A 10-Port Protocol Gateway enables data transfer between serial and Ethernet protocols. An ISA slot allows additional driver cards. An extensive library of drivers provides easy interoperability between a variety of devices used in building automation, HVAC, fire and process control industries. The Protocol Gateway enables devices using one protocol to communicate with devices using another protocol. An example is a fire alarm panel using a proprietary manufacturer's protocol needing to supply alarm information to a building automation system. In a single, comprehensive package the Protocol Gateway provides the hardware and software necessary for this translation. The Protocol Gateway includes eight RS-232 ports, two RS-485 ports, two Ethernet (10baseT) ports to interface to the devices. In addition there is an ISA card slot for special driver adapter cards such as DH+, Profibus, DeviceNet, LonWorks, ControlNet and more. All the necessary software and instructions for configuration are supplied with the Protocol Gateway.