin 3, & pin3 > pin2.
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