Atmega328p-pu board + rs485

A hardware prototype of a control module has been developed based on the AVR ATmega328P-PU microcontroller with an integrated RS-485 industrial communication interface. The device is assembled using through-hole mounting on a perforated breadboard. The circuitry of the board includes the basic connections of the microcontroller using an external quartz crystal oscillator to ensure stable system clocking. To implement half-duplex data exchange over the RS-485 differential bus, the appropriate MAX485EPA+ chip transceiver has been installed and wired. The board also includes pin headers for convenient connection of external peripherals, power lines, and provides the capability to upload firmware via the SPI interface. Along with the transmission of differential signals through a twisted pair, the board supports PoE.