CH9121 Serial Port To Ethernet Converter Module
CH9121 Serial Port to Ethernet Converter Module
The CH9121 Serial Port to Ethernet Converter Module bridges serial devices to Ethernet networks. Built around the WCH CH9121 chip, it provides transparent bidirectional data conversion between UART (TTL) serial ports and 10/100M Ethernet. This module is designed for remote monitoring, industrial automation, and IoT connectivity projects.
Specifications
- Chip: WCH CH9121
- Interface: UART (TTL) to 10/100M Ethernet
- Serial port logic level: 3.3V / 5V tolerant
- Ethernet: 10/100Mbps, auto-negotiation
- Protocol: TCP/IP, UDP, ARP, ICMP, DHCP, DNS
- Operating modes: TCP Server, TCP Client, UDP, HTTP Client
- Configuration: Serial AT commands or web browser
- Power supply: 3.3V or 5V DC
- Dimensions: 25mm x 18mm
Compatible with
Arduino, ESP32, ESP8266, Raspberry Pi, STM32, and any microcontroller with a UART interface.
What you can build with it
- Remote sensor monitoring: Connect temperature, humidity, or pressure sensors to a serial port and stream data over Ethernet to a central server.
- Industrial device control: Control relays, motors, or actuators from a remote PC via Ethernet using simple serial commands.
- IoT gateway: Bridge multiple serial devices to a local network for cloud connectivity and data logging.
Built and Backed by Compoden
Every CH9121 module comes with access to our AI build companion, delivered via QR code, email, or WhatsApp, which helps you wire and program this part into a working project. With 10 years of experience supplying makers and institutions across India, we ensure reliable components and support. Pay your way: UPI, cards, or Cash on Delivery, anywhere in India.
What is the CH9121 Serial Port to Ethernet Converter Module used for?
It converts serial data from a UART device into Ethernet packets, allowing you to control or monitor serial devices over a network. Common uses include remote sensor monitoring, industrial automation, and IoT gateways.
How do I configure the CH9121 module?
You can configure it using serial AT commands via a terminal program or through a web browser when connected to the network. The module supports TCP Server, TCP Client, UDP, and HTTP Client modes.
What payment options are available for the CH9121 Serial Port to Ethernet Converter Module?
We accept UPI, credit/debit cards, and Cash on Delivery (COD), available across India.
How long does delivery take?
We ship the CH9121 module across India including Delhi, Mumbai, Bangalore, Hyderabad, Chennai, and Pune. Delivery typically takes 3-7 business days depending on your location.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items