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When I have a Master which to need to communicate with many slaves through the RXD,TXD pins, is it possible for the slaves to communicate with master independently. That is whenever the slave wants to do so. The reason why I asked is if there is an attempt by more than one slave to communicate with the Master at the same time, won't it cause a conflict? If so, how such situations to be handled?
there is, basically, two methods for multiple nodes a) master-slave which has collision avoidance because no slave speaks till granted permission. This is fairly simple. b) multi-master which must have collision detection because there is no way to avoid two nodes starting at the same time by 'listening'. This type must have retransmit capability and random start in case of collision. I have done both, but my absolute preference is collision avoidance whenever possible.
Erik