MODBUS-GW.txt The Modbus Gateway provides a communication link between networks that use the Modbus/TCP communication protocol and Fire Alarm Control Panels (FACPs) resident on an NFN network. The NFN network communicates with the Modbus Gateway through a NOTI-FIRE-NET network via the network port on any NCM. The Modbus communication protocol is consistent with Modbus Application Protocol Specification V1.1b. The Modbus Gateway Configuration Tool, a programming utility included with the Modbus Gateway assembly, is used to configure the Modbus Gateway. The Modbus Gateway is designed to need very little configuration.