非屏蔽双绞线这种电缆属于3类，因此不推荐用于工业环境中使用。
Unshielded twisted pair This type of cable belongs to category 3, and is not recommended for use in an industrial environment.
屏蔽双绞线描述了一种电缆的外屏幕，没有任何更紧密地定义了屏幕的性质。
Shielded twisted pair Describes a cable with an outer screen, without defining the nature of the screen any more closely.
485通讯电缆在一般场合采用双绞线就可以，但在要求比较高的环境下可以采用带屏蔽层的双绞电缆。
RS-485 communication cable in general occasion using twisted pair can be, but under the high requirement of environment can be using tape shielded twisted pair cables.
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