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CWT4421 4g RS485 Modbus RTU M2M IoT Gateway

Regular price $160.00 USD
Regular price Sale price $160.00 USD
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Product overview

CWT4421 IoT gateway with 4DI, 2DO, 4AI, RS485 standard electrical interface can connect various industrial equipment, such as PLC, meters, sensors, electrical
switches. It monitors the industrial system real-time running status and data, as well as constructs the remote device to a proprietary central computer and mobile phones through the 4g or Wi-Fi communication network. It efficiently acquires the remote equipment operating parameters and process management, can be widely used in industrial automatic control,
base station / computer room monitoring, environmentalmonitoring, water conservancy project, powerindustries,

agriculture, etc.

System Features

  • Adopted highly integrated industrial 32-bit ARM MCU

  • Reliable performance with built-in double watchdog,24×7 operation

  • With signal filtering mechanisms

  • Network-reconnect and retransmission to ensure data accuratelytransmit

  • Update RTC automatically or manually, clock source support Sms, NTP, CwtIO Server

  • Can set multiple timers execute actions, e.g.,output, upload data, change setting

  • Event-based linkage programming, e.g., alarm linkage output

  • Provide configure software, visual programming

  • Support remote update firmware via FTP

  • Optional inside battery that life is 8-20 hours, cellular module Intelligent sleep when power lost

Port Features





(digital input)



(digital output)


  • Transistor output (drive voltage=power supply voltage, Drive current500mA

  • Remote or local event activate DO on/off/pulse

  • Remember status when power lost


(analog input)


  • Accept 4-20mA (option: 0-5V), Sampling frequency: 33Hz, 16-bit precision)

  • Convert signal to actual measure valuesupport adjustment

  • Configurable parameters for signal acquisition, alarm, data communication

  • Detect connect or disconnect to alarm



  • Support Modbus RTU protocol

  • Can work as a Modbus master to read/write 24 data from slaves

  • Can work as a Modbus slave to be read/write by master

Communication Features

Wireless network communication

  • Option network: 4G, Wi-Fi, 4G&Wi-Fi

  • TCP/IP connect at most 4 servers (support Static IP address or domain)

  • Events (e.g., alarm, timer) trigger upload data

  • Communication protocol: Modbus TCPhttp post, Cwt_IO(two-way communication)

  • Support two-way data transparent transmission with RS485

RS485 Modbus


  • Support Modbus RTU protocol

  • Can work as a Modbus master to read/write 24 data from slaves (like meter, PLC, transducer etc.)

  • Can work as a Modbus slave to be read/write by master (HMI, SCADA etc.)

  • Support Modbus RTU to TCP convert over Ethernet or GPRS/3G

2G/4G Version Standard Package


Size diagram

Package list

RTU×1, antenna×1Standard adapter: DC 12V/1.5A×1serial cable×1USB cable×1

CWT Cloud Summary

  CWT cloud is anindustrial equipmentmanagement system based on internet, cloud computing.

  With CWT RTU, CWT cloud can get status, value, position of remote industrial equipment, built a very complete M2M, M2H industrial ecosystem.

  CWT cloud can manage thousands CWT RTU remotely, display all industrial equipment real-time data, location tracking, control device, send commands and store data, analysis data, export data. Operations are based on internet, just login cloud via PC browser or cell phone app to do.

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