{"product_id":"ch9121-serial-port-to-ethernet-converter-module-1","title":"CH9121 Serial Port To Ethernet Converter Module","description":"\u003ch1\u003eCH9121 Serial Port to Ethernet Converter Module\u003c\/h1\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eChip: WCH CH9121\u003c\/li\u003e\n\u003cli\u003eInterface: UART (TTL) to 10\/100M Ethernet\u003c\/li\u003e\n\u003cli\u003eSerial port logic level: 3.3V \/ 5V tolerant\u003c\/li\u003e\n\u003cli\u003eEthernet: 10\/100Mbps, auto-negotiation\u003c\/li\u003e\n\u003cli\u003eProtocol: TCP\/IP, UDP, ARP, ICMP, DHCP, DNS\u003c\/li\u003e\n\u003cli\u003eOperating modes: TCP Server, TCP Client, UDP, HTTP Client\u003c\/li\u003e\n\u003cli\u003eConfiguration: Serial AT commands or web browser\u003c\/li\u003e\n\u003cli\u003ePower supply: 3.3V or 5V DC\u003c\/li\u003e\n\u003cli\u003eDimensions: 25mm x 18mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible with\u003c\/h2\u003e\n\u003cp\u003eArduino, ESP32, ESP8266, Raspberry Pi, STM32, and any microcontroller with a UART interface.\u003c\/p\u003e\n\n\u003ch2\u003eWhat you can build with it\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eRemote sensor monitoring: Connect temperature, humidity, or pressure sensors to a serial port and stream data over Ethernet to a central server.\u003c\/li\u003e\n\u003cli\u003eIndustrial device control: Control relays, motors, or actuators from a remote PC via Ethernet using simple serial commands.\u003c\/li\u003e\n\u003cli\u003eIoT gateway: Bridge multiple serial devices to a local network for cloud connectivity and data logging.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eBuilt and Backed by Compoden\u003c\/h2\u003e\n\u003cp\u003eEvery 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.\u003c\/p\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the CH9121 Serial Port to Ethernet Converter Module used for?\u003c\/summary\u003e\n\u003cp\u003eIt 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.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I configure the CH9121 module?\u003c\/summary\u003e\n\u003cp\u003eYou 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.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat payment options are available for the CH9121 Serial Port to Ethernet Converter Module?\u003c\/summary\u003e\n\u003cp\u003eWe accept UPI, credit\/debit cards, and Cash on Delivery (COD), available across India.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow long does delivery take?\u003c\/summary\u003e\n\u003cp\u003eWe 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.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Product\",\n  \"name\": \"CH9121 Serial Port to Ethernet Converter Module\",\n  \"description\": \"Seamlessly bridge serial devices to Ethernet networks with the CH9121 Serial Port to Ethernet Converter Module. 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