M5Stack Unit RS485 to TTL Isolated

This isolated RS485 unit is based on the RS485 bus protocol and serves as a half-duplex transceiver that can convert TTL levels to RS485 levels. The integrated CA-IS3082W isolation chip effectively shields against electrical disturbances and voltage spikes, ensuring reliable communication even in harsh industrial environments. A built-in DC-DC module provides the required voltage isolation, allowing the module to withstand up to 1000 V breakdown voltage. The fail-safe receiver circuit ensures that the receiver outputs a high level signal when the input is open or shorted, which enhances safety. With a supported transmission rate of up to 500 kbps and support for a maximum of 256 bus nodes, the unit is suitable for large networks. Platforms like Arduino and UIFlow (Blockly, Python) are available for developers, making integration into existing systems easy. The module offers protection features such as fail-safe, overcurrent, and thermal shutdown. It is commonly used in industrial multipoint systems where high immunity to interference and long transmission distances are required.

Features:

• The module features a built-in CA-IS3082W isolation chip that ensures clean signal transmission
• An isolated DC-DC module galvanically separates the power supply and reduces interference
• The signal transmission rate reaches up to 500 kbps and is suitable for fast data streams
• A fail-safe receiver ensures a defined high output level with open or shorted bus
• The module supports up to 256 bus nodes, enabling large networks
• The isolation breakdown voltage is up to 1000 V RMS
• 2 LEGO-compatible mounting holes are available to ease installation
• Supported development platforms include Arduino and UIFlow with Blockly and Python programming

Application Examples:

• Connecting industrial PLCs or sensors to microcontrollers in robust RS485 networks
• Integration into building automation systems for controlling heating and ventilation modules
• Communication between RS485 field devices and IoT gateways in energy or environmental engineering
• Use in lighting control systems (e.g., DMX lighting technology) with galvanic isolation
• Use in long-term measurement networks for data transmission over large distances

Download and Links:

• Quick Start Guide
• Official M5Stack Forum

Technical Data:

• Manufacturer: M5Stack
• Manufacturer SKU: U094
• Withstand voltage: 1000 V
• Maximum bus nodes: 256
• ESD protection: ±15 kV
• Protection features: Fail-safe, overcurrent protection, thermal shutdown protection
• Dimension: 56 × 24 × 10.2mm
• Weight: 18g

Package Contents:

• 1× Unit RS485-ISO
• 1× VH3.96-4P connector plug
• 1× 120-ohm termination resistor
• 1× HY2.0-4P Grove cable (20 cm)
• 1× I/O sticker for labeling