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WSAL20885 – CM4-DUAL-ETH-4G – 5G-BASE/en

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Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The board provides dual Gigabit Ethernet ports, an M.2 slot for 4G/5G modules, and interfaces for cameras, displays, and RTC.

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Technical overview

  • Compatible with all variants of the Raspberry Pi Compute Module 4 (CM4).
  • Two RJ45 Gigabit Ethernet ports: one native via CM4, the other via USB expansion (RTL8153 chip).
  • The M.2 B KEY only extends the USB 3.0 interface; PCIe devices are not supported.
  • A Nano-SIM card is required for 4G/5G operation.
  • The 4G/5G module can be disabled or enabled via GPIO6; switching takes about 30 seconds.
  • The FAN header outputs 12 V by default; a 5 V fan requires reflowing the FAN_VCC resistor.
  • A 5 V power supply of at least 2.5 A is recommended.
  • No other devices should be connected while writing the image over USB Type-C.

Commands and examples – verify before use:  

sudo apt-get install minicom
sudo minicom -D /dev/ttyUSB2
AT+CUSBPIDSWITCH=9011,1,1
sudo dhclient -v usb0
AT+CNBP=0x0002000000400183,0x000001E000000000,0x0000000000000021
AT+CNBP=0x0002000000400180,0x480000000000000000000000000000000000000000000042000001E200000095,0x0000000000000021
AT
ATE
AT+CGMI
AT+CGMM
AT+CGSN
AT+CSUB
AT+CGMR
AT+IPREX
AT+CRESET
AT+CSQ
AT+CPIN?
AT+COPS?
AT+CREG?
AT+CPSI?

Notes and version constraints

  • Do not hot-plug any devices except USB and HDMI.
  • Check the fan voltage before connecting; the default is 12 V.
  • When using the Bullseye branch, replace “apt-get” with “apt”; only Python 3 is supported.
  • RTC and CSI/DSI cannot be used simultaneously unless the I2C bus is switched to I2C1.
  • There is no official fan configuration method; the referenced solution is third-party and not endorsed by the manufacturer.
  • Exact compatibility and safety details depend on the specific CM4 variant (with/without antenna) and require individual verification.

Source and revision record

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