The Allen-Bradley 1770-KFD PLC-5 DeviceNet RS-232 Interface Communication Module provides a host computer access to a DeviceNet network. The module allows the user to communicate point-to-point, or via a DeviceNet network connection. The module performs data transmission, management, and local network diagnostics. The module can be powered from either an external power supply or from a DeviceNet network. The wiring key molded on the bottom of the 1770-KFD module connects the RS-232 cable to a computer. The module can connect to a DTE-controlled answer or auto-answer dial-up modem.