M9781 is a part of Microtran, an industrial networking system designed for use in industrial automation operations. It provides a communications platform for connecting a variety of automation and process control systems, allowing them to communicate data and status information between systems. The M9781 is a serial port server designed to provide an RS-232/422/485 port over Ethernet. It also provides an RJ45 connector, allowing connection to several automation networks, as well as RS-232/422/485 ports, allowing connection to legacy automation systems. The M9781 is a cost-effective solution for connecting multiple automation systems, and its small form factor makes it ideal for installation in even the most cramped production areas.