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    DTU Data Transmission Unit, Modbus RS485/RS232

    5 out of 5 based on 2 reviews | Write a review
    Data transmission unit adopts ultra-narrowband modulation technology. Built-in power amplifier (PA) and low-noise amplifier (LNA), make the maximum transmit power reach 5W. Transmission distance can be up to 10km, communication interface is RS232/RS485, be adapted to Modbus protocol. Support high-speed continuous uninterrupted data transmission.
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    Delivery date: 6-12 days


    • The series of DTU is suitable for applications with a large amount of data. Data packet length is not limited.
    • Supports power supply device or line pressure mode, and supports 10V~36V power supply. Uses temperature compensation circuit, frequency stability is better than ± 1.5PPM.
    • Power supply reverse protection, over-current protection, antenna surge protection, high reliability, strong anti-interference ability.
    • Powerful software function, all specifications can be set by programming, such as power, frequency, air speed, address IP, etc.
    • Built-in watchdog. Once an exception occurs, module will automatically restart and continue to work according to the original specification settings.

    Note: Before purchasing, please confirm that the frequency band used by the device complies with local laws and regulations.


    Model ATO-E90-DTU (433C30) ATO-E90-DTU (433C33) ATO-E90-DTU (433C37)
    Transmit Power 1W 2W 5W 
    Transmit Distance 3km 5km 10km
    Default Frequency 433MHz 433MHz  433MHz
    Frequency Range 425~450.5MHz
    Channel Spacing 100kHz
    Channels 256, half duplex
    Operation Temperature -40℃~+85℃
    Antenna Impedance 50Ω
    Supply Voltage 10~28VDC
    Transmit Current 308mA 1027mA
    Communication Interface RS323/RS485
    Band Rate Default 9600
    Air Data Rate Automatically adapt to band rate
    Adress Default 0
    Size (H*W*D) 82mm*62mm*25mm 124mm*105mm*25mm
    Certification CE, CCC
    Buffer single input unlimited (band rate≤57600)
    Sub-package Continuous transmission, no subcontracting

    Dimension Drawing (Unit: mm)

    ATO-E90-DTU (433C30) ATO-E90-DTU (433C33)

    Dimension Drawing of Data Transmission Unit Model 433C30/433C33

    Dimension Drawing of Data Transmission Unit Model 433C30/433C33

    ATO-E90-DTU (433C37) 

    Dimension Drawing of Data Transmission Unit Model 433C37

    Dimension Drawing of Data Transmission Unit Model 433C37

    Tips: Data transmission unit (DTU) application.

    Data transmission unit is specially developed for Modbus RS232/RS485 application scenarios. Its unlimited package length can replace communication cables, is the best choice for Modbus wireless upgrade. Data transmission unit, as a communication medium, has a certain scope of application. It provides real-time and reliable data transmission of monitoring signals in private networks under certain special conditions. It has characteristics of low cost, convenient installation and maintenance, strong diffraction capability, flexible network structure, and wide coverage. 

    DTU is suitable for many and scattered and complicated geographical environments. It can be connected to data terminals such as PLC, RTU, rain gauge, liquid level gauge, etc. It is widely used in power, environmental protection, LED information release, logistics, hydrology, meteorology and other industries.

    Existing reviews of DTU Data Transmission Unit, Modbus RS485/RS232
    Reliable data transmission unit
    I have been using this DTU data transmission unit for almost a month. It is compact and easy to install, with a simple interface that allows me to configure and monitor my data transmissions. And it also provides advanced security features such as data encryption and secure authentication, ensuring that my data is protected from unauthorized access.
    From: Eden | Date: 23/02/2023
    Was this review helpful? Yes No (0/0)
    Very practical DTU!
    I bought this data transmission unit weeks ago. It works great so I write this rating. This little DTU is simple to use but very helpful. If you need one and it is a good one. The quality is great  and the price is reasonable.
    From: Mike | Date: 24/03/2022
    Was this review helpful? Yes No (0/0)
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