M5Stack COMMU Module Extend RS485/TTL CAN/I2C Port

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The COMMU module is a muti-communication-interface-converter. Integrated with 2I2C, 1TTL, 1CAN, 1RS485.  The COMMU works with most of the series communications.

Default connection: TTL - UART0, RS485 - UART2. Since ESP32 pin map can be used to re-assign, you can re-assign or re-map the TTL or RS485 interface to other pins.

It is a UART Interface by default. But you can switch it to connect with UART2 when the jumpers have been changed. (J6, J7, J9, J10).


  • 2x I2C Interface
  • 1x CAN Interface
  • 1x RS485 Interface
  • 1x TTL Interface
  • CAN controller: MCP2515-1/SO
  • RS485 Transceiver: SP3485EN-L/TR

Package Contents

  • 1x M5Stack COMMU Module


Resources Parameter
Interface I2C x2, CAN x1, RS485 x1, TTL x1
CAN Controller MCP2515-1/SO
RS485 transceiver SP3485EN-L/TR
Net weight 13.5g
Gross weight 24g
Product Size 54.2 x 54.2 x 13mm
Package Size 60 x 57 x 17mm
Material Plastic (PC)


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