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您好：
用非隔离的RS485/422芯片进行数据传输和通信时，由于RS485/422本身就是差分传输，那么发送端和接收端还需要额外的共地吗？或者在什么时候需要共地，共地有什么好处，什么时候不需要？
谢谢您的回答，
