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Serial communication questions

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Last Modified: 2013-11-13
hi,
I would like to find out more about serial communications, i have used them but i merely followed the instructions like which pin to which pin on the instructions manual. I would like to how the wiring works, why pin 2 to 3 and 3 to 2 etc and are the wiring a standard (same throughout for 232,422 and 485) what is half duplex and what is full duplex, where can i find wiring configurations for all the above and what is the handshaking for because i have never need to used it..most of the time i use rs232 and rs485 for matchine to computer interaction. What are the cables used for these because i have seen many type of cables in the market but i am always not sure which to get. thanks
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