Description
Reviews
| Brand | - |
| Category | Electronic Components / Maker DIY / Development Boards & Control Boards |
| Origin | - |
| Communication Protocol | MODBUS RTU |
| Interface Type | RS485 Half-Duplex |
| Relay Quantity | 4 Channels |
| Input Voltage | 5V - 30V DC |
| Max Relay Load | 10A 250VAC / 10A 30VDC |
| Digital Inputs | 4 Opto-Isolated Channels |
| Digital Outputs | 2 Open Collector Channels |
| Baud Rate Support | 1200 to 115200 bps |
| Operating Temperature | -20°C to 70°C |
| PCB Dimensions | 85mm x 55mm x 20mm |
Anonymous
Apr 02, 2026
Rating: 4/5
Does what it says
Latency is low enough for our monitoring application. Wish it had more digital inputs, but for the size, it's compact.
Anonymous
Mar 27, 2026
Rating: 5/5
Great for Student Projects
Bought five for our robotics lab. Students find the wiring terminals easy to use. No failures so far.
Anonymous
Mar 02, 2026
Rating: 4/5
Solid build, docs need work
Hardware is excellent and isolated well. Had to guess some register addresses initially as the manual was vague. Once configured, it's been running for weeks.
Anonymous
Feb 23, 2026
Rating: 5/5
Perfect for Home Automation
Integrated smoothly with my ESP32 setup. The MODBUS library worked flawlessly. Relays click loudly but feel sturdy.
Anonymous
Feb 07, 2026
Rating: 5/5
Reliable I/O Expansion
Using this to expand inputs on a small PLC. Communication is stable over long cables. Good value for the price point.
Q: Is this compatible with Arduino Uno?
A: Yes, you need an RS485 shield or converter module to connect the TX/RX lines. Use a MODBUS library.
Q: Are the inputs dry contact or voltage type?
A: The digital inputs are opto-isolated and accept voltage signals typically between 5V and 30V DC.
Q: What is the maximum wire length for RS485 here?
A: Standard RS485 specs apply, up to 1200 meters depending on baud rate and cable quality.
Q: Does it come with a power supply?
A: No, the module requires an external DC power supply within the 5V-30V range.
Q: Can I control this via Python on a Raspberry Pi?
A: Yes, using a USB to RS485 adapter and Python MODBUS libraries like pymodbus.
Fruit and Vegetable Slicer - Stainless Steel Commercial Electric Multi-Function Shredder for Radish, Potato, Cucumber, Pepper, Automatic
$2,880.00
CAAS-Developed Granular Insecticide and Fungicide for Vegetable Gardens – Soil Pest Control and Fertilizer for Enhanced Vegetable Growth and Yield
$13.50
Marie's C6823 Sketch Blending Stumps (3-Pack), Professional Charcoal and Pastel Smudging Tools for Art Students and Beginners, Hard/Small/Highlight Set on Newsprint
$7.48
Inverted Water Dispenser Stand with Manual Pump for Large Mineral Water Bottles
$67.00
Lanzhai Flagship Store Multifunctional Retro Brush Washer Set, Creative Ceramic Large National Painting Tea Rinse Bowl, Art Display Paperweight, Student Calligraphy Supplies
$8.42
Multi-Function Vanity Shelf Over Toilet - Floor-Standing Thickened Plastic Storage Cabinet for Squat Toilet Gaps
$52.49
100% Cotton Watercolor Paper Pad 300gsm - Cold/Hot Press, 8K/16K/32K Sizes, Glued on Four Sides for Academy & Portable Sketching
$11.90
Commercial Large Shredding Machine Tornado Potato Slicer Wavy Slice Equipment Carrot Slicer Multi-Function
$20,000.00
Electric Heating Pasteurization Tank – Horizontal Spray Type for Fresh Milk and Food Sterilization
$11,211.00
