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RS-485用三根线和仪器相连

硬件: Serial>>RS-485

问题: 我的仪器是和RS-485兼容的，但是只有三根线：发送，接收和地。当配置NI串口卡的时候，只允许设置成两线或是四线的收发方式。那么，我应该把它设置为哪种方式呢？仪器应该怎么样连接呢？

解答: 对于485仪器来说，只有三根线是非常常见的，特别是那些同时兼容RS-232和RS-485的仪器。你可以将收发模式设置成四线模式并作下列的连接：

RS-485 串口	仪器
Transmit +	Transmit
Transmit-	Gnd
Receive+	Receive
Receive-	Gnd

相关链接: 产品手册: Serial Hardware and Software for Windows User Manual

附件:





报告日期: 11/05/2002
最近更新: 04/16/2004
文档编号: 2R4H9OWH

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