Attributes

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

5 reviews

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.

5 FAQ

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.

Explore your interests

Beikecom ESP32-S3 Core Board (N8R2/N16R8) with Bluetooth/WiFi Module, 44-Pin Xiaozhi Robot

$29.20

Pulse Heart Rate Sensor Compatible Bio-Simulation Sensor Header Pins No Soldering Required

$6.35

[Youxin Electronics] Soil Moisture Meter Detection Module, Soil Moisture Sensor for Intelligent Robot Cars

$2.09

N52 Super Strong Square Magnet, Neodymium Iron Boron Bar Magnet, Powerful Magnetic Blocks

$10.50

Instax Shutter Timer Selfie Artifact Fujifilm instax SQ Series Non-Destructive Installation

$58.00

STM32 Beginner Kit Minimum System Board Electronic Breadboard Same as University Science Association Models

$56.60

lalaci Round N52 Strong Magnet High Performance Powerful Small Magnet Diameter 1/2/3/4/5/6/8 Manufacturer NdFeB

$3.25

Car Vibrator/Piezoelectric Vibration Sensor Motorcycle Anti-Theft Alarm Vibration Sensor Module Ceramic Plate

$13.00

N52 Strong Magnet Small Round Mini Powerful Tiny Magnet High-Performance Neodymium Iron Boron Super Strong Magnet Steel 2-8mm

$5.50

Natural Cinnabar Rose Beads, Purple Gold Sand 'Blooming Prosperity' DIY Bracelet and Ring Accessories, Buddhist Prayer Bead Charms

$1.30

Strong Magnet with Hole Square Magnet Block High-Performance Neodymium Iron Boron Countersunk Hole Magnet Steel Magnet Stone Patch

$0.50

New Stainless Steel Solder Wire Lighter Usable High Purity Tin Wire Universal Welding Tool Soldering Wire

$2.90

New Industrial Iron Picker Iron Sucker Magnetic Quick Magnetic Rod G Parts Manual Magnet Nail Sweeper Simple

$386.24

YwRobot Color LCD Display Module for Arduino with TF Card Slot IPS Screen ST7789

$22.00

Genuine ARDUINO MEGA 2560 R3 A000067 ATmega2560 Development Board Module

$221.50

M03 M04 Water Level Detection Module Sensor, Green Non-Contact Liquid Level Touch Switch

$1.15

MQ-8 Hydrogen Gas Sensor Module

$7.73

MAX30100/MAX30102 Blood Oxygen Heart Rate Wrist Pulse Detection Monitoring Biosensor Module

$5.39

300 SMT Component Soldering Kit High-Intensity Practice Board PCB Skills Competition TJ-56-273

$42.40

Kunlun Coast Industrial Wide-Temperature Transmitter Split Type Temperature and Humidity Sensor JWSK-6

$100.00

Digital + Analog LM386 Sound Detection Sensor Voice Control Switch Audio Waveform Microphone Module

$20.00

Wildfire Zhengtu Pro FPGA Development Board ALTERA CycloneIV EP4CE10F17C8N Image Processing

$502.00

[Puzhong Brand Store] 51 Microcontroller Learning Board Development Board Jiangxie Tech STC89C52 DIY Kit

$69.50

EchoEar MeowMate PCB Development Board Kit Components Espressif Xiaozhi AI Volcengine Open Source Replica

$0.50

Strong Magnetic Rod with Lifting Ring Industrial Magnetic Force 304 Stainless Steel Stable Mining Iron Removal Magnet

$202.00

Thickened Strong Magnetic Rubber Soft Magnetic Sheet A4 Advertising Magnetic Car Sticker, Flexible Magnet with Adhesive Backing, Magnetic Paper

$17.50

[Corrosion-Resistant] DFRobot Capacitive Soil Moisture Sensor Module Dry/Wet Detection

$35.00

(Loose Parts) Photo-Sensitive Light-Controlled Audio-Visual Alarm Kit with Buzzer and Double-Sided PCB Board for Teaching, Training, and Soldering Practice

$6.80

FarSight WS63 NearLink Development Board Hi3863 HarmonyOS OpenHarmony IoT WiFi Bluetooth BLE

$199.00

Raspberry Pi 4 Case Aluminum Alloy Heat Dissipation

$21.90

Anlixin Solder Paste Solder Cream SMT Patch Mobile Phone Repair Reballing LED Welding High Medium Low Temperature Lead-Free Solder Mud

$25.80

Strong Magnetic Suction Patches, Round Neodymium Magnets with Holes, High-Strength Fixed Suction Force

$2.55

Desktop Soldering Fixture for Mobile Phone Repair - Electronic Holding Stand with Soldering Iron Support and Auxiliary Tools

$11.64

GY-530 VL53L0X Laser Distance Sensor ToF Ranging Time-of-Flight Sensor Module

$12.31

SC7A20H 3-Axis Acceleration Tilt Angle Sensor Module, Inclination and Level Detection with Serial Output

$11.35

N52 Strong Magnet Iron Attractor Round Powerful Magnet Magnetic Stone Sheet Neodymium Iron Boron High-Strength Magnet Rare Earth Magnetic Steel Permanent Magnet

$7.07