M5Stack RS485 to TTL Unit

The RS485 to TTL Unit from M5Stack converts the serial interface (TTL UART) to RS485. RS485 transmits data differentially over long lines and allows several devices on one bus, as is common in industry. The Unit connects to Port C, the bus to the supplied terminal.

If the controller must be galvanically isolated from the bus, the M5Stack Unit RS485 to TTL Isolated is suitable.

Recommended Accessories:

• M5Stack RS485-T Connector
• M5Stack M5GO IoT Starter Kit V2.7

Features:

• SP485EEN transceiver, M5Stack names MAX485/SP485EEN
• 4-pin HT3.96 terminal for the bus
• Several devices can be connected to one bus with the RS485-T connector
• Connects to Port C. The Basic Core itself only has Port A, Ports B and C come with the M5GO base, for example in the M5GO IoT Starter Kit V2.7
• 2 mounting holes for snap pins or screws

Application Examples:

• Addressing Modbus devices such as sensors or relays
• Data transmission over long lines
• Several controllers on one bus

Documentation:

• M5Stack documentation Unit RS485
• Arduino example by M5Stack (GitHub)

Technical Data:

• Manufacturer: M5Stack
• Manufacturer SKU: U034
• RS485 chip: SP485EEN
• Voltage converter: AOZ1282CI
• DC input: 12 V (M5Stack)
• Baud rate: up to 115200
• Connection: Grove HY2.0-4P, Port C (UART)
• Pinout: black GND, red 5V, yellow UART RX, white UART TX
• On the M5Stack Basic: yellow G17, white G16
• Dimensions: 32 × 24 × 10 mm
• Weight: 20 g

Scope of Delivery:

• 1× M5Stack RS485 to TTL Unit
• 1× 4-pin HT3.96 terminal
• 1× Grove cable 20 cm
• 1× storage box