Best Io Modules 2026

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Last Updated - 15.05.2026

Best Choice

01

Waveshare

Waveshare Compute Module 5 IO Board, Compatible with All Variants of Raspberry Pi CM5, with PoE Feature, Bundle with PoE Base Board + Case + Power Supply Adapter

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9.7

Exceptional

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Standard CM5 socket and Raspberry Pi 40PIN GPIO header suitable for all variants of Compute Module 5
Rich WiKi Resources: We provide official Wiki resources, please contact us for more information.
Providing both network connection and power supply for your Raspberry Pi in one cable
ONboard Connectors Including MIPI / M.2 / HDMI / USB / ETH / TF Card Slot.each cut-out is completely aligned with the connector
Faster reading/writing speed compared to the TF card slot of Raspberry Pi, greatly improving reading/writing efficiency of the system or files, support booting Raspberry Pi from NVMe Solid State Drive

69,99 €
Value for Money

02

EBYTE

EBYTE 4DI + 4AI + 4DO RS485 433M Lora Analog Switch Acquisition Remote IO Module Ethernet M31-AAAX4440G-L Modbus RTU Long Distance

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9.6

Exceptional

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

The M31 series distributed IO host supports Modbus TCP protocol and Modbus RTU protocol for capture control. The device supports simultaneous access of 5 clients and supports function codes 01/02/03/04/05/06/15/16. The product adopts a scalable design in the structure.
Supports installation of positioning holes and guide rails; in distributed IO mode, up to 16 IO expansion modules can be connected
Supports 8 baud rate configurations; supports DHCP and static IP;
RS485 acquisition control I/O; the network port collects and controls I/O and supports 5-way host access; supports custom Modbus address settings
LoRa wireless transmission. 1500ft/433m, 30dbm, can communicate directly with the E90 DTU data transmission radio, support standard Modbus protocol and conversion; Support Modbus TCP/RTU protocol, support various configuration software/PLC/touch screens

63,38 €
03

frient

frient IO Module | Input/Output Module | Smart Home Connectivity Module | Smart Home Interface for Wired Devices | Zigbee | Works with Homey, Home Assistant and SmartThings

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9.5

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Requires edge drivers: the IO module works with SmartThings via Edge Driver. These can be downloaded from frient.com – compatible hubs – frients with SmartThings Edge.
HUB REQUIRED: This Zigbee friend needs a hub to connect to your smart home. The IO module works with Homey, Home Assistant, SmartThings and other Zigbee certified hubs. An overview of all compatible hubs is available on the frient website. Not all functions are supported by all hubs.
Connect your wired devices to your smart home and control them remotely.
Compatible with other Zigbee devices.
Add your wired electrical devices to smart home automations.

59,80 €
04

Waveshare

Waveshare Industrial 8-Ch Digital Input & Output Module, DC 7~36V Wide Voltage Power Supply, Modbus RTU Protocol, Multiple Isolation Protection Circuits, Rail-Mount Support

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9.4

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

The output utilizes Darlington transistors with optocoupler isolation, provides stronger driving capability with up to 500mA sinking current, built in flyback diode protection. Rail-mount case design, support stacking combination, easy to install and safer to use
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 magnetic 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 & anti-electrostatic
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. Multiple LEDs for indicating the input & output status, MCU status and signal transceiving status
Configurable device address (1~255), multi devices can be cascaded on RS485 bus. Supports passive and active digital input, with bi-directional optocoupler isolation, built in debouncing algorithm. Supports DI/DO linkage control or DO toggle control

36,99 €
05

Waveshare

Waveshare 8-Ch Ethernet Relay Module, Modbus RTU/Modbus TCP Protocol, PoE Port Communication, with Various Isolation and Protection Circuits, Industrial Grade Rail-Mount Case

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9.3

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

This Modbus POE ETH Relay is very easy to use. Due to its fast communication, stability, reliability, and safety, it is an ideal choice for industrial control equipments and/or applications with high communication requirements
Supports relay control through MQTT protocol, comes with Alibaba Cloud MQTT application demo. Onboard Optocoupler isolation, prevent the relay from being interfered by high-voltage circuit. Reverse-proof circuit, prevent the circuit from being damaged accidentally by incorrect connection
Supports DC 7~36V wide range power input and PoE power supply. Features flash-on, flash-off function, by passing argument to the command, it is possible to turn on the relay for a while and then close it automatically
Rail-mounted ABS case, easy to install, safe to use. 4 LEDs and Network indicators for indicating the MCU status and signal transceiving status. High-quality relay, contact rating: ≤10A 250VAC/30VDC
An industrial 8-ch relay module controlled via Ethernet port, adopts Modbus RTU/Modbus TCP protocols, supports PoE power supply, also comes with an ABS rail-mount case

