This is an industrial expansion module for the Raspberry Pi Compute Module 4 (not included), which features common interfaces such as Gigabit Ethernet, HDMI, USB, CSI and GPIO. The expansion also allows additional 4G / 5G / LoRa wireless communication modules (not included) to be connected via the M.2 or Mini-PCIe socket and sim card slot. There are also industrial interfaces including RS485, CAN and an onboard RTC. Combined with the industrial rail-mount protection case, the module is an ideal choice for building an IoT gateway, 4G/5G router, IoT data acquisition, or even a PLC device in an industrial automatic control system and more! Expansion base only. Does not include the CM4, power supply or M.2 B-Key LTE/LoRa module. We have stocked this base-only version to allow you to choose your wireless and power options separately. Important Notes * DO NOT hot-plug any devices except the USB and HDMI * Please check the fan voltage before connecting the cooling fan. The board supports a 12V cooling fan by default, if you want to use a 5V cooling fan, please change the FANVCC resistor * DO NOT connect other devices while writing CM4 via Type C interface * 5V/2.5A or higher power supply is recommended * DO NOT power the board by 12V DC and the 5V Type C at the same time * The USB2.0 is disabled by default, you need to add the line dtoverlay=dwc2,drmode=host to config.txt to enable it. What's Onboard? 1) CM4 socket - Suitable for all variants of Compute Module 4 2) HDMI connector - Supports 4K 30fps output 3) USB 2.0 ports - 3x USB 2.0, for connecting sorts of USB devices 4) RJ45 Gigabit Ethernet - 10/100/1000M compatible 5) DC power supply - 7 ~ 36V DC input 6) CM4 status indicator - PWR: Raspberry Pi power indicator - ACT: Raspberry Pi operating status indicator 7) 4G/5G module status indicator - M.2 PWR: module enable indicator - M.2 NET: module operating status indicator 8) PWR & USB - 5V DC power supply or USB programming port 9) M.2 B KEY - Supports 4G/5G modules, or other communication modules using USB channel 10) Nano-SIM card slot - Supports standard Nano-SIM card for 5G/4G/3G/2G communication 11) BOOT selection - ON: CM4 will be booted from USB-C interface - OFF: CM4 will be booted from eMMC or Micro SD card 12) DC power supply - 7 ~ 36V DC input 13) Dual non-isolated RS485 - 2x RS485, with 600W lightning proof, anti-surge, and 15KV ESD protection (reserved 120R optional balancing resistor jumper) 14) Non-isolated CAN - ESD protection and transient spike voltage protection (reserved 120R optional balancing resistor jumper) 15) Micro SD card slot - For connecting a Micro SD card with a pre-burnt image (Lite variant ONLY) 16) Fan header - For connecting a cooling fan, allows speed adjustment and measurement 17) Camera port - MIPI CSI camera port, 15Pin 1mm pitch 18) RTC battery holder - Supports CR1220 button cell 19) M.2 VCC selection - Select 3.3V or 4.2V power supply 20) RTC interruption configuration - PI-RUN: CM4 will reboot on RTC interruption - GL-EN: CM4 powerdown on RTC interruption - D17: D17 pin is triggered on RTC interruption (default) 21) IO-VREF selection - Set the CM4 IO logic level as 3.3V (default) or 1.8V 22) FAN power supply selection - Select 12V (default) or 5V power to drive the fan 23) System function configuration - BTDIS: Bluetooth disabled, for CM4 with antenna variant ONLY - WiFiDIS: WiFi disabled, for CM4 with antenna variant ONLY - WPDIS: boot mode switch, ONLY be used when NOT booted from eMMC or SD card 24) RTC/FAN I2C bus selection - SDA0/SCL0: I2C-10 is shared with CSI/DSI (default) - GPIO3/2: I2C-1 is shared with GPIO header 25) Partial GPIO header - Including 1x I2C, 2x GPIO pins, and power supply Specification CM4 Socket suitable for all variants of Compute Module 4 Networking Gigabit Ethernet RJ45 M.2 B KEY / Mini-PCIe (via adapter) for connecting 5G/4G/LoRa module Nano-SIM card slot, supports Nano-SIM card for 5G/4G/3G/2G USB USB 2.0 × 3 Pin Header Non-isolated RS485 × 2, Non-isolated CAN × 1, Partial GPIO pins Camera MIPI CSI-2 × 1 (15pin 1.0mm FPC connector) Video HDMI × 1, supports 4K 30fps output RTC Real-time clock with battery socket and ability to wake CM4 Storage MicroSD card socket for Compute Module 4 Lite (without eMMC) variants Fan Header 5V/12V, allows speed adjustment and measurement Power Input 5V USB-C or 7~36V Barrel Jack (centre-positive) Dimensions 145 × 90 × 40mm Package Contents * 1x CM4 IoT Wireless Base * 1x PCIe to 4G/LoRa adapter * 1x Screwdriver * 1x Screws pack You will also need * A power supply (5V USB-C or 7-36V centre-positive barrel jack) * Optional for wireless options: LTE/LoRa Module (M.2 B Key)/Sim card Resources * Product Wiki https://elecena.pl/product/22726215/industrial-iot-wireless-expansion-module-for-raspberry-pi-cm4 2023-03-07 https://elecena.pl/product/22726215/industrial-iot-wireless-expansion-module-for-raspberry-pi-cm4 2023-12-27 https://elecena.pl/product/22726215/industrial-iot-wireless-expansion-module-for-raspberry-pi-cm4 2024-09-18 https://elecena.pl/product/22726215/industrial-iot-wireless-expansion-module-for-raspberry-pi-cm4 2024-11-29 https://elecena.pl/product/22726215/industrial-iot-wireless-expansion-module-for-raspberry-pi-cm4 2024-11-30 https://elecena.pl/product/22726215/industrial-iot-wireless-expansion-module-for-raspberry-pi-cm4 2025-08-06 https://elecena.pl/product/22726215/industrial-iot-wireless-expansion-module-for-raspberry-pi-cm4 2025-11-28 https://elecena.pl/product/22726215/industrial-iot-wireless-expansion-module-for-raspberry-pi-cm4 2025-11-29