Anybus® Communicator Serial Gateways HMS Networks Anybus® Communicator Serial Gateways enable existing devices to be connected to an industrial PLC control system without hardware changes or programming. The Anybus® Communicator Serial gateways exchange data between a serial sub-network and higher-level networks, including EtherCAT, PROFIBUS, ControlNet, Modbus-RTU, Modbus-TCP, PROFINET, PROFINET IRT, EtherNet/IP, DeviceNet, CC-Link, and CANopen. The gateways issue serial telegrams cyclically, based on changes of state or trigger events given by the control system in the higher-level network (i.e., the Fieldbus master or PLC).