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1-2. Modbus protocol
Communication on a Modbus network is initiated by a master with a query to a slave.
After receiving and processing the query, the slave returns a reply to the master. The
master can address individual slaves or uses a special broadcast address (0x00) to
initiate a broadcast message to all slaves. No response is returned to broadcast
requests.
The AD only supports Modbus RTU. ASCII mode is not supported.. A Modbus register
is always 2 bytes of data (MSB first) even if the command table in chapter 4 specifies
only 1 byte (# bytes column). In this case, MSB byte will always be 0.
1-3. Modbus Physical Communication
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