CH9121 UART to Ethernet Converter Module with TCP/IP Protocol Stack

CH9121 UART to Ethernet Converter Module with TCP/IP Protocol Stack
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  • Product Code:SQ8961
  • Availability: 1000
  • $24.55
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Tags: CH9121, UART to Ethernet, serial to Ethernet module, TCP IP converter, RJ45 module, WCH CH9121, network serial module, transparent transmission, industrial IoT, 10/100M Ethernet

The CH9121 Ethernet module is a UART to RJ45 network converter module built around the CH9121 network serial transparent transmission chip from WCH. It integrates a 10/100M Ethernet MAC and PHY transceiver fully compliant with the IEEE 802.3 protocol, and includes a built-in TCP/IP protocol stack that enables bidirectional transparent transmission between network data packets and serial data. This serial to Ethernet module supports four working modes — TCP Client, TCP Server, UDP Client, and UDP Server — allowing flexible integration into a wide range of networking applications.

The module supports a serial baud rate range of 300bps to 921600bps, with 5, 6, 7, or 8 data bits and 1 or 2 stop bits. It operates on a wide supply voltage range of 3.3V or 5V (selectable), and its I/O pins support 3.3V, 2.5V, and 1.8V voltage standards for compatibility with various microcontrollers. The CH9121 chip features dual independent UART ports with independent transparent transmission, and supports full-duplex and half-duplex communication with RS485 automatic TX/RX switching. The module also supports MDI/MDIX auto-crossover for simplified network cabling.

With built-in DHCP for automatic IP address acquisition and DNS domain name support, this UART to Ethernet converter can be easily configured via host PC software or serial commands without any microcontroller programming. It supports 0 to 2000 ms serial port timeout settings, keep-alive mechanism, and provides LED status indicators for link and activity states. This module is ideal for industrial control systems, embedded boards, equipment networking, and IoT applications requiring reliable serial-to-network data conversion.

CH9121 RJ45 UART module Application

  1. Industrial control systems
  2. Embedded boards and development platforms
  3. Equipment and machine networking
  4. IoT and smart device connectivity
  5. Data acquisition and remote monitoring
  6. Serial device network integration
  7. Automation and SCADA systems
  8. Virtual COM port communication

CH9121 RJ45 UART module Specifications

  1. Product Model: Ethernet CH9121
  2. Chip / IC: CH9121 (WCH)
  3. Module Type: UART to RJ45 Ethernet converter
  4. Ethernet Standards: 10BASE-T, 100BASE-TX (IEEE 802.3 compliant)
  5. Integrated PHY: Yes
  6. Integrated MAC: Yes
  7. Supported Protocols: TCP, UDP, ICMP, IPv4, ARP, IGMP, DHCP, DNS
  8. Working Modes: TCP Client, TCP Server, UDP Client, UDP Server
  9. Supply Voltage: 3.3V or 5V (selectable)
  10. I/O Voltage Support: 3.3V, 2.5V, 1.8V
  11. Operating Current: ~170mA (typical)
  12. Serial Baud Rate: 300bps to 921600bps
  13. Data Bits: 5, 6, 7, 8
  14. Stop Bits: 1, 2
  15. Parity: Odd, Even, None, Space 0, Mark 1
  16. Number of UART Ports: 2 (dual independent UART)
  17. UART Communication: Full-duplex and half-duplex
  18. RS485 Support: Automatic TX/RX switching
  19. MDI/MDIX: Automatic crossover
  20. Configuration: Host PC software or serial commands
  21. Virtual COM Port: Supported (PC software provided)
  22. Timeout Setting: 0 to 2000 ms
  23. LED Indicators: Link and ACT status
  24. Keep-Alive Mechanism: Supported
  25. Operating Temperature: -40°C to +85°C
  26. Package: LQFP-64M (10×10mm)
  27. Module Dimensions: 53mm × 22mm

Features

  1. UART to RJ45 Ethernet network conversion module
  2. Built-in 10/100M Ethernet MAC and PHY transceiver
  3. Integrated TCP/IP protocol stack (TCP, UDP, ICMP, IPv4, ARP, IGMP)
  4. Supports TCP Client, TCP Server, UDP Client, and UDP Server working modes
  5. Serial baud rate range from 300bps to 921600bps
  6. Dual independent UART ports with independent transparent transmission
  7. Full-duplex and half-duplex UART communication
  8. RS485 automatic TX/RX switching support
  9. MDI/MDIX automatic crossover
  10. DHCP automatic IP address acquisition
  11. DNS domain name system support
  12. Configuration via host PC software or serial commands
  13. Virtual COM port software for PC
  14. LED indicators for Link and ACT status
  15. Keep-alive mechanism support
  16. Wide supply voltage: 3.3V or 5V (selectable)
  17. I/O voltage support: 3.3V, 2.5V, 1.8V
  18. Operating temperature range: -40°C to +85°C
Electrical Parameters
Baudrate 10/100Mbps (Ethernet) , 300bps ~ 921600bps (Serial)
Input Voltage 3.3V , 5V
Power Consumption 1W
Board Parameters
Main Chip CH9121
Pin Count 16 Pin
Ports RJ45 , TTL
Physical Parameters
Size 43mm x 23mm x 14.5mm
Environmental Conditions and Safety
Operating Temprature -40℃ ~ 80℃
Storage temprature -55℃ ~ 125℃

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