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some questions on modbus

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ajrox

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I have some questions for modbus protocol.(rtu format)
  1. What are the start and stop bits for each byte that have to be appended?(modbus documentation does not mention this)
  2. Do all the bytes that have to be transmitted(namely-address byte,function byte,data bytes and crc bytes) have start,stop & parity bits?
  3. Is the baud rate for a particular network in modbus fixed?(9600 or 19200)
  4. What is the difference between coil and register in modbus terminology?
 

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