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Difference between Serial and TTL communication

Hi,
I am trying to send data from one controller to another directly ie without converting it into serial.
Now when i send the data using 232 it is being received alright and the out put is also displayed.
i am using putchar and getchar.
but when i try this by directly connecting the Tx of first controller to Rx of next the data is either not being read properly or not being transfered properly. I'm just not getting what is going wrong. it should work i think i have even made the ground common for both the controllers.

Thanks
Ajay.

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