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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 ==
The CM4-IO-WIRELESS-BASE is an industrial IoT wireless expansion module for the Raspberry Pi Compute Module 4. It provides Gigabit Ethernet, HDMI, USB, GPIO, plus RS485, CAN and RTC. An M.2 B Key / Mini-PCIe port allows connecting 4G/5G/LoRaWAN modules.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL20970 WSAL20970 – Industrial IoT Wireless Expansion Module Designed for Raspberry Pi Compute Module 4]
* [https://shop.jw-tech.eu/p/WSAL20971 WSAL20971 – Industrial IoT Wireless Expansion Module Designed for Raspberry Pi Compute Module 4]
* [https://shop.jw-tech.eu/p/WSAL21109 WSAL21109 – Industrial IoT Wireless Expansion Module Designed for Raspberry Pi Compute Module 4]

== Technical overview ==
* Supports all variants of Compute Module 4 via the CM4 socket.
* Two non-isolated RS485 ports with 600 W lightning protection, surge protection and 15 kV ESD protection; optional 120 Ω balance-resistor jumpers.
* One non-isolated CAN port with static protection; configured via the mcp2515-can0 SPI overlay.
* M.2 B Key extends PCIe, USB2.0, GPIO, I2C and SPI interfaces; compatible with SIM7600X-H, SIM8202X-M2, SIM8200X-M2, SX1302-868M-LoRaWAN-Gateway.
* Nano-SIM card slot for 5G/4G/3G/2G modules; a SIM card is required for wireless operation.
* HDMI output supports 4K@30 fps; three USB 2.0 ports; two RJ45 Gigabit Ethernet ports.
* Power supply via 5 V or 7–36 V DC; recommended PSU: at least 5 V/2.5 A.
* FAN header defaults to 12 V; switching to 5 V requires changing the FAN_VCC resistor.
* RTC with battery holder (CR1220) and wake-up capability for the CM4; I2C bus selectable between I2C-10/CSI-DSI and GPIO3/2/I2C-1.
* Dimensions: 145 × 90 × 40 mm; operating temperature range approximately -20 to +85 °C.

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
sudo nano /boot/firmware/config.txt
dtoverlay=uart3
dtoverlay=uart5
sudo nano /boot/config.txt
dtparam=spi=on
dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=25
sudo ip link set can0 up type can bitrate 1000000
candump can0
cansend can0 000#11.22.33.44
echo 6 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio6/direction
echo 0 > /sys/class/gpio/gpio6/value
sudo minicom -D /dev/ttyUSB2
AT+CUSBPIDSWITCH=9011,1,1
sudo dhclient -v usb0
</syntaxhighlight>

== Notes and version constraints ==
* Do not hot-plug any devices except USB and HDMI.
* Do not power the board simultaneously via 12 V DC and 5 V Type-C.
* Do not connect other devices while writing the CM4 image over Type-C.
* USB 2.0 is disabled by default; enabling it requires adding dtoverlay=dwc2,dr_mode=host to config.txt.
* RS485 and CAN are disabled by default and must be enabled in config.txt.
* The 4G/5G module is controlled via GPIO6; turning it on/off takes about 30 seconds if antenna or SIM is not connected.
* The Mini-PCIe adapter only matches the physical connector but does not wire real PCIe pins – PCIe devices are not supported.
* AT commands may be version-sensitive; adjust frequency with AT+CNBP if network connection fails.
* Operating temperature range refers to the CM4 itself; verify manufacturer extremes before field deployment.

== Source and revision record ==
* [https://www.waveshare.com/wiki/CM4-IO-WIRELESS-BASE CM4-IO-WIRELESS-BASE - Waveshare Wiki]
* Source revision: 89766
* Captured: 2026-09-02T04:28:16+00:00
* SHA-256: <code>a6ecb7d10bd9c4debec80d9b00ddde4aff5df9368823ea5e97ec4364bc74d9f0</code>

WSAL20970 – CM4-IO-WIRELESS-BASE/en - Versionsgeschichte

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