Do not use twisted pair, is extremely wrong. 485 bus must be hand in hand type bus structure, resolutely eradicate starconnection and branch connection.
不选用双绞线，是极端过错的。485总线一定要是手牵手式的总线结构，坚决根绝星型连接和分叉连接。
2
The connection between bear and star comes from the story in Greek mythology that the nymph Callisto was turned into a bear and placed as a constellation in the heavens by Zeus.
熊和星之间的联系来源于希腊神话中的，女神卡利斯托被宙斯变成了一只熊在天空之变成一座星座。
3
The effect was obvious to select four-starconnection MOA was a main protector to limit overvoltage in operation of a vacuum disconnector.