M5Stack COMMU Module Extend RS485/TTL CAN/I2C Port

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Product Link

M5Stack COMMU Module Extend RS485/TTL CAN/I2C PortOpenELAB

Description

COMMU is a Multi-Communication-Interface-Converter. Integrated with 2*I2C, 1*TTL, 1*CAN, 1*RS485. 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).

Note: When using with the Core2, the base needs to be removed in order to burn the program properly.

Features

• 2x I2C Interface

• 1x CAN Interface

• 1x RS485 Interface

• 1x TTL Interface

• CAN controller: MCP2515-1/SO

• RS485 Transceiver: SP3485EN-L/TR

Specification

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	133*95*16mm
Material	Plastic ( PC )

PinMap

MCP2515	ESP32 Chip
CAN_CS	GPIO12
CAN_INT	GPIO15
CAN_SCK	GPIO18
CAN_MISO	GPIO19
CAN_MOSI	GPIO23

I2C Interface	ESP32 Chip
I2C_SDA	GPIO21
I2C_SCL	GPIO22

MBUS PinMap

Schematic