无线数据通讯系统采用SA68D11无线数传模块接收来自地面系统的命令，并向地面系统发送机车状态参数。
The former receives the orders from wayside system by radio data module SA68D11 and delivers locomotive's state informations to wayside system;
本发明还公开数据重传方法、发送机、接收机和数据传输系统。
The invention also discloses a data retransmit method, sender, receiver and data transmission system.
本文只不过想说明一下IP数据的结构和发送机制。
This paper is merely to point out the IP data structure and delivery mechanism.
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