M5Stack COMMU Module RS485 TTL CAN I2C Interface Expansion

Description

The M5Stack COMMU Module is a compact multi-protocol communication expansion module for M5Stack Core projects. SKU M5-M011 adds RS485, TTL, CAN, and I2C interfaces in one module, making it useful for industrial communication, serial device gateways, sensor hubs, and embedded protocol bridge projects.

The module provides two I2C ports, one CAN port, one RS485 port, and one TTL port. It integrates an MCP2515-1/SO CAN controller and an SP3485EN-L/TR RS485 transceiver, giving developers a practical way to connect M5Stack systems to mixed serial buses and field devices.

With a compact 54.2 x 54.2 x 13mm housing and lightweight plastic enclosure, the COMMU Module fits prototyping benches, mobile robots, controller nodes, and compact IoT installations where multiple communication interfaces are needed without building a custom adapter board.

Features

• Multi-protocol expansion: adds I2C, CAN, RS485, and TTL communication to compatible M5Stack Core systems.
• Dual I2C ports: provides two I2C interfaces for sensors, peripheral modules, and short-distance device expansion.
• CAN communication: integrates the MCP2515-1/SO CAN controller for CAN bus experiments and embedded control projects.
• RS485 communication: uses the SP3485EN-L/TR RS485 transceiver for industrial serial communication and bus-style device wiring.
• TTL serial interface: supports TTL-level UART communication for serial peripherals and protocol bridge projects.
• Compact module design: 54.2 x 54.2 x 13mm module with PC plastic enclosure for tidy stacking and integration.
• M5Stack ecosystem fit: suitable for M5Stack-based industrial control, IoT gateway, robot controller, and sensor hub development.
• Rapid prototyping: useful when one controller needs to talk to several communication buses during proof-of-concept work.

Specifications

Applications

• Industrial communication gateways and RS485 serial device integration.
• CAN bus experiments, controller nodes, and embedded protocol bridge designs.
• M5Stack robot controllers, mobile platforms, and mixed sensor bus prototypes.
• IoT data acquisition systems that need I2C, TTL, CAN, and RS485 interfaces.
• Modbus-style serial projects, field-device testing, and compact automation demos.

Product List

Other Content

Interface note: This module is designed for communication expansion. Confirm voltage levels, bus wiring, termination, grounding, and protocol settings before connecting industrial RS485 or CAN devices.

UART note: TTL defaults to UART0 and RS485 defaults to UART2. Use the onboard jumper configuration only when your project requires a different serial mapping.

CAN note: The MCP2515 CAN controller is suitable for CAN bus experiments and embedded communication, but final bus speed, termination, and software configuration depend on the host application.

Selection note: Choose the M5Stack COMMU Module when a single compact M5Stack system needs RS485, TTL, CAN, and I2C expansion without a custom carrier board.

Resources

• M5Stack COMMU Module Official Documentation
• SP3485 RS485 Transceiver Datasheet
• MCP2515 CAN Controller Datasheet

FAQ

What is M5-M011?

M5-M011 is the M5Stack COMMU Module, a multi-protocol communication module with RS485, TTL, CAN, and I2C interfaces.

Which interfaces does the module provide?

It provides I2C x2, CAN x1, RS485 x1, and TTL x1.

Which CAN and RS485 chips are used?

The module uses an MCP2515-1/SO CAN controller and an SP3485EN-L/TR RS485 transceiver.

What is included in the package?

The package includes one M5Stack COMMU Module.

What projects is it best suited for?

It is well suited for industrial communication, M5Stack IoT gateways, robot controllers, serial protocol bridges, CAN bus experiments, and RS485 device integration.