HLK-RM04 Uart Serial Port to Ethernet Wi-Fi Wireless Network Module

Serial to WIFI module, serial to Ethernet module, Ethernet to WIFI multi-function WIFI module, serial server module.

Integrated 10 / 100M adaptive Ethernet interface, serial communication maximum baud rate up to 230.4Kbps

Built-in 360M MIPS CPU, 16M RAM and 4M FLASH and wireless baseband and RF front end and a variety of peripheral bus

 

Supports IEEE 802.11 b / g / n via CE and FCC, supports transparent protocol data transfer mode

Support the vast majority of WIFI encryption and algorithms, WEP / WAP-PSK / WAP2-PSK / WAPI, encryption type WEP64 / WEP128 / TKIP / AES

AT + instruction set

Optional built-in onboard or external antenna

Support wireless work in AP mode and node (station) mode

Support network protocol: TCP / UDP / ARP / ICMP / HTTP / DNS / DHCP

Support DHCP automatically obtain IP

Pinout

No.  Function   Direction   Explanation
1      VDD5V            A            5 Power input
2      GND           GND             Power ground
3      GND           G                 Serial sending
4      3.3V            I                 3.3V power output
5      LINK1        I/O               Net gape 1 LED indicte
6      USB_P                           USB signal
7     USB_M                           USB signal
8     I2S_SD                          I2C DATA/GPIO
9     I2S_CLK                        I2C CLK/GPIO
10   GIOP0        I/O               Universal GPIO
11   TXOP1        I/O               Net 1 TX-P
12   TXON1       I/O                Net 1 TX-N
13    RXIP2       I/O                Net 2 RX-P
14    RXIN2       I/O                Net 2 RX-N
15    RXIN1       I/O                Net 1 RX-P
16    RXIP1       I/O                Net 1 RX-P
17    TXON2      I/O                Net gape 2 TX-N
18    TXOP2      I/O                Net gape 2 TX-P
19    RTS_N       I                All function serial RTS
20    UART_RX   I                Simple serial RX
21    UART_TX   O               Simple serial TX
22    RXD           I                All function serial RX
 

  • N/A

  • Electronics 111: PoE Explained – Powering Networking Devices Correctly
    A clear, engineering-level explanation of Power over Ethernet (PoE): how it works, why it is not “just 48V on a cable”, and how to safely design, select, and debug PoE-powered networking devices and systems.
  • IoT Best Practices & Compliance: A Comprehensive Engineering Guide
    A comprehensive, engineering-grade guide to designing, deploying, and operating Internet of Things (IoT) systems responsibly, securely, and in compliance with international standards and regulations. This tutorial covers architecture, hardware, firmware, networking, security, data governance, legal compliance, and long-term operational considerations.

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