6 Replies Latest reply on Jan 30, 2017 8:27 PM by COMPACT

    How is this RS485 module working?


      I am using an RS485 module :- http://www.elecrow.com/uart-ttl-to-rs485-twoway-converter-p-1545.html

      This module is bidirectional and uses a single pair of differential signal to transmit/receive data. My question is how is the chip deciding whether it has to transmit data from TX to A+ B- or from A+ B- to RX?. Shouldn't there be 2 pairs of differential signal, one pair for TX and the other pair for RX? What is happening in this module??