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CH9121 Serial Port To Ethernet Converter Module
Seamlessly bridge your serial devices to Ethernet networks with the CH9121 Serial Port to Ethernet Converter Module. Built around the powerful WCH CH9121 chip, this compact module enables transparent bidirectional data conversion between UART (TTL) serial ports and 10/100M Ethernet - ideal for remote monitoring, industrial automation, and IoT connectivity. Available now at The Engineer Store, Bengaluru, India.
Specifications
| Chip | WCH CH9121 |
| Function | Serial (UART TTL) to Ethernet Bidirectional Converter |
| Ethernet Standard | 10/100M Base-T (RJ45 with integrated transformer) |
| Serial Interface | Dual UART (TTL level, 3.3V) |
| Baud Rate Support | 300 bps to 921,600 bps |
| Network Protocols | TCP/IP, UDP, DHCP, ARP, ICMP, MAC RAW |
| Working Modes | TCP Server, TCP Client, UDP Server, UDP Client |
| Operating Voltage | 3.3V DC (onboard 5V to 3.3V regulator available on some variants) |
| Operating Temperature | -40 degreesC to 85 degreesC (Industrial Grade) |
| Dimensions | Compact module form factor |
| Configuration | Via serial AT commands or PC configuration tool |
| Type | Networking / Communication Converter Module |
| Origin | Original / Authentic |
| Warranty | 7-day warranty on manufacturing defects |
| Support | Email & WhatsApp 24/7 |
Key Features
- Dual UART Channels: Supports two independent serial ports for simultaneous communication with multiple devices.
- 10/100M Ethernet: Integrated RJ45 port with built-in transformer for reliable, high-speed wired network connectivity.
- Flexible Working Modes: Operates as TCP Server, TCP Client, UDP Server, or UDP Client to suit diverse networking topologies.
- Transparent Transmission: Passes data transparently between serial and Ethernet without requiring protocol changes on your existing serial devices.
- Wide Baud Rate Range: Configurable from 300 bps up to 921,600 bps to match virtually any serial device.
- Easy Configuration: Set up via simple serial AT commands or the free WCH PC-based configuration utility - no complex coding required.
- Industrial-Grade Temperature Range: Rated from -40 degreesC to 85 degreesC, ensuring reliable operation in harsh environments.
- DHCP & Static IP: Supports both automatic IP assignment and static IP configuration for flexible network deployment.
- Compact Form Factor: Small footprint makes it easy to embed into existing enclosures and custom PCB designs.
- Low Power Consumption: Energy-efficient design suitable for always-on applications and remote installations.
Why Choose The CH9121 Module from The Engineer Store?
- 100% authentic CH9121 modules sourced directly from trusted and authorized suppliers.
- 1-5 day shipping, 7-8 day delivery across India from our Bengaluru warehouse.
- Expert technical support to help you with wiring, configuration, AT commands, and network setup.
- Competitive pricing at just Rs.585 - exceptional value for a full-featured serial-to-Ethernet solution.
- Trusted by thousands of makers, engineers, and professionals across India.
Project Ideas
- Remote Industrial Monitoring: Connect legacy serial sensors, PLCs, or meters to your local network or cloud dashboard for real-time remote monitoring and data logging.
- IoT Gateway: Use the CH9121 as a bridge to bring UART-based microcontrollers (Arduino, STM32, ESP32) onto a wired Ethernet network for stable, low-latency IoT communication.
- Serial Device Server: Convert RS232/TTL serial instruments (barcode scanners, weighing scales, GPS modules) into network-accessible devices shared across multiple computers.
- Home Automation Hub: Network-enable serial-controlled relays, dimmers, and actuators for centralized smart home control over Ethernet.
- Multi-Node Data Acquisition: Deploy multiple CH9121 modules across a facility to collect serial data from distributed sensors and aggregate it on a central server via Ethernet.
- Learning & Education: An excellent hands-on module for students learning about TCP/IP networking, UART communication, embedded systems, and network protocol fundamentals.
- Point-of-Sale (POS) Integration: Connect serial receipt printers, cash drawers, and display poles to modern Ethernet-based POS systems without expensive hardware upgrades.
How It Works
- Step 1 - Connect: Wire your serial (UART TTL) device to the CH9121's TX/R
Frequently Asked Questions
When will I receive my order?
Products ship within 1-5 days from our Bengaluru warehouse. Delivery within 7-8 days to most locations across India.
Is technical support available?
Yes, 24/7 support via email and WhatsApp for setup, troubleshooting, and application guidance.
What is your return policy?
7-day returns on manufacturing defects only. Full refund or replacement. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing on orders of 10+ units. Contact us via WhatsApp or email for a custom quote.
Buy CH9121 Serial Port To Ethernet Converter Module Online in India
Purchase the CH9121 Serial Port To Ethernet Converter Module online at The Engineer Store - India's most trusted electronics components store. We deliver across all major cities including Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on CH9121 Serial Port To Ethernet Converter Module with fast 1-5 day shipping from our Bengaluru warehouse. All products are 100% authentic, sourced from authorized distributors with 7-day warranty on manufacturing defects.
Looking to buy CH9121 Serial Port To Ethernet Converter Module at the best price in India? The Engineer Store offers competitive pricing, bulk discounts for orders of 10+ units, and dedicated technical support via email and WhatsApp. Whether you are a hobbyist, student, or professional engineer, we have everything you need for your electronics projects.
