Abstract: This paper studies and designs an embedded industrial monitoring network controller. First, the selection of hardware components and the overall hardware framework were completed, along with the driver design. Then, the software design for the controller's Ethernet access was carried out. The focus is on the functional implementation of the network layer and the corresponding detection module. This design features low cost, high performance, and versatility. Keywords: Ethernet; Embedded; Industrial monitoring 1. Introduction With the development of information technology, buildings, factories, and even homes are increasingly installing Ethernet to share information. These general-purpose Ethernet networks are flexible, convenient, and inexpensive, and naturally integrate with the Internet. If these networks can be directly used to connect field devices to achieve information sharing in control aspects in situations where real-time performance and environmental requirements are not special, remote monitoring can be easily achieved and costs can be greatly reduced. 2. Hardware Implementation of Embedded Interface Control Module 2.1 Introduction to ATmega128 and RTL8019AS Network Card Chips ATmega128 is a low-power CMOS 8-bit microcontroller based on an AVR RISC architecture launched by Atmel. By executing one instruction in one clock cycle, the ATmega128 can achieve a performance of 1 MIPS/MHz, allowing designers to achieve a balance between power consumption and execution speed. The main performance of the RTL8019AS network card chip [1]: 1) Compatible with Ethernet II, IEEE 802.3, 1OBaseS, 1OBase2, and 1OBaseT; 2) Supports 8-bit and 16-bit data buses; 3) Full-duplex, with simultaneous transmission and reception speeds of up to 10 Mbps, and a sleep mode to reduce power consumption; 4) Built-in 16KB SRAM for transmission and reception buffers, reducing the speed requirements of the main processor; 5) Can connect to coaxial cables and twisted pairs, and can automatically detect the connected media; 6) 100-pin TQFP package, reducing PCB size. 2.2 Introduction to the overall framework This project adopts the ATmega128[2] microcontroller based on RISC structure, which has on-chip FLASH program memory, and has in-system programming and debugging functions. It adopts CPU parallel pipeline mode and single clock cycle instruction. All I/O pins can be flexibly configured through programming. The network control module adopts a multi-tasking mode. While the microcontroller is performing data acquisition or completing I/O control tasks, it can also complete Internet protocol processing. At the application layer, the HTTP protocol is used as the communication protocol between the microcontroller system and the Internet remote management terminal. The Ethernet control chip 8019AS[3] is used, which can send data packets to the Ethernet and access the Internet through the Ethernet to realize a true embedded TCP/IP device. For details, please click: Research on embedded industrial monitoring network controller