Hi,

>>If I use the Transistors the receive side will be Ok but how will I transmit to the PC .

So, it is the comm between PC and the micro. It is absolutely possible, what I mentioned i.e. both RX and TX. I have done it and it works.

Search the internet you will find. For example, you can look at Peter Dannegger

http://www.specs.de/users/dan...schema.pdf

He has used FETs but same thing can be realised using BJTs.