Knowledge Base / Rockwell In-chassis / CompactLogix / MVI69 Series

What is the difference between the MVI69-MCM vs the MVI69-MNET?

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The MVI69-MCM module supports the Modbus protocol for standard serial connections (RS-232, RS-422, RS485) the MVI69-MNET module supports Modbus - TCP/IP. That is, Modbus embedded in the TCP/IP protocol over an EtherNet network.