54,99 €
06

EBYTE

8DI+8DO Remote IO Module RS485 Ethernet RJ45 M31-AXAX8080G Analog Switch Detection Modbus RTU Firmware Upgrade Host Max. 16 Expansion Modules

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9.2

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

The M31 series distributed IO host supports Modbus TCP protocol and Modbus RTU protocol for capture control. The device supports simultaneous access by 5 clients and supports function codes 01/02/03/04/05/06/15/16. The product adopts a scalable design in the structure.
Supports the installation of positioning holes and guide rails; when using the distributed IO mode, up to 16 IO expansion modules can be connected;
Supports standard Modbus RTU protocol and Modbus TCP protocol and conversion; Support Modbus TCP/RTU protocol. Supports various configuration software/PLC/touch screens
Supports 8 baud rate configurations; supports DHCP and static IP;
RS485 acquisition control I/O; the network port collects and controls I/O and supports 5-way host access; supports custom Modbus address settings

53,02 €
07

EBYTE

EBYTE Remote I/O Module 4DI+4AI+4DO RS485 Ethernet M31-AAAX4440G Modbus RTU Firmware Upgrade Host Max 16 Expansion Modules

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9.1

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Show more
Main highlights

The M31 Series distributed IO host supports Modbus TCP protocol and Modbus RTU protocol for acquisition control. The device supports simultaneous access of 5 clients and supports function codes 01/02/03/04/05/06/15/16. The product features a scalable structure design.
Supports standard Modbus RTU protocol and Modbus TCP protocol and conversion; compatible with Modbus TCP/RTU protocol. Supports various configuration programs/PLCs/touch screens;
Supports installation of positioning holes and guide rails; when using distributed IO mode, up to 16 IO expansion modules can be connected
Supports 8 baud rate settings; compatible with DHCP and static IP;
RS485 control for data acquisition; the network port collects and controls I/O and supports 5-way host access; supports custom Modbus address settings;

49,56 €
08

Waveshare

Waveshare Compute Module 5 IO Board, Compatible with All Variants of Raspberry Pi CM5, with PoE Feature, Single Board Only

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9.0

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Standard CM5 socket and Raspberry Pi 40PIN GPIO header, suitable for all variants of Compute Module 5
Rich WiKi Resources: We provide official Wiki resources, please contact us for more information.
Providing both network connection and power supply for your Raspberry Pi in one cable
Onboard Connectors Including MIPI / M.2 / HDMI / USB / ETH / TF Card Slot.each cut-out is completely aligned with the connector
Faster reading/writing speed compared to the TF card slot of Raspberry Pi, greatly improving reading/writing efficiency of the system or files, support booting Raspberry Pi from NVMe Solid State Drive

46,99 €
09

EBYTE

EBYTE ModBus RTU Serial IO Module RS485 Interface 4DI + 4DO 4 Digital Outputs MA01-AXCX4040 Rail Installation 8~28V DC

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8.8

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

The switching input (DI) supports the modes "rising flange", "falling flange" and "level triggering"; the switching output (DO) supports the modes "level", "pulse" and "tracking"; the output port is equipped with arc extinguishing protection;
Support ModBus RTU protocol; Support various configuration software/PLC/touchscreen; RS485 capture and control IO; DC 8~28V power supply;
MA01-AXCX4040 supports the acquisition of 4-channel sensor switch (DI) inputs converted to a serial port (RS485) and transmitted to a configuration software or PLC. The serial port I/O networking module (also called "Remote IO") that realizes acquisition and control remotely by outputting commands via the serial port to control 4 relay switching outputs (DO). Translated with www.DeepL.com/Translator (free version)
Communication baud rate 1200~115200 (standard 9600), supports custom settings; supports 1~247 slave stations, 5-digit DIP switch can set 1~31 address code, more than 31 can be set by software
4-way switch input DI (dry node); 4-channel switch output DO (relay); switch input (DI) supports counting function;

15,73 €
10

EBYTE

EBYTE RS485 2DI+2AI+2DO ModBus RTU I/O MA01-AACX2220 Network Module Serial Connector for PLC/Touch Display Watchdog

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8.7

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Switch input (DI) supports counting function; switch input (DI) supports rising edge, falling edge and level trigger mode; switch output (DO) supports level mode, pulse mode, follow mode; communication baud rate 1200~115200 (standard 9600), support custom settings
Support Modbus RTU protocol; Support various configuration software/PLC/touch screen; RS485 acquisition and control IO; DC 8~28V power supply
Support 1~247 slave stations, 5 digit DIP switch can set 1~31 address code, more than 31 can be set by software
Development and Test Configuration Tool: https://www.cdebyte.com/pdf-down.aspx?id=1898 User Guide: https://www.cdebyte.com/pdf-down.aspx?id=17
2K switch input DI (dry contact); 2K analog input AI (0~20mA/4~20mA); 2K switch output DO (relay);

14,99 €