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We are planning to use Ethernet to network Power Measurement Ltd. (PML) digital power meters to our Plant Information (PI) System data servers. Since the PML meter Ethernet port will be used for another protocol (ION), we are planning to use a Lantronix Modbus to Ethernet Bridge to convert the PML's serial port Modbus RTU to Modbus/TCP on Ethernet. The PML meter also has the option of assigning the Ethernet port to use the Modbus RTU protocol. We have been told that the PI system's "Modbus Ethernet" interface supports two "flavors" of Modbus over Ethernet:
1) Modbus RTU over Ethernet "wrapped in TCP/IP"
2) Modbus/TCP We have tested and confirmed this.
Is there a difference between Modbus RTU over Ethernet and Modbus/TCP? Can any Modbus/TCP master get data from a Modbus RTU Ethernet slave?.
1) Modbus RTU over Ethernet "wrapped in TCP/IP"
2) Modbus/TCP We have tested and confirmed this.
Is there a difference between Modbus RTU over Ethernet and Modbus/TCP? Can any Modbus/TCP master get data from a Modbus RTU Ethernet slave?.