![[First Batch Deposit] Spring Cherry & Pear Snow - Original Lolita Ballet-Style Cake Dress Chinese JSK](https://www.gosteppe.com/cache/small/product/269019/legacy-main-be5286e5316da63aa7d52258.webp)
[First Batch Deposit] Spring Cherry & Pear Snow - Original Lolita Ballet-Style Cake Dress Chinese JSK
$5.00
Bottled Water Electric Pump Bracket, Mineral and Pure Water Dispenser, Automatic Water Outlet Device
$383.98
Micro-Hyperbaric Oxygen Chamber - Rigid Sit/Lie Model for Home and Commercial Use, High-Altitude Oxygen Therapy Room
$150.00
Stainless Steel Illuminated Hotel Room Number Plate, Smart Electronic Door Sign with Do Not Disturb and Make Up Room Bell
$10.00
Paper Blending Stump A1zdq001 - Large Art Sketch Highlighting Tool for Students
$4.15
Continental Run-Flat Tires 225 235 245 255 265/45 50 55R17R18R19R20R21R22
$350.00
3D Printing Pen for Children - 3D Stereoscopic Drawing Toy for Boys and Girls (Ages 6+)
$35.70
MOOCAT Loose-Leaf Refill – 300G Wood Pulp Fine-Texture Blank Paper for OC Binders A9/B5/M5/M6 Hand Drawing
$12.90
Lanzhai Calligraphy Wool Felt Mat – Mini Arm Rest and Inkstone Pad with Creative Chinese Style Design for Painting and Writing
$7.48
Qing Dynasty Calligrapher Lin Zexu Guangeti Small Regular Script: Buddha Speaks of the Infinite Life Sutra, Brush Tracing Practice Long Scroll Copybook
$8.80
Lightweight Ceramsite Bottom Padding, Professional Backfill for Sunken Bathroom Engineering and Construction, Large Granules
$30.10
![[In Stock] MINISO YOYO Wind-Chasing Diary Series Aromatherapy Figure Blind Box – Youyou-chan Ornament](https://www.gosteppe.com/cache/small/product/269008/legacy-main-75745db0463ce5521fe5703d.webp)
[In Stock] MINISO YOYO Wind-Chasing Diary Series Aromatherapy Figure Blind Box – Youyou-chan Ornament
$49.00
Sanitary Juice Beverage Dairy Mixing Tank Food Pharmaceutical Electric Heating Emulsification Reaction Dissolution Tank
$4,122.00
Zhi Paper Calligraphy Copybook: Shen Du's Red Cliff Ode, Jingzhai Zhen, and Bu Zi Qi Shuo - Small Regular Script Cards for Tracing Practice
$17.00
Maike Outdoor Waterproof Dry Bag - Crossbody Travel Backpack for Rafting Diving and Beach Activities
$19.90
Oriental Pearl Dual Porcelain Jar Gift Set: Green Tea, Black Tea, Jin Jun Mei, and Pu'erh Loose Leaf Tea in Porcelain Jars
$140.41
Transparent Retainer Storage Case – Portable Soaking and Cleaning Box for Orthodontic Appliances and Dentures
$8.42
Original Wang Xizhi Huangting Small Regular Script Calligraphy Copybook for Soft/Hard Tip Pens Tear-Off Card Precise Tracing Kaishu Huan'e Tie
$35.70
Foldable Kitchen Sink Dish Drying Rack - Silicone Roll-Up Mat and Countertop Organizer
$25.40
Rapid Folding Shopping Cart, Small Trolley for Stairs, Lightweight Portable Home Handcart, Supermarket Pushcart and Vegetable Basket
$178.39
Over-Toilet Storage Rack - No-Drill Toilet Paper Holder with Multi-Compartment Shelves for Wet Wipes and Aromatherapy
$19.71
![[Youxin Electronics] Soil Moisture Meter Detection Module, Soil Moisture Sensor for Intelligent Robot Cars](https://www.gosteppe.com/cache/medium/product/3877/legacy-main-eca7a3fa750966e5dca86bbf.webp)
![[Puzhong Brand Store] 51 Microcontroller Learning Board Development Board Jiangxie Tech STC89C52 DIY Kit](https://www.gosteppe.com/cache/medium/product/1885/legacy-main-0474e8371f211cc54ab452b5.webp)
![[Corrosion-Resistant] DFRobot Capacitive Soil Moisture Sensor Module Dry/Wet Detection](https://www.gosteppe.com/cache/medium/product/3259/legacy-main-2f0d3454b36b32391d263648.webp)
