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Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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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.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL20535 WSAL20535 – Compute Module 4 Industrial IoT Base Board, for all Variants of CM4]
* [https://shop.jw-tech.eu/p/WSAL20719 WSAL20719 – Industrial IoT Mini-Computer Based on Raspberry Pi Compute Module 4 (NOT Included), PoE, 5G/4G, Metal Case, Cooling Fan]
* [https://shop.jw-tech.eu/p/WSAL20785 WSAL20785 – Industrial IoT Mini-Computer Based on Raspberry Pi Compute Module 4 (NOT Included), PoE, 5G/4G, Metal Case, Cooling Fan]
* [https://shop.jw-tech.eu/p/WSAL20817 WSAL20817 – Industrial IoT Mini-Computer Based on Raspberry Pi Compute Module 4 (NOT Included), PoE, 5G/4G, Metal Case, Cooling Fan]
* [https://shop.jw-tech.eu/p/WSAL20897 WSAL20897 – Industrial IoT Mini-Computer Based on Raspberry Pi Compute Module 4 (NOT Included), PoE, 5G/4G, Metal Case, Cooling Fan]

== 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:'''
<syntaxhighlight lang="text">
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
</syntaxhighlight>

== 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 ==
* [https://www.waveshare.com/wiki/Compute_Module_4_PoE_4G_Board Compute Module 4 PoE 4G Board - Waveshare Wiki]
* Source revision: 109768
* Captured: 2026-09-02T03:58:49+00:00
* SHA-256: <code>75e223b54aa3f89babf35d27455599441d8f95ef2e31c1b201fbc4344b8c0d5b</code>

WSAL20535 – Compute Module 4 PoE 4G Board/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex