M5Stack COMMU is a Muti-Communication-Interface-Converter. Integrated with 2IIC, 1TTL, 1CAN, 1RS485. Apparently, COMMU has packed with most of the series communications. Default connection: TTL – UART0, RS485 – UART2. Since the ESP32 pin map is allowed for re-assign, you can re-assign or re-mapping the TTL or RS485 interface to other pins. We 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).
- Two I2C Interface
- One CAN Interface
- One RS485 Interface
- One TTL Interface
- CAN controller: MCP2515-1/SO
- RS485 Transceiver: SP3485EN-L/TR
1 x M5Stack COMMU Module Extend RS485/TTL CAN/I2C Port