Compute Module 4 (CM4) Carrier Board

Mini-ITX carrier board for CM4 with WisBlock expansion support

RAK7391

SKU:810014

$149.00

Variant prices start at $149.00 to $581.00.

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What Is the Compute Module 4 (CM4) Carrier Board?

The CM4 Carrier Board is a Mini-ITX carrier board designed for the Raspberry Pi Compute Module 4 (CM4). It provides the core hardware foundation for building a gateway for LoRaWAN®, edge device, industrial gateway, or general-purpose embedded computer.

The board supports multiple expansion paths, including mPCIe, M.2, WisBlock, CSI, DSI, USB, HDMI, and Ethernet interfaces. It can also support multi-channel and multi-band LoRaWAN deployments, including setups with sub-GHz and 2.4 GHz gateway modules in the same device.

With flexible power input options, optional PoE support, power monitoring, fan control, and ultra-capacitor backup, the CM4 Carrier Board gives developers a practical platform for building connected systems that need expandability, reliability, and field-ready configuration options.

Who Is the CM4 Carrier Board Designed For?

Buyer type	Why RAK7391 fits
Developers of gateways for LoRaWAN	Supports radio expansion and gateway-oriented interfaces
Industrial IoT integrators	Works with WisBlock modules for ModBUS, analog, and general I/O
Edge gateway builders	Provides local compute, networking, storage, and expansion paths
Raspberry Pi CM4 developers	Uses the CM4 as the compute layer while exposing gateway-ready interfaces
OEMs and prototype teams	Reduces the need to design a custom CM4 carrier board from scratch

System Architecture

The Raspberry Pi Compute Module 4 acts as the compute layer. The RAK7391 carrier board provides the expansion layer for networking, radio modules, WisBlock modules, storage, display, camera, power input, cooling, and debugging. This separation lets developers choose the CM4 configuration, radio setup, and field I/O required for each gateway or edge deployment.

Layer	Role
Compute	Runs the operating system and local applications
Radio expansion	Supports gateway and wireless connectivity modules
WisBlock expansion	Adds industrial signals, sensors, and general I/O
Networking	Provides Ethernet and optional backhaul options
Software	Uses RAKPiOS, Docker, Python examples, and Node-RED examples
Reliability	Supports power monitoring, fan control, RTC, and backup energy features

Key Features of the CM4 Carrier Board

Hardware

Check the WisGate Connect Compatible Hardware Documentation.

Category	Hardware Details
Compute Module Support	Accepts the complete range of Raspberry Pi Compute Module 4 (CM4) modules
WisBlock Expansion	2 WisBlock IO connectors
Expansion Slots	3 mPCIe slots and 1 M.2 B-Key interface
Power Input	Flexible power supply options, including DC terminal, Phoenix terminal, and optional PoE
Display Output	HDMI 2.0 connector and MIPI DSI display FPC connector
Ethernet	1 GB Ethernet with optional PoE support and 2.5 GB Ethernet
USB	1 USB 2.0 port, 2 USB 3.0 ports, and Type-C USB socket for updating the CM4
Storage	Micro SD card socket for CM4 Lite modules
Camera Interface	2 MIPI CSI-2 camera FPC connectors
Cooling	Standard fan connector compatible with 12 V and 5 V fans through jumper cap configuration
Power Output	Output power connector with 5 V and 12 V output when using PoE
Raspberry Pi HAT Support	Raspberry Pi HAT connector
Debugging	Debug UART port
RTC	RTC with battery socket and wake-up support for CM4
Configuration	Jumpers for Wi-Fi and BLE enable/disable, EEPROM write enable, and buzzer enable

Mounting & Installation

The device supports multiple installation methods, allowing flexible deployment across industrial and commercial environments.

Note：DIN rail mounting and wall mounting are only applicable when CM4 Carrier Board RAK7391 is used with the aluminum enclosure.

Wall Mounting

RAK7391 supports direct wall mounting using the included mounting brackets. This enables flexible installation on walls or flat vertical surfaces, making it suitable for a wide range of indoor and semi-industrial deployments.

Wall mounting provides a reliable and straightforward installation method without requiring additional accessories.

Benefit	Description
Flexible Deployment	Suitable for offices, utility rooms, industrial sites, and edge installations.
Secure and Stable Installation	Ensures the device is firmly mounted on vertical surfaces for long-term operation.
No Additional Accessories Required	Wall mounting hardware is included for out-of-the-box installation.
Versatile Positioning	Allows installation in locations where DIN rail infrastructure is not available.

DIN Rail Mounting Support

RAK7391 supports installation on standard DIN rail systems (35mm DIN rail) using a DIN Rail Mounting Kit. This enables seamless integration into industrial control cabinets, electrical enclosures, and automation panels.

DIN rail mounting is widely used in industrial environments as it allows structured installation, efficient space utilization, and simplified maintenance.

Benefit	Description
Industrial-Ready Deployment	Designed for integration into control cabinets and electrical panels.
Secure and Stable Installation	Ensures the device is firmly mounted and protected in demanding environments.
Optimized Space Utilization	Supports clean and organized layouts within enclosures.
Service-Friendly Design	Allows easy installation, removal, and maintenance.

Software

We have prepared a custom Linux distribution for the WisGate Connect called RAKPiOS. The RAKPiOS is a fork of the Raspberry Pi OS with all the required drivers to use the device, some security changes, helper scripts and Docker included by default.

