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Dual ETH Quad RS485 Base Board (B) For Raspberry Pi Compute Module 4, Gigabit Ethernet, 4CH Isolated RS485, USB2.0


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₹4,646.84 inc. GST
₹3,938.00 ex. GST
Waveshare's Dual ETH Quad RS485 Base Board (B) expands Raspberry Pi Compute Module 4 with dual Gigabit/100M Ethernet, 4 isolated RS485, HDMI, CSI, and USB. View full description
₹4,646.84 inc. GST
₹3,938.00 ex. GST


The Waveshare Dual ETH Quad RS485 Base Board (B) is an expansion board designed to be compatible with Raspberry Pi Compute Module 4. It offers a wide range of features and connectivity options. The board supports a 7-36V DC power supply and 5V DC power supply via the Type-C interface, providing flexibility in powering your Raspberry Pi Compute Module 4.

This expansion board is equipped with four isolated RS485 interfaces, allowing you to connect multiple RS485 devices with ease. It also features dual network ports with speeds of 100M and 1000M, enabling high-speed data transfer. The board includes an HDMI interface for connecting displays, two CSI interfaces for camera modules, and two USB interfaces for additional peripheral connectivity.

With the Waveshare Dual ETH Quad RS485 Base Board (B), you can expand the capabilities of your Raspberry Pi Compute Module 4 and create a wide range of projects that require versatile connectivity and communication options.


  • Compatible with Raspberry Pi Compute Module 4
  • Power supply: 7-36V DC and 5V DC via Type-C interface
  • Four isolated RS485 interfaces
  • Dual network ports: 100M+1000M
  • HDMI interface for display connectivity
  • Two CSI interfaces for camera modules
  • Two USB interfaces for peripheral connectivity
Package Content
Weight: 0.1 kg
  1. CM4-ETH-RS485-BASE-B x1

Dual ETH Quad RS485 Base Board For CM4

Designed For Raspberry Pi Compute Module 4

Connecting With Compute Module 4

Standard CM4 Socket And Suitable For All Variants Of Compute Module 4

More Rich Interfaces

Various Interfaces Including: Dual ETH / RS485 / CSI / FAN / HDMI / Micro SD / USB

Application Examples

Suitable For Raspberry Pi Applications Requiring Multi-Channel RS485 Communication Or Other Industrial Context

What's On Board

Outline Dimensions



Q: What are the main features of the Dual ETH Quad RS485 Base Board (B)?

A: The board features dual Gigabit Ethernet ports (100M/1000M), four isolated RS485 interfaces, HDMI, CSI camera interface, and USB for Raspberry Pi Compute Module 4.

Q: Which Raspberry Pi Compute Module is this board compatible with?

A: It is specifically designed for the Raspberry Pi Compute Module 4.

Q: What are the applications of this base board?

A: The board is suitable for industrial automation, IoT gateways, data acquisition systems, and other applications requiring reliable communication and multiple interfaces.

Q: Does the board have isolated power supplies for the RS485 interfaces?

A: Yes, the board provides isolated power supplies for each of the four RS485 interfaces, ensuring reliable communication and protecting against electrical interference.

Q: What is the difference between this base board (B) and other variants?

A: Waveshare offers different variants of the base board (A, B, C) with varying features and interfaces. The (B) variant specifically features the combination of dual Ethernet and quad RS485 interfaces.

Technical Specifications

CM4 Socket:
suitable for all variants of Compute Module 4
Gigabit Ethernet RJ45 connector, 100M Ethernet RJ45 connector
Isolated RS485 x 4, Power screw terminal x 1
USB 2.0 Type A x 2
MIPI CSI-2 port x 2 (15pin 1.0mm FPC connector)
HDMI port x 1, supports 4K 30fps output
Real-time clock with battery socket and ability to wake Compute Module 4
MicroSD card socket for Compute Module 4 Lite (without eMMC) variants
Fan Header:
allows speed adjustment, 5V
Power indicator × 1, CM4 status indicator × 1, User LED x 2, RS485 communication indicator x 8
Power Input:
93.6 x 108.8mm

Warranty Information

All the products supplied by Evelta are genuine and original. We offer 14 days replacement warranty in case of manufacturing defects. For more details, please visit our cancellation and returns page.

    2 Reviews

  • Posted by Sayan on 3rd Mar 2023


    Very friendly customer service

    I ordered this for a project that I'm doing for work. The customer service was very friendly and helpful. This is working great for my project.

  • Posted by Rakesh Pathak on 17th Feb 2023


    Worked nicely

    I needed a connection board quickly and I didn't want to pay much for it. I found this one and it worked perfectly.