厦门仲鑫达科技有限公司

  RS-485标准也是一种平衡传输方式的串行接口标准，它和RS-422A兼容并且扩展了RS-422A的功能。
RS-485的电气特性：逻辑“1”以两线间的电压差为＋(2－6)V表示；逻辑“0”以两线间的电压差为-(2-6)V表示。接口信号电平比RS-232C降低了，就不易损坏接口电路的芯片，且该电平与TTL电平兼容，可方便与TTL电路连接。数据最高传输速率为10Mbps。RS-485接口是采用平衡驱动器和差分接收器的组合，抗共模干扰能力增强，即抗干扰性好。RS-485接口的最大传输距离标准值为4000英尺，实际上可达3000米。RS-485接口在总线上是允许连接多达128个收发器，具有多站能力，用户可以利用它建立起设备网络。RS-485接口由于具有良好的抗干扰性、传输距离长和多站能力等优点使其成为首选的串行接口。
 
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