Skip to product information
1 of 6


M420T DO or Relay Module

Regular price $172.99 USD
Regular price Sale price $172.99 USD
Sale Sold out
Tax included.

M420T Ethernet Remote I/O Module

The M420 Ethernet Remote I/O module provides 16 digital outputs and supports 10Hz~300Khz high speed pulse output or relay outputs. All the I/Os with high sampling frequency and special filtering strategy to ensure their reliability.


The M420 Ethernet Remote I/O Module is an industrial class, isolated designed, high reliability, high stability and high precision data acquisition module. It features an embedded 32-Bit High Performance Microprocessor MCU and an Integrated 1 Industrial 10/100M adaptive Ethernet module inside. It provides multiple I/O, supports standard Modbus TCP, can be intergraded into a SCADA, OPC server, and other automation systems. It is designed for working in harsh industrial environments and is widely used in a variety of industrial automation, security monitoring systems, automatically measurement and control systems. 

The M420 Ethernet Remote I/O module provides a RS485 interface, through the RS485 bus, it can cascade Modbus RTU I/O devices or Modbus RTU meters, e.g.: a variety of digital input or digital outputs, analog inputs or outputs, thermal resistance IO module combination, save costs. At the same time, the Ethernet Remote I/O module has a register mapping function, the cascade Modbus RTU I/O data are automatically collected to the mapping memory area, the Modbus TCP Client query without waiting then can get a quick response to meet the industrial timely requirements. 
The M420 Ethernet Remote I/O module provides 16 digital outputs, supports 10Hz~300Khz high speed pulse output or relay outputs. All the I/O with high sampling frequency and special filtering strategy to ensure its reliability. 



1. Embedded 32-Bit High Performance Microprocessor MCU, inbuilt watchdog. 
2. Wide range power supply 12 ~ 36VDC with over voltage and phase-reversal protection. 
3. Management and configuration via LAN connection configuration software for effortless operation and maintenance. 
4. Integrated 10/100M adaptive Ethernet module, supports Modbus TCP protocol. 
5. 16 digital output or relay output, supports 10Hz~300KHz high speed pulse output. 
6. High sampling frequency and special filtering strategy to ensure reliability. 
7. 1 RS485 Serial port, supports Modbus RTU/ASCII Master, can extend I/O modules. 
8. Supports register mapping function and extends I/O inquiry strategy. 
9.Provides 1 channel 12~36VDC power source output for external device, saving wiring cost. 
10.LED instructions work status, with reset button to reset, easy on-site installation and commissioning. 
11.Using metal shell, protection class IP30. Metal shell and system security isolation, especially suitable for industrial applications in the field. 
12.Small size, L105mm (about 4.13 in) * W88mm (about 3.46 in) * H30mm (about 1.18 in), compatible wall installation and DIN35mm (about 1.38 in) industrial rail installation. 


Digital Input

Sensor Type Sink
I/O Mode
DO or Pulse Output
Pulse Output Frequency
10Hz~300KHz(Only the 1st Channel can be used as high speed pulse outputs)
Over-Voltage Protection
Over-Temperature Shutdown
175ºC (typical), 150ºC (min.)
Load Current
Max. 500 mA per channel
Digital Sampling Frequency
If DO is Sink type, then no isolation. If it is Relay, then is electrical isolation


Working Power Requirements

Input Voltage

12 to 36 VDC, Peak Voltage; +40VDC

Power Consumption: Less Than 3W

Input Current 139mA @24VDC


Power Output

Output Voltage

12 to 36 VDC
Output Current 139mA @ 24 VDC



Ethernet 10/100Mbps RJ45 ports
Protection 15KV ESD Protection
Protocols Modbus TCP, TCP/IP, MQTT, TCP Server, TCP Client
Max TCP Connection 5


Serial Port

RS485 MODBUS- RTU Protocol, Modbus-ASCII Protocol
Protection 15KV ESD Protection
Modbus Slave Address 1-255
Baud Rate 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 128000Bps
Mapping Registers Bit Type: 300 Registers, 16-Bit Type: 300 Registers


Physical Characteristics

Wiring I/O Cable Max. 14AWG
Dimensions 105mm x 88mm x 30mm
Weight Under 205grams
Mounting DIN Rail or Wall


Environmental Limits

Operating Temperature

Standard Model: -10 to 60°C (14 to 140°F)

Wide Temp. Models: -40 to 75°C (-40 to 167°F)

Storage Temperature -40 to 85°C (-40 to 185°F)
Ambient Relative Humidity 5 to 95% (non-condensing)
Altitude Up to 3000m



M420T - Data Sheet Download

M420T User Manual


Typical applications: 

  1. BTS Monitoring.
  2. Security Alarm System applications.
  3. Supervision and monitoring alarm systems.
  4. Automatic monitoring system.
  5. Vending Machines security protection.
  6. Pumping Stations, Tanks, Oil or Water levels.
  7. Buildings and Real Estate.
  8. Weather Stations.
  9. River Monitoring and Flood Control.
  10. Oil and gas pipelines.
  11. Corrosion protection.
  12. Temperatures, water leakage applications.
  13. Wellheads, boat, vehicle.
  14. Energy saving, streetlights control system.
  15. Valve controls.
  16. Transformer stations
  17. Unmanned machine rooms.
  18. Control room application.
  19. Automation System, M2M.
  20. Access Control System.
  21. 21. PLC Gateway, PLC Remote Monitoring.

Get A Custom Quote