node-red 读写modbus设备数据
报警灯和蜂鸣器2个设备，分别是40001和40002两个地址，可读可写右侧switch按钮显示读取的状态，读取值为0时显示关闭状态，读取值为1时显示打开状态右侧switch按钮点击时，发送点击后的状态值到设备，打开发送数值1，关闭发送数值0。
·
功能界面
modbus功能码
功能简介
报警灯和蜂鸣器2个设备，分别是40001和40002两个地址，可读可写
右侧switch按钮显示读取的状态，读取值为0时显示关闭状态，读取值为1时显示打开状态
右侧switch按钮点击时，发送点击后的状态值到设备，打开发送数值1，关闭发送数值0
安装需要的插件
node-red程序
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]程序讲解
Modbus-Read 节点
Modbus-Read 节点 的 两个出口
两个输出口输出的内容差不多，第一个将读取的内容封装在payload中输出，第二个将读取的内容封装在values中输出
Output 2 的 输出内容
使用 Modbus-Read 节点 读取的数据 控制switch按钮的开关状态
获取数组中的对应值给下游switch按钮
使用上游给的数据切换switch按钮状态
这里一定要取消 Pass through msg if payload matches valid state: 的勾选状态，
然后选择 Indicator 下拉列表中的 Switch icon shows state of the input 选项
Pass through msg if payload matches valid state: 勾选表示不管是入口有数据过来还是点击按钮触发出口有数据，都会切换switch按钮状态
Pass through msg if payload matches valid state: 取消勾选后，会出来一个Indicator下拉选项，
选项 Switch icon shows state of the input 表示仅仅在节点入口有数据过来时改变switch按钮状态，并且在入口有数据过来时不会触发点击事件，也就是不会触发出口连接的节点
另一个选项 Switch icon shows state of the output ，表示仅仅在switch按钮触发点击事件时切换switch按钮状态
这里选择 Switch icon shows state of the input ，是因为设备的状态（switch按钮的状态）要显示读取数据的状态，而非点击按钮后直接切换switch按钮的状态，点击switch按钮后仅仅是触发Modbus Write节点写数据到设备，等设备数据被修改后，Modbus Read节点读取到切换后的数值才会去改变switch按钮的状态，这样switch按钮显示的才是真实的设备状态
还有一个很重要的原因，选择 Switch icon shows state of the input 模式，入口有数据过来后，不会触发switch按钮的点击事件，这就意味着不会在每次读数据后都触发一次Modbus Write节点；想像一下，如果每次读数据过来，都触发一次写数据，是不是很浪费性能，所以这个选项很关键，切记！！！
switch按钮点击时 触发Modbus Write节点写数据到设备
点击switch按钮切换状态时，分别会发送 1（开启）、0（关闭）两个值到出口
完结
DAMO开发者矩阵，由阿里巴巴达摩院和中国互联网协会联合发起，致力于探讨最前沿的技术趋势与应用成果，搭建高质量的交流与分享平台，推动技术创新与产业应用链接，围绕“人工智能与新型计算”构建开放共享的开发者生态。
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