Quelltext der Seite 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.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL20885 WSAL20885 – Dual Gigabit Ethernet 5G/4G Base Board Designed for Raspberry Pi Compute Module 4]
* [https://shop.jw-tech.eu/p/WSAL21006 WSAL21006 – Dual Gigabit Ethernet 5G/4G Mini-Computer Based on Raspberry Pi Compute Module 4 (NOT Included), Metal Case, with Cooling Fan]
* [https://shop.jw-tech.eu/p/WSAL21108 WSAL21108 – Dual Gigabit Ethernet 5G/4G Mini-Computer Based on Raspberry Pi Compute Module 4 (NOT Included), Metal Case, with Cooling Fan]

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

== 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 ==
* [https://www.waveshare.com/wiki/CM4-DUAL-ETH-4G/5G-BASE CM4-DUAL-ETH-4G/5G-BASE - Waveshare Wiki]
* Source revision: 110301
* Captured: 2026-09-02T04:24:46+00:00
* SHA-256: <code>a3ed6b9079f669b8da8a7c032bcb48e0965b5129062a617325aab88eb035674e</code>