The standard for cabling devices together in a a network. All new computers come with with Ethernet, ; any reference to "'network," "' 'network ready ready," "' 'LAN," "LAN connection" or "network card" implies Ethernet. Ethernet uses ' 'LAN connection' or 'network card' implies Ethernet. Ethernet uses cables to connect devices. Many PLCs are connected through ethernetEthernet, meaning they can be connected directly to the the network and the and the OPC server can talk to it communicate without going through another device. A Serial serial-to-Ethernet converter converter (device) can be used on some older serial PLCs to make the them appear on the network as a normal ethernet PLC.the network as normal Ethernet PLCs. See also Network, LAN, Edge of Network Gateway.