Transition to the Industrial Internet of Things (IIOT) will take many years before completion. Legacy systems need to be monitored, characterised and documented before replacement. The project will use the wiz610 to implement an rs485 "sniffer" to monitor legacy modbus messages. These will be converted, filtered and forwarded to the cloud as standard IIOT message types, available for Enterprise Processing. The legacy PLC commands can then be 'mirrored' before replacing the PLC control by cloud/edge based control.