RS485 Solar Charge Controller

MPPT2075-DCLi-485 is an MPPT boost constant current waterproof solar controller with RS485 communication function, mainly used in solar street light systems that require remote control.

RS485 is a standard that defines the electrical characteristics of drivers and receivers in balanced digital multipoint systems. Digital communication networks using this standard can efficiently transmit signals over long distances and in environments with high electronic noise. RS-485 makes it possible to configure inexpensive local networks and multi-drop communication links.

RS485 uses balanced transmission, i.e. differential transmission.

The transmission distance of RS-485 is several tens of meters to several kilometers.

The RS-485 interface allows up to 128 transceivers to be connected on the bus.

The RS-485 data signal uses a differential transmission method, also called balanced transmission. It uses a pair of twisted pairs, and one of the lines is defined as A, and the other line is defined as B. Normally, the transmission between the drivers A and B is positive. The level is from +2 to +6V, which is a logic state, and the negative level is -2 to 6V, which is another logic state. There is also a signal ground C, there is also an "enable" end in RS-485. The "Enable" terminal is used to control the disconnection and connection of the transmit driver and the transmission line. When the "enable" terminal is active, the transmit driver is in a high-impedance state, referred to as the "third state", i.e. it is the third state distinct from the logic "1" and "0". The receiver is also configured to be opposite to the transmitting end. The receiving and transmitting ends are connected to AA and BB through a balanced twisted pair. When there is a level greater than +200 mV between the receiving ends AB, the positive logic level is output, which is less than -200 mV. When, a negative logic level is output. The level of the receiver receiving balance line is usually between 200mV and 6V.

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