WSAL18821 – Compute Module PoE 4G Board/en

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

Technical reference for the Waveshare board: compatibility, resources, image flashing and test commands.

Related products at JW Tech

• WSAL18821 – Industrial IoT Mini-computer Add-ons, 4G / PoE Features, Based on Raspberry Pi Compute Module CM4S / CM3 / CM3+ Series
• WSAL18866 – Compute Module Industrial IoT Base Board, 4G / PoE Feature, For Raspberry Pi CM4S / CM3 Series
• WSAL19061 – Industrial IoT Mini-computer Add-ons, 4G / PoE Features, Based on Raspberry Pi Compute Module CM4S / CM3 / CM3+ Series

Technical overview

• Compatible with Raspberry Pi CM3, CM3 Lite, CM3+ and CM3+ Lite.
• Onboard SIM7600X module supports 4G/3G/2G via the SIM card slot.
• 10/100M Ethernet with PoE power over RJ45.
• 2.4 GHz Wi-Fi connection.
• Isolated industrial interfaces: CAN, RS485, RS232, ADC (16-bit), GPIO.
• USB HUB and USB-to-UART for serial debugging.
• Audio: 3.5 mm output and 4-pin speaker connector (8 Ω / 5 W).
• External RTC chip DS3231 with temperature sensor.
• Two CSI camera ports plus HDMI/DSI for displays.
• Industrial-grade aluminum alloy case.

Commands and examples – verify before use: 

sudo apt-get update
sudo apt-get install raspberrypi-ui-mods
cd /boot/ && sudo dtc -I dts -O dtb -o /boot/dt-blob.bin dt-blob-disp1-cam2.dts
sudo raspivid -t 0 -cs 0
sudo raspivid -t 0 -cs 1
sudo raspi-config
sudo reboot
cd RS485/c/ && sudo make clean && sudo make && sudo ./main
cd RTC/python/ && sudo python examples/main.py

Notes and version constraints

• Flashing the eMMC requires administrator privileges on Windows 10; the process may be unstable on Windows 7 or Linux.
• Only the eMMC versions of CM3/CM3+ (identifiable by an extra IC on the back) can be flashed via USB Slave.
• The default credentials of the provided image are user 'pi' and password 'raspberry'; these should be changed after first boot.
• Do not write to other portable drives while flashing to avoid conflicts.
• The camera number in the '-cs' parameter may not match the board silkscreen; verify before testing.

Source and revision record

• Compute Module PoE 4G Board - Waveshare Wiki
• Source revision: 104351
• Captured: 2026-09-01T03:41:16+00:00
• SHA-256: a58b722259cac5e7b8188fdcb6907838b8b412c5222c27a64a69386336813183