Shahzad Aslam wrote:
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So here are my confusions and clarifications to confirm

- First that means that what ever is send will be received by all nodes in the line. I can assume that this is RS232 communication and I am sending and receiving bytes through RS232 software.

------Yes

- I have to write my own protocols so that a message can be transmit with a address to whom it should go and all nodes will receive that message and decide whether this is for them or not.

-------Yes

- Most important which I can not understand in the PDF circuit that how the collision is detected. I mean at one time only one node should be transmitting. So how the node will decide whether it can transmit or not.

collision detection?? use only one master in the network and let it instruct the slaves . I dont know your application but you can also opt for CAN bus etc .

have a look at bens site for 485 stuff.


Sanjeev