Writing: the communication is between the master and a single slave.It allows reading information about the queried counter Reading: the communication is between the master and a single slave.Specifically, it covers the use of MODBUS messaging in an “Intranet” or “Internet” environment using the TCP/IP protocol on a fixed port 502. ![]() In this way, the communication messages move on a single line in two opposite directions.Īdditional Information MODBUS TCP is a variant of the MODBUS family. The protocol uses a simplex connection on a single line. Key Points MODBUS ASCII/RTU is a master-slave communication protocol, able to support up to 247 slaves connected in a bus or a star network. ![]() Network of Communication protocol is formed by one master and 247 slaves with a unique address.
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