With the included rakpios-cli, you can easily configure the network and deploy several IoT services from a curated list of docker containers available from the device.

Comparison Table: RAK7391 vs Other CM4 Carrier Board Options

Feature / Benefit	RAK7391 Compute Module 4 (CM4) Carrier Board (This product)	Waveshare Compute Module 4 PoE 4G Board	DFRobot CM4 IoT Router Carrier Board Mini	Seeed Dual Gigabit Ethernet NICs Carrier Board	Waveshare CM4-IO-WIRELESS-BASE
Main build purpose	CM4-based LoRaWAN, edge, and industrial gateway builds	Industrial IoT base board with cellular and PoE support	Compact CM4 router board	Compact CM4 software-router board	CM4 wireless expansion base for cellular or LoRa modules
CM4 support	Supports Raspberry Pi CM4 as the compute layer	Supports Raspberry Pi CM4 variants	Supports Raspberry Pi CM4 series	Designed for Raspberry Pi CM4	Designed for Raspberry Pi CM4
LoRaWAN gateway support	Strong fit; supports radio expansion and up to four separate modules	Not mainly positioned as a gateway board	Not LoRaWAN-focused	Not LoRaWAN-focused	Supports LoRa module expansion through M.2 or Mini PCIe
WisBlock expansion	Yes; supports WisBlock modules for sensors, industrial signals, and general I/O	No WisBlock ecosystem support	No WisBlock support	No WisBlock support	No WisBlock support
Radio expansion	Multiple slots for radio modules	Cellular module support through M.2	Not radio-expansion focused beyond networking	Not radio-expansion focused beyond networking	Supports 4G, 5G, or LoRa wireless modules
Industrial signal support	Via WisBlock modules such as ModBUS, analog, and general I/O	Built-in industrial interfaces such as RS485, RS232, CAN, ADC, and GPIO	Limited; mainly networking and GPIO	Limited; mainly networking and peripheral access	Includes industrial interfaces such as RS485 and CAN
Ethernet / backhaul	Includes 1 GbE and 2.5 GbE options	Includes Gigabit Ethernet with PoE support	Dual Gigabit Ethernet	Dual Gigabit Ethernet	Includes Gigabit Ethernet
PoE support	Optional PoE support	Integrated PoE Ethernet support	No main PoE positioning	No main PoE positioning	Depends on configuration; not the main positioning
Storage / expansion	M.2, mPCIe, USB, and CM4 Lite microSD support	M.2, PCIe, USB, and CM4 Lite microSD support	microSD for CM4 Lite modules	microSD slot and USB expansion	M.2 or Mini PCIe wireless expansion
Display and camera support	HDMI, DSI, and CSI support	HDMI, DSI, and CSI support	Minimal; router-focused	Micro-HDMI, CSI, and DSI support	HDMI, CSI, and DSI support
Power reliability	Power monitoring, ultra-capacitor backup, fan control, RTC support	Wide power input, PoE, RTC, and fan header	Simpler USB-C power setup	Simpler compact-board power setup	RTC and fan resources; wireless-base power options vary
Software deployment	RAKPiOS, Docker, Python examples, and Node-RED examples	Raspberry Pi OS-oriented hardware support	OpenWRT, Raspberry Pi OS, and Ubuntu Server support	OpenWRT-supported router use	Raspberry Pi OS setup guidance and module-specific wiki resources
Best buyer benefit	Build a configurable CM4 gateway with LoRaWAN, WisBlock, edge, and industrial expansion	Build an industrial CM4 device with cellular, PoE, and built-in field interfaces	Build a small CM4 router with dual Ethernet	Build a compact OpenWRT-style router or networking device	Build a CM4 wireless gateway base with cellular or LoRa expansion

Use Case Examples of the CM4 Carrier Board

The CM4 Carrier Board RAK7391 supports practical IoT deployments where teams need configurable connectivity, local processing, and repeatable hardware builds.

Use Case #1: Multichannel LoRaWAN Gateway

A facilities team needs wider sensor coverage across separate building zones. The RAK7391 provides a CM4-based platform for radio expansion, Ethernet backhaul, local services, and repeatable gateway builds without requiring a custom carrier board.

Use Case #2: Industrial Gateway for Equipment Data Collection

A factory integrator needs to collect machine data without replacing existing equipment. By pairing the carrier board with WisBlock modules, the system can support local processing, protocol bridging, and structured data transfer to higher-level services.

Why choose RAK7391 Compute Module 4 (CM4) Carrier Board?

The RAK7391 Compute Module 4 (CM4) Carrier Board is a Mini-ITX Raspberry Pi CM4 carrier board designed for gateway, edge, and industrial IoT development. It provides expansion paths for radio modules, WisBlock modules, storage, networking, display, camera, power input, cooling, and debugging. Unlike basic CM4 IO boards or compact router boards, RAK7391 is built for configurable LoRaWAN gateway development, industrial data collection, private network deployments, and WisGate Connect-based systems.

Raspberry Pi is a trademark of Raspberry Pi Ltd.

What’s in the Box

RAK7391 CM4 carrier board
Set of jumpers
Phoenix male connector
12V2A power supply
Set of standoffs and screws to protect the board
Set of screws for the MiniPCIe, M.2, and WisBlock slots
Wall Mounting Kit
- 2 pc Wall Mount brackets
- 4 pc Wall anchors
- 4 pc Self-tapping screws
DIN Mounting Kit
- 2 pc DIN Mount brackets
- 4 pc M3 fixing screws