EPS, also called emergency power supply, is an emergency power supply for emergency lighting, accident lighting, and fire lighting. Each functional module includes an input/output unit, a charging module, a battery pack, an inverter, a monitoring module, and an output switch. Device. Its working principle is that when the city power is normal, the city power supply is used, and the emergency power supply is used when there is no supply of the city power or the utility power is abnormal.
Since the emergency power supply is used for emergency power at emergency time, the emergency power supply needs to be in a usable state at all times, so the emergency power supply system is generally equipped with a monitoring module to monitor the operation of the power supply at any time. Related repairs. The current monitoring module communicates with the computer through the RS-485 bus. The computer reads the status of the emergency power supply in real time through the RS-485 bus, and sends relevant instructions to control the emergency power supply and self-check according to the state of the emergency power supply. instruction.
The building emergency power supply system is to provide power supply elevators and emergency lighting systems for the buildings in the event of an abnormal city power supply. Because of the scattered distribution of equipment requiring power supply, especially the emergency lighting system, emergency lighting, emergency escape lights must be Distribution in each corridor, so that the distribution of the emergency power supply is relatively scattered, and the 485 bus need to hand in hand wiring, if you use hand-to-hand wiring, the layout of the wire will need to go through all the emergency power, the wiring is complex and waste Seriously, there is still a bus. Once a problem occurs, all devices cannot communicate. Finding faults is also very troublesome.
The 485 hub of Shenzhen Dingxin Hongda Technology Co., Ltd. can be used to change the bus type wiring of the 485 bus to the star type wiring mode. The RS-232 serial port is directly connected to the computer, and multiplex 485 bus lines are provided downward to expand. Multiple 485 buses are connected to the emergency power supply. Because the 485 expander adopts optical isolation, port independent drive function, port failure intelligent alarm function, and a bus problem, the 485 expander will intelligently cut off its connection with other buses, and at the same time the indicator light A red alarm indicates that the bus has failed. The adoption of the 485 expander ensures the stability of the emergency power supply system communication. 
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