Gateway products ICP-DAS products Industrial Communication Serial Communication Gateway PPDS-700-MTCP Modbus Gateway – tGW Modbus Gateway The tGW-700/GW-2200i module is a Modbus gateway that enables a Modbus TCP/UDP host to communicate with serial Modbus RTU/ASCII devices through an Ethernet network. GW-2200 Modbus Gateway – uPAC-7186/I-7188 Modbus Gateway The Modbus communications protocol is now the most commonly available means of connecting industrial electronic devices. Fieldbus Gateway – GW-2500 Modbus Security Gateway GW-2500iM series is Modbus TCP to Modbus RTU/ASCII security gateway.