Waveshare Dual ETH Quad RS485 Base Board (B) for Raspberry Pi Compute Module 4


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SKU: 1231451
  1. Power Input: 7-36V
  2. CM4 Socket: suitable for all variants of Compute Module 4
  3. Networking: Gigabit Ethernet RJ45 connector, 100M Ethernet RJ45 connector
  4. USB: USB 2.0 Type A × 2
  5. Camera: MIPI CSI-2 port × 2 (15pin 1.0mm FPC connector)
  6. Video: HDMI port × 1, supports 4K 30fps output





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Raspberry Pi Compute Module 4 - 4GB RAM, 32GB eMMC, 2.4/5.0GHz Wi-Fi & Bluetooth 5.0 (CM4104032) ₹ 7449

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Category: Raspberry Pi Hats

My name is CM4-ETH-RS485-BASE-B, which is an expansion board that can be used with Raspberry Pi Compute Module 4, and supports a 7-36V DC power supply and 5V DC-DC power supply of Typc-C interface. Onboard four isolated RS485 interfaces, 100M+1000M dual network ports, HDMI interface, two CSI interfaces, two USB interfaces, etc…


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


  1. Do not plug and unplug any device except USB and HDMI when it is powered on
  2. Confirm the fan voltage before connecting, only support 5V
  3. The Type C interface can be used as a power supply or as a USB interface to burn the image (need to use the DIP switch to switch)
  4. In order to ensure the normal power supply of CM4, please do not connect other devices when using the Type C interface to burn the image.
  5. When CM4 is in normal use, it needs to provide a 5V 2A power supply for CM4. Otherwise, there may be problems such as automatic shutdown, frequency reduction, and so on.
  6. USB2.0 is closed by default, if you need to open it, you need to add dtoverlay=dwc2,dr_mode=host in config.txt

Useful link:

Waveshare Dual ETH Quad RS485 Base Board (B)

Packages Includes: 

1 x Waveshare Dual ETH Quad RS485 Base Board (B) for Raspberry Pi Compute Module 4

SKU: 1231451 Category:

MIPI CSI-2 port × 2 (15pin 1.0mm FPC connector)


HDMI port × 1, supports 4K 30fps output


Real-time clock with a battery socket and the ability to wake Compute Module 4


MicroSD card socket for Compute Module 4 Lite (without eMMC) variants

Fan Heater

Allows speed adjustment, 5V


Power indicator × 1,
CM4 status indicator × 1,
User LED × 2,
RS485 communication indicator × 8

Shipping Weight 0.152 kg
Shipping Dimensions 15 × 11 × 4 cm
6 Months Warranty

This item is covered with a supplier warranty of 6 months from the time of delivery against manufacturing defects only. This is a quality product from the original manufacturer. Only manufacturing defects are covered under this warranty. Replacement will be done against manufacturing defects.

What voids the warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

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Country Of Origin: China