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RS485接口OSI模型的应用层
2022-07-16 06:51:00 【成都亿佰特电子科技有限公司】
OSI 模型不是一套规则,而更像是一个帮助工程师表征系统的模型。RS485接口很好地包含在OSI 模型的前三层中,总线的实际实现在应用层中进行了表征。这一层涵盖了设备使用的地址或命令集以及数据的解释。它还包括设计人员期望获得多少数据,以及对总线本身的控制。
例如,CUI Devices 编码器RS485接口的应用程序将是从设备请求绝对位置的主机。当主机发送编码器的位置命令(地址)时,编码器以两个完整字节响应。然后主机解密这些字节以了解绝对位置是什么,同时确定发送命令的频率以及它想要将它们发送到哪些设备。简单来说,应用层就是RS-485总线的实现。

图12:完全定义的 OSI 模型
由于RS-485标准仅定义了具有寻址要求的物理和数据链路层,因此应用层可以采用各种专有或开放的通信协议。工程师可以采用现有的协议,例如Modbus协议,或者他们可以为他们的应用定义自己的传输协议。比如使用CUI Devices 的编码器使用非常简化的寻址结构来断言设备,从而实现快速周转和最短处理时间。每个编码器的地址只有一个字节的高六位,低两位是命令。这允许编码器在来自主机的单个字节后开始响应,从而确保快速周转时间,这在运动控制应用中至关重要。
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