Serial to Ethernet module-CH9121

Overview

product description

This module implements bidirectional transmission of TTL level serial port data to Ethernet. Internally integrated TCP/IP protocol stack, with 4 working modes: TCP client, TCP server, UDP client, and UDP server. It can be easily configured through the host computer software or serial port commands, which is convenient and fast. It is a quick channel for ordinary microcontrollers, PLCs and other equipment to access the Internet.

Pin function table

symbol	describe	symbol	describe
DIR	485 Transceiver switching	+5V	5V power supply
RXD2	Serial input 2	+3.3V	3.3V power supply
TXD2	Serial output 2	RSTI	Low level reset input
RXD1	Serial input 1	TCPS	Connection status indication
TXD1	Serial output 1	CFG0	Mode settings
GND	Common ground	RESET	reset

Design Files

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Update:2025-06-27 17:39:10

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