The internal integrated TCP / IP protocol stack can realize two-way transparent transmission of network data packets and serial port data.

It has four working modes: TCP CLIENT, TCP SERVER, UDP CLIENT, and UDP SERVER.

The host computer software or serial command is easy to configure and convenient.

Chip Features:

  • Internal Ethernet media transport layer (MAC) and physical layer (PHY)
  • Realize two-way transparent transmission of serial data and network data
  • Support 10 / 100M, full duplex / half duplex adaptive Ethernet interface, compatible with 802.3 protocol
  • Support MDI / MDIX automatic conversion
  • Support DHCP to obtain IP address automatically, support DNS domain name access
  • Set the chip’s working mode, port, IP and other network parameters through host computer software and serial commands
  • Working mode supports TCP CLIENT, TCP SERVER and UDP CLIENT, UDP SERVER 4 modes
  • Supports up to two independent serial ports at the same time, independent transparent transmission
  • Serial baud rate supports 300bps to 921600bps
  • Serial TTL level, compatible with 3.3V and 5V
  • The serial port supports full-duplex and half-duplex serial port communication, and supports RS485 automatic switching
  • Support and provide virtual serial port software
  • Support KEEPALIVE mechanism

Board Features:

  • Board power supply 5V or GND
  • On Board RJ45 ethernet connector.
  • Pin Definitions:
    • RESET: Restore factory setting pins, module power-on detection, active low
    • DIR: RS485 receive and transmit switch control pin
    • TCPCS: TCP client mode, port connection status indicator pin, output low level after successful connection
    • RUN: module running status indication pin, input 2Hz square wave
    • GND: power ground pin
    • 3.3V: 3.3V DC power input pin, greater than 200mA, select one of 5V DC power
    • GND: power ground pin
    • 5V: 5V DC power input pin, more than 200mA, and either 3.3V DC power
    • RSTI: reset pin, internal pull-up, active low, floating if not needed
    • CFG: serial port configuration module enable pin, built-in pull-up, active low, can be left unconnected
    • RXD: serial data receiving pin, serial TTL level
    • TXD: serial data transmission pin, serial TTL level
  • Very compact PCB size 48 * 24 mm (not include the hang out of RJ45)
  • Two and two half installation holes.

Documentation of use guide please see GIF here. Config tool please find in our bitbucket wch_ch9121.

Additional information

Weight 0.015 kg


There are no reviews yet.

Be the first to review “Serial UART to Ethernet TCP UDP Module”

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Product Enquiry