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Message: <blockquote data-quote="jarance" data-source="post: 448561" data-attributes="member: 21">Aidil, I think scott would be a better person to answer you.My experience with RS-485 is based on industrial standard. Normally, we have a delicate module based on peer to peer communication. Usually, there should be only 1 master and many slaves. If there are 2 or more masters, then there would be collision alarm. The slaves would not know who to response when both master ask for information from the same slave address.btw, 9600 bauds rate is very slow. We usually use 19,800 bauds rate minimum.scott, your input is highly appreciate.btw, I look at the protocol coding  between modbus and I-Bus, the hex coding is quite similar.</blockquote>