EDI消息通过公用数据传输网络或银行系统的渠道传送。
EDI messages are sent through public data transmission networks or banking system channels.
这可能是因为Kindle内置了手机数据传输网络，可以免费免费实现无线上网功能。
This is possible because the Kindle comes with free, built-in wireless Internet access, using a cellular data network.
本文介绍了该系统中数据传输网络的组成、工作原理及数据传输机制，特别是设计独特的RS-232与RS-485之间的无源电平转换接口模块。
The paper introduces the structure, theory and mechanism of data communication net in this system, especially RS232/RS485 passive level conversion module.
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