Equipped with Ethernet, RS-232, and 4 RS-485 ports, MDC-714 performs up to 200 Modbus RTU commands to read and write from/to Modbus slave devices via RS-232/RS-485. Unit also allows up to 8 Modbus TCP masters to retrieve polled data via Ethernet. While built-in web server lets users configure and see results of each Modbus RTU command, internal shared memory has 4 tables to store polled AI, AO, DI, and DO data. Each table stores up to 4,000 registers.