Anybus® Serial Server Modbus RTU-to-TCP Gateway HMS Networks Anybus® Serial Server Modbus RTU-to-TCP Gateway allows Modbus RTU devices to be connected to a Modbus TCP network. The gateway functions as a Modbus TCP server and performs a transparent conversion between the two protocols. All Modbus accesses not addressed to the virtual slave of the gateway forwards to the Modbus RTU network. The maximum usable frame length (the number of registers) is limited only by the Modbus specification and the functionality of the connected Modbus RTU devices. All Modbus function codes are supported. A built-in web interface handles configuration while the Anybus IPconfig utility sets the gateway's IP address.