The RAK7391 is a Raspberry Pi Compute Module 4 (CM4) carrier board in a Mini‑ITX form factor, serving as the motherboard for WisGate Connect. It includes multiple slots for radio modules and WisBlock modules, enabling developers to build gateways, edge devices, or general‑purpose computing solutions.
Core Specifications
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Form Factor: Mini‑ITX
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Compute Module: Raspberry Pi CM4
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Interfaces: HDMI, 1 Gb Ethernet (with optional PoE), 2.5 Gb Ethernet, USB2, USB3, mPCIe, CSI, DSI, M.2, WisBlock
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LoRaWAN Gateway Capability: Supports up to 4 separate modules (e.g., 16‑channel sub‑GHz LoRaWAN gateway plus 2.4 GHz LoRaWAN gateway in one device)
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Power Supply Options: DC terminal, Phoenix terminal, optional PoE
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Cooling: Fan interface with CPU temperature‑based control
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Power Monitoring: Integrated monitoring with ultra‑capacitors to sustain micro‑cuts and send notifications during power failures
Applications
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Multichannel/multi‑band LoRaWAN gateways
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Industrial gateways using WisBlock modules (ModBUS, 4–20 mA, 0–5 V, general IO)
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Edge gateways
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Standalone gateways for private LoRaWAN deployments
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Development platform for custom IoT products
Product Features
Hardware
See hardware compatibility section below.
- Accepts the complete range of CM4 modules
- 2x WisBlock IO connectors
- 3x mPCIe slots
- 1x M.2 B-Key interface
- Flexible power supply modes such as DC terminal, Phoenix terminal and POE (optional)
- HDMI 2.0 connector
- 1 GB Ethernet with PoE support (optional)
- 2.5 GB Ethernet
- 1x USB2.0 + 2x USB3.0
- Type-C USB socket for updating the CM4
- Micro SD Card socket for CM4 Lite modules
- Standard fan connector, compatible with 12 V and 5 V fans (jumper cap configuration)
- Output power connector (+5 V, +12 V with PoE)
- MIPI DSI display FPC connector (22 pin 0.5 mm pitch cable)
- 2x MIPI CSI-2 camera FPC connectors (22 pin 0.5 mm pitch cable)
- Raspberry Pi HAT connector
- PoE support via an optional module
- Debug UART port
- RTC with battery socket and ability to wake up CM4
- Configuration jumpers (Wi-Fi and BLE enabling/disabling, EEPROM write enable, Buzzer enabling)
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.
What's in the kit
- 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
Typical Application
- LoRaWAN gateway (multichannel, multiband)
- Industrial gateway leveraging existing WisBlock modules (ModBUS, 4-20mA, 0-5V, general IO)
- Edge gateway / Standalone gateway
- Development platform for new products