• M5Stack Unit RS485-ISO front product view
  • M5Stack Unit RS485-ISO connector and control detail
  • M5Stack Unit RS485-ISO feature overview
  • M5Stack Unit RS485-ISO rear hardware view
  • M5Stack Unit RS485-ISO side profile
  • M5Stack Unit RS485-ISO installation example
  • M5Stack Unit RS485-ISO dimensions and interface diagram
  • M5Stack Unit RS485-ISO package contents

M5Stack RS485-ISO Unit – Isolated RS485 Transceiver | U094

M5Stack RS485-ISO Unit – Isolated RS485 Transceiver | U094

LB-M5-U094

20 in stock
$13.00 USD
$13.00 USD $9.95 USD

Key Features

  • CA-IS3082W isolated RS485 transceiver
  • Half-duplex communication up to 500 kbps
  • Isolation withstand reference up to 1000 Vrms
  • Fail-safe receiver and protection functions
  • Terminal and supplied 120 Ω resistor

The M5Stack RS485-ISO Unit connects a TTL UART host to industrial RS485 meters, sensors, controllers, and Modbus RTU devices while adding galvanic isolation between the controller and field bus. Its CA-IS3082W transceiver supports half-duplex communication up to 500 kbps, and the isolated power stage helps reduce problems caused by ground-potential differences and electrical noise. Correct deployment still requires verified A/B polarity, topology, termination, biasing, shielding, protection, and protocol settings.

RS485-ISO Unit: Core Functions and Control

Separate the Host from Field-Side Wiring

The isolation barrier reduces direct conductive coupling between the controller and RS485 network.

Communicate over Half-Duplex RS485 up to 500kbps

The CA-IS3082W converts UART data into differential signaling for multidrop industrial serial networks.

Install End-of-Line Termination Correctly

The included 120 Ω resistor is intended for a physical end of the main bus, not every node.

RS485-ISO Unit Applications

  • Isolated Modbus RTU gateways
  • Industrial meter and sensor networks
  • Factory equipment monitoring
  • Long-distance multidrop communication
  • Controllers exposed to noisy field wiring

How to Integrate the RS485-ISO Unit

  1. Power off the system and verify terminal pinout, supply, and A/B labeling.
  2. Connect the Grove UART side to the host and the terminal to the field cable.
  3. Configure matching baud rate, data bits, parity, stop bits, address, and protocol.
  4. Install termination only at the two physical ends and apply biasing as required.
  5. Test one slave first, validate checksums, and expand the bus while monitoring errors.

RS485-ISO Unit Deployment Notes

  • Isolation does not replace correct grounding, shielding, surge protection, or enclosure design.
  • RS485 defines the electrical layer; the host must implement the application protocol.
  • Maximum node count depends on loading, topology, biasing, termination, and cable quality.
  • A/B naming differs among manufacturers and must be verified.
  • Do not service field wiring while unknown or hazardous equipment is energized.

RS485-ISO Unit Development Resources

M5Stack RS485-ISO Unit – Isolated RS485 Transceiver | U094

$13.00 USD

How can I confirm product compatibility?

Check the product specifications, operating voltage, communication interface, dimensions, connector type, and software requirements before ordering. Compatibility may also depend on your controller, operating system, development framework, library version, and project wiring.

If you are unsure, contact us before purchasing and include your controller model, intended application, power source, and any other hardware you plan to use. We will help you identify the most suitable option, but we cannot guarantee that every product will work with every platform or project.

Does the product come with a warranty?

Warranty coverage may vary by product and manufacturer. If your order arrives damaged, incomplete, or appears to have a manufacturing defect, contact us as soon as possible with your order number, product model, and clear photos or videos of the issue.

Our team will review the information and provide the appropriate next step according to the applicable product and after-sales policy. Damage caused by incorrect wiring, unsuitable voltage, unauthorized modification, soldering, misuse, or operation outside the documented specifications may not be covered.

How long does shipping take?

LogicBoundless provides worldwide shipping, with primary service coverage across the United States, Europe, and Asia. Orders are generally fulfilled from Shenzhen, China, and tracking information is provided after dispatch.

Processing and delivery times depend on product availability, destination, customs clearance, and the selected shipping service. Please review the Shipping Information page for the latest estimated delivery times and shipping conditions.

What is your return policy?

Eligible products may be returned within 30 days of delivery. Returned items must be unused, unsoldered, unmodified, and kept in their original condition with all packaging, cables, accessories, manuals, and included components.

Please contact support@logicboundless.com before sending anything back. Returns made without prior approval may not be accepted. Original shipping charges are generally non-refundable unless the return is caused by a verified product defect or fulfillment error.

Can you help if I have a technical problem?

Yes. LogicBoundless provides practical technical guidance for product setup, wiring, power, communication, code, and configuration issues.

To help us understand the problem efficiently, please provide your controller model, wiring photos, power source, code, library or firmware versions, expected behavior, and complete error messages. We cannot promise that every component will work in every system, but we will help you identify the likely cause and the next practical troubleshooting step.

Can I change or cancel my order?

Contact us as soon as possible if you need to change or cancel an order. We will try to assist before the order enters processing or is handed to the shipping carrier.

Once an order has been packed or dispatched, it may no longer be possible to change the products, delivery address, or shipping method. In that case, the standard return process may apply after delivery.

Don’t Just Take Our Word for It

  • A Clearer Way to Get Started

    LogicBoundless made it much easier to understand which components worked together. The product information was clear, and I could move from an idea to a working prototype without wasting time on incompatible hardware.

    Verified Maker
    First-Time IoT Builder

  • Practical Support Beyond the Product

    What stood out was the practical guidance. The specifications, compatibility notes, and troubleshooting resources helped us choose the right hardware and solve development issues more efficiently.

    Verified Customer
    Embedded Systems Engineer

  • Making Hardware Easier to Learn

    The clear explanations and project-focused resources made complex hardware easier to understand. Instead of simply following instructions, learners could see how each component contributed to the complete system.

    Education Partner
    STEM Instructor
  • RELIABLE COMPONENTS
    Hardware for real-world projects
  • GLOBAL SHIPPING
    Delivery to the US, Europe and Asia
  • TECHNICAL SUPPORT
    Help with setup and troubleshooting
  • CLEAR PRODUCT INFO
    Specifications you can understand