數(shu)(shu)(shu)(shu)據(ju)傳(chuan)輸單元DTU（Data Transfer Unit）是專(zhuan)門用于將串口數(shu)(shu)(shu)(shu)據(ju)（或(huo)I/O數(shu)(shu)(shu)(shu)據(ju)）轉換為IP數(shu)(shu)(shu)(shu)據(ju)或(huo)將IP數(shu)(shu)(shu)(shu)據(ju)轉換成(cheng)串口數(shu)(shu)(shu)(shu)據(ju)（或(huo)I/O數(shu)(shu)(shu)(shu)據(ju)）通(tong)過(guo)無線(xian)通信網絡進(jin)行傳(chuan)送的(de)無線(xian)終端設備。