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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 36478.4-2019 |
Internet of things—Information sharing and exchanging—Part 4:Data interface 物联网 信息交换和共享 第4部分：数据接口 |
China National Standards 4:Data |
 English PDF |
| GB/T 19897.4-2005 |
Automatic Meter Reading System Lower Layer Communication Protocol Part 4:Data link layer using HDLC protocol 自动抄表系统低层通信协议 第4部分：基于HDLC协议的链路层 |
China National Standards 4:Data |
English PDF |
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