Industrial 8-Ch Digital Input & Output Module, DC 7~36V Wide Voltage Power Supply, Modbus RTU Protocol, Multiple Isolation Protection Circuits, Rail-Mount Support
8-Ch Digital Input & Output Module
DC 7~36V Wide Voltage Power Supply
Modbus RTU Protocol
Multiple Isolation Protection Circuits
DI/DO Linkage Control
![](https://www.waveshare.com/img/devkit/accBoard/Modbus-RTU-IO-8CH/Modbus-RTU-IO-8CH-details-1.jpg)
Features At A Glance
This is an industrial grade 8DI / 8DO digital isolated input & output module with RS485 control interface. Supports passive / active input, adopts Modbus RTU protocol with built-in protection circuits such as power isolation, magnetical isolation, resettable fuse, and TVS.
- Configurable device address (1~255), multi devices can be cascaded on RS485 bus
- Onboard voltage regulator, supports 7~36V wide range power supply
- Onboard unibody power supply isolation, provides stable isolated voltage, needs no extra power supply for the isolated terminal
- Onboard unibody magnetical isolation, allows signal isolation, high reliability, strong anti-interference
- Onboard resettable fuse and TVS (Transient Voltage Suppressor), effectively suppresses surge voltage and transient spike voltage in the circuit, provides over-current/over-voltage proof, lightningproof & anti-electrostatic
- Supports passive and active digital input, with bi-directional optocoupler isolation, built in debouncing algorithm. Supports DI/DO linkage control or DO toggle control
- The output utilizes Darlington transistors with optocoupler isolation, provides stronger driving capability with up to 500mA sinking current, built in flyback diode protection
- Features flash-on, flash-off function, by passing argument to the command, it is possible to turn on the output for a while and then close it automatically
- Rail-mount case design, support stacking combination, easy to install and safer to use
- Multiple LEDs for indicating the input & output status, MCU status and signal transceiving status
Specifications
COMMUNICATION INTERFACE | RS485 |
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BAUD RATE | 4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000 |
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DEFAULT COMMUNICATION FORMAT | 9600, N, 8, 1 |
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MODBUS PROTOCOL | Standard Modbus RTU protocol |
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POWER SUPPLY | DC 7~36V |
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DIGITAL INPUT | 8DI, 5~36V, passive / active input (NPN or PNP), built-in bi-directional optocoupler isolation |
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DIGITAL OUTPUT | 8DO, 5~36V, open-drain output, output load: 500mA per channel (MAX) |
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Primary Function
Supports Reading Digital Input By Sending Modbus RTU Protocol Commands Via RS485 For Digital Output Control
![](https://www.waveshare.com/img/devkit/accBoard/Modbus-RTU-IO-8CH/Modbus-RTU-IO-8CH-details-3.jpg)
Industrial Grade Isolated Protection
Onboard power and signal dual isolation for RS485 communication, provides stable isolation voltage, features high reliability and strong anti-interference performance. Built-in TVS (transient voltage suppression tube) can effectively suppress the surge voltage and transient peak voltage in the circuit, lightningproof & ESD protection. Built-in resettable fuse and protection diode to ensure stable current and voltage output, provides over-current and over-voltage proof, improves shock-proof performance, suitable for industrial environments with high requirement.
![](https://www.waveshare.com/img/devkit/accBoard/Modbus-RTU-IO-8CH/Modbus-RTU-IO-8CH-details-5.jpg)
Interface Introduction
![](https://www.waveshare.com/img/devkit/accBoard/Modbus-RTU-IO-8CH/Modbus-RTU-IO-8CH-details-7.jpg)
Full Isolation For Digital Input & Output
Supports Passive And Active Digital Input (PNP Type Or NPN Type), With Bi-Directional Optocoupler Isolation. Adopts Darlington Transistor Open-Drain Output, Up To 500mA Sinking Current Per Channel For Directly Driving Relays
![](https://www.waveshare.com/img/devkit/accBoard/Modbus-RTU-IO-8CH/Modbus-RTU-IO-8CH-details-9.jpg)
Multiple Modes For Various Automation Scenarios
Supports Multiple Output Control Modes, Each Channel Supports Independent
Control Mode Setting
![](https://www.waveshare.com/img/devkit/accBoard/Modbus-RTU-IO-8CH/Modbus-RTU-IO-8CH-details-12.jpg)
Wide Voltage Power Supply, Isolated RS485 Interface
Built-In Fuse And Anti-Reverse Protection, With Power And Signal Dual Isolation
![](https://www.waveshare.com/img/devkit/accBoard/Modbus-RTU-IO-8CH/Modbus-RTU-IO-8CH-details-13.jpg)
Rail-Mount Support
Supports 35mm Standard Guide Rail, With Rail-Mount Buckle, Easy To Install
![](https://www.waveshare.com/img/devkit/accBoard/Modbus-RTU-IO-8CH/Modbus-RTU-IO-8CH-details-15.jpg)
Supports Stacking Installation
![](https://www.waveshare.com/img/devkit/accBoard/Modbus-RTU-IO-8CH/Modbus-RTU-IO-8CH-details-17.jpg)
Product Show
![](https://www.waveshare.com/img/devkit/accBoard/Modbus-RTU-IO-8CH/Modbus-RTU-IO-8CH-details-19.jpg)
Dimensions
![](https://www.waveshare.com/img/devkit/accBoard/Modbus-RTU-IO-8CH/Modbus-RTU-IO-8CH-details-size.jpg)
PACKAGE CONTENT
Weight: 0.141 kg
The power supply of this product is not included, it is recommended to purchase
12V power supply if you need it.
Package Contains
- Modbus RTU IO 8CH x1
- Power supply terminal adapter x1
- Screwdriver x1