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WSAL20970 – CM4-IO-WIRELESS-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 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.

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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:  

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

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

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