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CH9121 Serial Port To Ethernet Converter Module
Seamlessly bridge your serial devices to Ethernet networks with the CH9121 Serial Port to Ethernet Converter Module. Built around the powerful WCH CH9121 chip, this compact module enables transparent bidirectional data conversion between UART (TTL) serial ports and 10/100M Ethernet - ideal for remote monitoring, industrial automation, and IoT connectivity. Available now at The Engineer Store, Bengaluru, India.
Specifications
| Chip | WCH CH9121 |
| Function | Serial (UART TTL) to Ethernet Bidirectional Converter |
| Ethernet Standard | 10/100M Base-T (RJ45 with integrated transformer) |
| Serial Interface | Dual UART (TTL level, 3.3V) |
| Baud Rate Support | 300 bps to 921,600 bps |
| Network Protocols | TCP/IP, UDP, DHCP, ARP, ICMP, MAC RAW |
| Working Modes | TCP Server, TCP Client, UDP Server, UDP Client |
| Operating Voltage | 3.3V DC (onboard 5V to 3.3V regulator available on some variants) |
| Operating Temperature | -40 degreesC to 85 degreesC (Industrial Grade) |
| Dimensions | Compact module form factor |
| Configuration | Via serial AT commands or PC configuration tool |
| Type | Networking / Communication Converter Module |
| Origin | Original / Authentic |
| Warranty | 7-day warranty on manufacturing defects |
| Support | Email & WhatsApp 24/7 |
Key Features
- Dual UART Channels: Supports two independent serial ports for simultaneous communication with multiple devices.
- 10/100M Ethernet: Integrated RJ45 port with built-in transformer for reliable, high-speed wired network connectivity.
- Flexible Working Modes: Operates as TCP Server, TCP Client, UDP Server, or UDP Client to suit diverse networking topologies.
- Transparent Transmission: Passes data transparently between serial and Ethernet without requiring protocol changes on your existing serial devices.
- Wide Baud Rate Range: Configurable from 300 bps up to 921,600 bps to match virtually any serial device.
- Easy Configuration: Set up via simple serial AT commands or the free WCH PC-based configuration utility - no complex coding required.
- Industrial-Grade Temperature Range: Rated from -40 degreesC to 85 degreesC, ensuring reliable operation in harsh environments.
- DHCP & Static IP: Supports both automatic IP assignment and static IP configuration for flexible network deployment.
- Compact Form Factor: Small footprint makes it easy to embed into existing enclosures and custom PCB designs.
- Low Power Consumption: Energy-efficient design suitable for always-on applications and remote installations.
Why Choose The CH9121 Module from The Engineer Store?
- 100% authentic CH9121 modules sourced directly from trusted and authorized suppliers.
- 1-5 day shipping, 7-8 day delivery across India from our Bengaluru warehouse.
- Expert technical support to help you with wiring, configuration, AT commands, and network setup.
- Competitive pricing at just Rs.585 - exceptional value for a full-featured serial-to-Ethernet solution.
- Trusted by thousands of makers, engineers, and professionals across India.
Project Ideas
- Remote Industrial Monitoring: Connect legacy serial sensors, PLCs, or meters to your local network or cloud dashboard for real-time remote monitoring and data logging.
- IoT Gateway: Use the CH9121 as a bridge to bring UART-based microcontrollers (Arduino, STM32, ESP32) onto a wired Ethernet network for stable, low-latency IoT communication.
- Serial Device Server: Convert RS232/TTL serial instruments (barcode scanners, weighing scales, GPS modules) into network-accessible devices shared across multiple computers.
- Home Automation Hub: Network-enable serial-controlled relays, dimmers, and actuators for centralized smart home control over Ethernet.
- Multi-Node Data Acquisition: Deploy multiple CH9121 modules across a facility to collect serial data from distributed sensors and aggregate it on a central server via Ethernet.
- Learning & Education: An excellent hands-on module for students learning about TCP/IP networking, UART communication, embedded systems, and network protocol fundamentals.
- Point-of-Sale (POS) Integration: Connect serial receipt printers, cash drawers, and display poles to modern Ethernet-based POS systems without expensive hardware upgrades.
How It Works
- Step 1 - Connect: Wire your serial (UART TTL) device to the CH9121's TX/R
Frequently Asked Questions
When will I receive my order?
Products ship within 1-5 days from our Bengaluru warehouse. Delivery within 7-8 days to most locations across India.
Is technical support available?
Yes, 24/7 support via email and WhatsApp for setup, troubleshooting, and application guidance.
What is your return policy?
7-day returns on manufacturing defects only. Full refund or replacement. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing on orders of 10+ units. Contact us via WhatsApp or email for a custom quote.
Buy CH9121 Serial Port To Ethernet Converter Module Online in India
Purchase the CH9121 Serial Port To Ethernet Converter Module online at The Engineer Store - India's most trusted electronics components store. We deliver across all major cities including Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on CH9121 Serial Port To Ethernet Converter Module with fast 1-5 day shipping from our Bengaluru warehouse. All products are 100% authentic, sourced from authorized distributors with 7-day warranty on manufacturing defects.
Looking to buy CH9121 Serial Port To Ethernet Converter Module at the best price in India? The Engineer Store offers competitive pricing, bulk discounts for orders of 10+ units, and dedicated technical support via email and WhatsApp. Whether you are a hobbyist, student, or professional engineer, we have everything you need for your electronics projects.