i am trying to design a microcontroller based fault detection system where a single receiver will receive any data from multiple transmitters. it is assumed that at a time only one transmitter will send the data. all microcontrollers belong to 8051 family, and have a 11.059MHz crystal. the baud rate is 9600bps. i have used max487 for the networking. now when a single transmitter is attached to the network, the receiver works. but when i add another transmitter (tot 2 transmitters & 1 receiver in the network), the receiver does not respond. i checked with logic probe that no data is reaching at rx pin of receiver. the number of transmitter will be upto 127. please suggest.
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