The communication manager can also be called a protocol converter, which is to convert other intelligent system specifications into a protocol that can be recognized in the background, and then resolve it and display it on the back stage. General common access regulations are available, and the support of the electrical communication management machine is rich, including IEC101, IEC103, IEC104, CDT, iec 61850, modbus protocol, etc. Generally speaking, the regulation of access in the market is mostly standard statute, but still some manufacturers are not standard, some discrepancy, but generally no problem. In a system, the function of communication management machine is connected to the system of microcomputer protection device and other communications equipment, such as pressure transmitter, differential pressure transmitter, flow meter, liquid level meter, sensor, dc panel, meter, intelligent instrument, the small current grounding line selection, power quality monitoring devices and other equipment.