3、485总线是一种*简单、*稳定、*成熟的工业总线结构
这种概念是错误的。485总线是一种用于设备联网的、经济型的、传统的工业总线方式。。其通讯质量需要根据施工经验进行调试和测试采可以得到保证。485总线虽然简单，但也必须严格按照安装施工规范进行布线。
二、必须严格按照施工规范施工
在485总线系统施工时必须严格按照施工规范施工，特别应注意下面几点。
1、485+和485－数据线一定要互为双绞。
2、布线一定要布多股屏蔽双绞线。多股是为了备用，屏蔽是为了便于出现特殊情况时调试，双绞是因为485通讯采用差模通讯原理，双绞的抗干扰性较好。不采用双绞线是错误的。
3、485总线一定要用手牵手式的总线结构，坚决避免星型连接和分叉连接。
4、设备供电的交流电及机箱一定要真实接地，而且接地良好。有很多地方表面上有三角插座，其实根本没有接地，接地良好可以防止设备被雷击、浪涌冲击。静电累积时可以配合设备的防雷设计较好地释放能量，保护485总线设备和相关芯片不受伤害。

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