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What is a DTU? DTU is one of the most common IoT communication devices we encounter in our daily work. However, most people’s understanding of this device is limited to its basic concept as a data transmission tool. So, what exactly is a DTU? Let’s take the example of the OM302 series industrial DTU from Dongyong Technology to provide a simple introduction. Understanding Data Transfer Units DTU stands for Data Transfer Unit. It’s primarily used as a wireless terminal device that converts between serial data and IP data for transmission over wireless networks. Simply put, DTU typically refers to the lower-level GPRS\/CDMA transmission terminal devices in wireless communications. 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