Waveshare Gigabit/2.5G Dual Ethernet Multi-Function Expansion Board Based On Raspberry Pi CM5 (NOT included), Supports RS485 Industrial Communication, 4G / 5G Module And 4K Display Output

Gigabit/2.5G Dual Ethernet Multi-Function Expansion Board Based On Raspberry Pi CM5 (NOT included), Supports RS485 Industrial Communication, 4G / 5G Module And 4K Display Output

The Gigabit/2.5G Dual Ethernet Multi-Function Expansion Board is a powerful and versatile solution designed specifically for the Raspberry Pi CM5 (module not included), enabling advanced networking and industrial communication capabilities. Equipped with dual Ethernet ports supporting both Gigabit and 2.5G high-speed connectivity, this board ensures fast and stable data transmission for demanding applications such as edge computing, IoT gateways, and network servers.

In addition to its robust networking features, the expansion board integrates RS485 industrial communication support, making it ideal for automation, control systems, and industrial environments. It also provides support for 4G/5G cellular modules, allowing seamless wireless connectivity in remote or mobile deployments where wired networks may not be available.

For multimedia and display applications, the board supports 4K display output, delivering high-resolution visuals suitable for digital signage, monitoring systems, and embedded display solutions. Designed with flexibility in mind, it offers multiple expansion interfaces, making it easy to integrate additional peripherals and customize according to project requirements.

User Manual / Datasheet / Example Codes Etc.

Features

• Do not plug or unplug any devices other than USB and HDMI while the system is powered on
• The Type-C port can be used as a USB SLAVE interface for flashing images or powering the device
• Onboard 1 USB port group with a total maximum output current of 2A (1x USB 3.2 Gen1 + 1x USB 2.0 port)
• Supports triple independent displays. When a MIPI DSI driver is added, the system will default to connecting to it regardless of whether a screen is connected, and the screen will display in split-screen mode (depending on the system version)
• Onboard M.2 M KEY interface, supports NVMe SSD protocol (or PCIe protocol AI modules).
• Onboard M.2 B KEY interface, supports 4G/5G communication modules
• 4 isolated RS485 channels + 1 isolated digital input + 1 isolated relay (fully isolated)
• Onboard encryption chip and single controllable buzzer
• Onboard BOOT button: Press and hold the BOOT button before powering on, then connect to a PC via Type-C to enter flashing mode
• When using Type‑C for programming, do not connect any other devices, otherwise insufficient power may prevent the device from being recognized

Specifications

• CM5 socket: Suitable for all variants of Compute Module 5
• Networking
• 1000M Ethernet RJ45 port × 1
• 2500M Ethernet RJ45 port × 1
• USB: USB 2.0 port (Type-C) × 1
• USB 2.0 port (Type-A) × 1
• USB 3.2 Gen1 port (Type-A) × 1
• Video: HDMI port × 1, supports 4K display output
• M.2
• M.2 M KEY (PCIe Gen2/3 × 1, supports 2230 / 2242 / 2280 NVMe or AI module)
• M.2 B KEY, supports connecting 4G / 5G communication module
• Storage: TF card socket for Compute Module 5 Lite (without eMMC) variants
• Serial Interface: RS485 × 4
• Digital Input: 1 × digital input (input voltage: 5V ~ 36V)
• Relay: Contact rating: ≤ 10A 250V AC or ≤ 10A 30V DC
• Fan header: 5V, 4PIN JST-SH PWM fan header
• Buzzer: 1-ch controllable buzzer
• Other: Onboard encryption chip
• Power Input: 7V ~ 36V wide voltage range (screw terminal + jack), 5V 5A Type-C port
• Dimensions: 132.50 × 112.20 × 34.50 (mm)

Package Includes

• CM5-ETH-RS485-4G-BASE x1
• Screws pack x1

More rich interfaces

Features multiple interfaces including ETH / MIPI / HDMI / TF Card Slot / USB / M.2 B KEY / M KEY, easy to use

What's On Board

Dimensions