CiA DR303标准的屏蔽双绞线缆。屏蔽层
内有两对导线分别双绞,其中一对是用来传信号,一对
用来供电。双绞线在线径和阻抗方面的要求如表
2-1所
示。
表 2- 1 电缆要求
总线长度电缆阻抗电缆横截面/规格
最大波特
率( kbps)
0~40 70
0.25~ 0.34(如
AWG24,
AWG22)
1000
40~300 <60
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