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). Features * 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 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 x 54.2 x 13mm Package Size 60 x 57 x 17mm Material Plastic (PC) Resources * Documents https://elecena.pl/product/22723910/m5stack-commu-module-extend-rs485-ttl-can-i2c-port 2023-03-07 https://elecena.pl/product/22723910/m5stack-commu-module-extend-rs485-ttl-can-i2c-port 2023-12-27 https://elecena.pl/product/22723910/m5stack-commu-module-extend-rs485-ttl-can-i2c-port 2024-09-19 https://elecena.pl/product/22723910/m5stack-commu-module-extend-rs485-ttl-can-i2c-port 2024-11-29 https://elecena.pl/product/22723910/m5stack-commu-module-extend-rs485-ttl-can-i2c-port 2024-11-30 https://elecena.pl/product/22723910/m5stack-commu-module-extend-rs485-ttl-can-i2c-port 2025-04-29 https://elecena.pl/product/22723910/m5stack-commu-module-extend-rs485-ttl-can-i2c-port 2025-11-28 https://elecena.pl/product/22723910/m5stack-commu-module-extend-rs485-ttl-can-i2c-port 2025-11-29