这部分定义对于DNP 数据链路层充当伪传输层的传输层功能。伪传输层功能专门设计用于在原方站和副方站之间传送超出链路规约数据单元(LPDU)定义长度的信息。-definition for this part of the data link layer DNP as pseudo-transport layer transport layer functions. Pseudo-transport layer functions specially designed for the origina