M5Stack COMMU Module Extend RS485/TTL CAN/I2C Port

---

Product Link

M5Stack COMMU Module Extend RS485/TTL CAN/I2C PortOpenELAB

Introduction

COMMU is a Multi-Communication-Interface-Converter. Integrated with 2I2C, 1TTL, 1CAN, 1RS485. Apparently COMMU has packed with most of series communications.

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

Be care about TTL Interface. It is a UART Interface actually by default. But you can switch it to connect with UART2 after changed those jumpers(J6, J7, J9, J10).

Features

• 2x I2C Interface

• 1x CAN Interface

• 1x RS485 Interface

• 1x TTL Interface

• CAN controller: MCP2515-1/SO

• RS485 Transceiver: SP3485EN-L/TR

Specifications

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*54.2*13mm
Package Size	60*57*17mm
Material	Plastic ( PC )

Pinout

Dimensions

• Length: 54mm

• Width: 54mm

• Height: 13mm

How to Use

1. Connection: Connect the COMMU Module to the M5Stack core using the M-Bus interface.

2. Library Installation: Install the necessary libraries for the communication protocols you intend to use (e.g., Wire for I2C, CAN for CAN communication).

3. Initialization: Initialize the communication protocols in your code using the appropriate library functions.

4. Data Transmission: Use the library functions to send and receive data via the RS485, TTL, CAN, or I2C interfaces.

5. Debugging: Utilize the debugging tools and functions to ensure proper communication and troubleshoot any issues.

FAQ

What applications can the COMMU Module be used for?

The COMMU Module is suitable for industrial automation, IoT projects, smart agriculture, and any application requiring robust communication protocols.

How do I connect the COMMU Module to my M5Stack core?

Use the M-Bus interface to connect the COMMU Module to the M5Stack core.

Can I use multiple communication protocols simultaneously?

Yes, you can configure and use multiple communication protocols simultaneously, depending on your project requirements.

What is the maximum communication distance for RS485?

RS485 can support communication distances up to 1200 meters, depending on the cable quality and environmental conditions.

How do I install the necessary libraries?

Use the Arduino Library Manager to install the libraries required for each communication protocol (e.g., Wire for I2C, CAN for CAN communication).

4o