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WSAL20535 – Compute Module 4 PoE 4G Board/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

Industrial IoT baseboard for the Raspberry Pi Compute Module 4 (not included). It provides PoE Ethernet, an M.2 connector for 4G/5G modules, isolated industrial interfaces (CAN, RS485, RS232, ADC, GPIO/I2C), plus HDMI, USB and RTC.

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Technical overview

  • The board is a baseboard for all variants of the Raspberry Pi Compute Module 4; the CM4 itself is not included.
  • Power input range: 7–36 V; for normal CM4 operation, 12 V / 2 A or higher supply is recommended.
  • PoE via the RJ45 Gigabit port following 802.3af; to enable it, set the PoE jumper to EN.
  • The M.2 B KEY supports 4G modules (e.g., SIM7600); 5G module support is limited, and the M.2 interface is exclusively for module connection and does not support SSDs.
  • Isolated interfaces: CAN, RS485, RS232, differential ADC, GPIO and I2C – suitable for industrial fieldbuses and sensors.
  • Two HDMI outputs each support up to 4K @ 30 fps; two MIPI DSI and CSI ports are present but cannot be used simultaneously by default.
  • USB2.0 is disabled by default; enable via config.txt: dtoverlay=dwc2, dr_mode=host.
  • An active buzzer is on GPIO22 (BCM); two user LEDs are on GPIO20 (green) and GPIO21 (red), both low-active.
  • RTC is powered via a CR1220 holder; a cooling-fan connector with speed control is integrated.
  • Operating temperature range per manufacturer: −25 °C to 80 °C.

Commands and examples – verify before use:  

sudo wget https://files.waveshare.com/upload/b/ba/Compute_Module_4_PoE_4G_Board_Code.zip
unzip -o Compute_Module_4_PoE_4G_Board_Code.zip -d ./Compute_Module_4_PoE_4G_Board_Code
sudo raspi-config   # Interfacing Options -> I2C -> Yes
sudo reboot
dtoverlay=dwc2,dr_mode=host   # in /boot/config.txt [cm4] section
sudo raspivid -t 0 -cs 0   # first camera
sudo raspivid -t 0 -cs 1   # second camera

Notes and version constraints

  • All instructions were tested on Raspberry Pi OS; other operating systems are not supported.
  • When flashing the image via USB-C, do not connect any other devices; the port is only for flashing, not for power supply.
  • Check fan voltage before connecting (5 V or 12 V); default is 12 V, switch via the FAN_VCC jumper.
  • When using 5G modules, some functions are limited; refer to the SIM8200EA-M2_5G HAT wiki for setup details.
  • Multiple hardware versions of this board exist due to chip shortages; contact after-sales service if unsure which version you have.
  • The two DISP interfaces cannot be used together by default.
  • The error 'config failed, hub doesn't have any ports' appears with newer Raspberry Pi OS; fix by removing otg_mode=1 and adding dtoverlay=dwc2, dr_mode=host.

Source and revision record

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