{"id":15522228830445,"title":"1Pc CH9121 Serial-to-Ethernet Network Module Serial Server for STM32","handle":"1pc-ch9121-serial-to-ethernet-network-module-serial-server-for-stm32","description":"\u003ch3\u003e1Pc CH9121 Serial-to-Ethernet Network Module Serial Server for STM32\u003c\/h3\u003e\n\u003cp id=\"b\"\u003eCH9121 Serial to Ethernet Module, TCP\/UDP Network Serial Server, 3.3V\/5V TTL,\nRS485 Auto Switching, STM32 Compatible Product Specifications Chip: CH9121\nSupply Voltage: 3.3V \/ 5V Serial Baud Rate: 300 bps to 921,600 bps TTL Level:\n3.3V and 5V compatible Ethernet: 10\/100M auto-negotiation Modes: TCP Client,\nTCP Server, UDP Client, UDP Server Features: DHCP, DNS, KEEPALIVE Dimensions:\n43 x 26 mm Pin Definitions RESET: Factory reset \/ power-on detect, active low\nRSTI: External reset input, active low DIR: RS485 transmit\/receive control\nCFG: Configuration mode select pin TCPS: TCP client connection status output\nRXD: UART input RUN: Module status indicator output TXD: UART output GND:\nGround 3V3: 3.3V power input 5V: 5V power input Applications Serial device\nnetworking; STM32 and MCU communication; Industrial control systems; RS485\nnetwork conversion; IoT and embedded Ethernet projects\u003c\/p\u003e \n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n \u003cul class=\"a\"\u003e\n \u003cli\u003eSerial to Ethernet Conversion: Converts serial data to network data with bidirectional transparent transmission, ideal for STM32, microcontrollers, and industrial communication projects.\u003c\/li\u003e\n \u003cli\u003eMultiple Working Modes: Supports TCP CLIENT, TCP SERVER, UDP CLIENT, and UDP SERVER modes for flexible network communication in different applications.\u003c\/li\u003e\n \u003cli\u003eWide Baud Rate and TTL Compatibility: Supports serial baud rates from 300 bps to 921,600 bps and works with 3.3V\/5V TTL levels for easy device integration.\u003c\/li\u003e\n \u003cli\u003eBuilt-In Network Features: Includes integrated TCP\/IP stack, 10\/100M auto-negotiation, MDI\/MDIX auto-detection, DHCP, DNS, and KEEPALIVE support for reliable networking.\u003c\/li\u003e\n \u003cli\u003eEasy Configuration and Compact Size: Settings can be configured via host software or AT commands and are saved after power-off; compact 43 x 26 mm size makes installation simple.\u003c\/li\u003e\n \u003c\/ul\u003e","published_at":"2026-11-11T02:12:50+11:00","created_at":"2026-11-10T20:18:07+11:00","vendor":"MakerCircuit","type":"Serial Adapters","tags":["electronics_NR_Nov2026"],"price":9800,"price_min":9800,"price_max":9800,"available":true,"price_varies":false,"compare_at_price":null,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":68250158465261,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"B0HFBT3BXL","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"1Pc CH9121 Serial-to-Ethernet Network Module Serial Server for STM32","public_title":null,"options":["Default Title"],"price":9800,"weight":15,"compare_at_price":null,"inventory_management":"shopify","barcode":null,"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}],"images":["\/\/leoforward.com\/cdn\/shop\/files\/B0HFBT3BXL.jpg?v=1794302290","\/\/leoforward.com\/cdn\/shop\/files\/51fXjmrel5L.jpg?v=1794302289","\/\/leoforward.com\/cdn\/shop\/files\/41Lr3m0RCZL.jpg?v=1794302289","\/\/leoforward.com\/cdn\/shop\/files\/41iNzFPiYaL.jpg?v=1794302289","\/\/leoforward.com\/cdn\/shop\/files\/51SH1it0ZBL.jpg?v=1794302290"],"featured_image":"\/\/leoforward.com\/cdn\/shop\/files\/B0HFBT3BXL.jpg?v=1794302290","options":["Title"],"media":[{"alt":null,"id":46974178722029,"position":1,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/leoforward.com\/cdn\/shop\/files\/B0HFBT3BXL.jpg?v=1794302290"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/leoforward.com\/cdn\/shop\/files\/B0HFBT3BXL.jpg?v=1794302290","width":800},{"alt":null,"id":46974178754797,"position":2,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/leoforward.com\/cdn\/shop\/files\/51fXjmrel5L.jpg?v=1794302289"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/leoforward.com\/cdn\/shop\/files\/51fXjmrel5L.jpg?v=1794302289","width":800},{"alt":null,"id":46974178787565,"position":3,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/leoforward.com\/cdn\/shop\/files\/41Lr3m0RCZL.jpg?v=1794302289"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/leoforward.com\/cdn\/shop\/files\/41Lr3m0RCZL.jpg?v=1794302289","width":800},{"alt":null,"id":46974178820333,"position":4,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/leoforward.com\/cdn\/shop\/files\/41iNzFPiYaL.jpg?v=1794302289"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/leoforward.com\/cdn\/shop\/files\/41iNzFPiYaL.jpg?v=1794302289","width":800},{"alt":null,"id":46974178853101,"position":5,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/leoforward.com\/cdn\/shop\/files\/51SH1it0ZBL.jpg?v=1794302290"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/leoforward.com\/cdn\/shop\/files\/51SH1it0ZBL.jpg?v=1794302290","width":800}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch3\u003e1Pc CH9121 Serial-to-Ethernet Network Module Serial Server for STM32\u003c\/h3\u003e\n\u003cp id=\"b\"\u003eCH9121 Serial to Ethernet Module, TCP\/UDP Network Serial Server, 3.3V\/5V TTL,\nRS485 Auto Switching, STM32 Compatible Product Specifications Chip: CH9121\nSupply Voltage: 3.3V \/ 5V Serial Baud Rate: 300 bps to 921,600 bps TTL Level:\n3.3V and 5V compatible Ethernet: 10\/100M auto-negotiation Modes: TCP Client,\nTCP Server, UDP Client, UDP Server Features: DHCP, DNS, KEEPALIVE Dimensions:\n43 x 26 mm Pin Definitions RESET: Factory reset \/ power-on detect, active low\nRSTI: External reset input, active low DIR: RS485 transmit\/receive control\nCFG: Configuration mode select pin TCPS: TCP client connection status output\nRXD: UART input RUN: Module status indicator output TXD: UART output GND:\nGround 3V3: 3.3V power input 5V: 5V power input Applications Serial device\nnetworking; STM32 and MCU communication; Industrial control systems; RS485\nnetwork conversion; IoT and embedded Ethernet projects\u003c\/p\u003e \n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n \u003cul class=\"a\"\u003e\n \u003cli\u003eSerial to Ethernet Conversion: Converts serial data to network data with bidirectional transparent transmission, ideal for STM32, microcontrollers, and industrial communication projects.\u003c\/li\u003e\n \u003cli\u003eMultiple Working Modes: Supports TCP CLIENT, TCP SERVER, UDP CLIENT, and UDP SERVER modes for flexible network communication in different applications.\u003c\/li\u003e\n \u003cli\u003eWide Baud Rate and TTL Compatibility: Supports serial baud rates from 300 bps to 921,600 bps and works with 3.3V\/5V TTL levels for easy device integration.\u003c\/li\u003e\n \u003cli\u003eBuilt-In Network Features: Includes integrated TCP\/IP stack, 10\/100M auto-negotiation, MDI\/MDIX auto-detection, DHCP, DNS, and KEEPALIVE support for reliable networking.\u003c\/li\u003e\n \u003cli\u003eEasy Configuration and Compact Size: Settings can be configured via host software or AT commands and are saved after power-off; compact 43 x 26 mm size makes installation simple.\u003c\/li\u003e\n \u003c\/ul\u003e"}