通过Node-RED 将RS485 4路继电器接入HA,带状态反馈
本帖最后由 youhaishan 于 2018-4-14 22:07 编辑通过向群里各位大神的学习，及测试，终于实现RS485 4路继电器板接入HA控制并实现状态反馈，目前只找到通过字符串反馈的方法，16进制数据反馈的暂时没学会怎么判断（群里如有Node js的高手望指点下），控制采用的是继电器板16进制的协议进行控制。
设备连接
机械面板接4路继电器板的IO输入口，继电器RS485接网络模块的RS485接口，网络模块接入网络。（设备都是网上淘的）
接入原理
HA采用的是MQTT协议，Node-RED上设置MQTT组件与HA通信，设置TCP Server服务，网络模块工作方式设置为TCP Client连接到TCP Server进行通信。Node-RED上用 switch 进行判断，function进行数据转换，change进行状态反馈。
控制原理
HA通过MQTT将OFF、ON指令反馈到Node-RED MQTT组件，Node-RED接收到OFF\ON指令后转换成继电器的控制协议发送到网络模块上，网络模块在发送到继电器板上实现控制。
反馈原理
当继电器状态改变时，将相对应的字符串状态信息发送到TCP Server，switch 进行判断后通过change将OFF\ON反馈到MQTT。
Node-RED代码
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前来膜拜楼主…… Node-RED的应用应该还很宽广，比如plc的控制接入，希望坛里大神继续研究开发 膜拜楼主！好文章啊！！ 好文章！！！希望楼主视频来一个！！ 这个太SIX，感谢大腿 你好，请问继电器与机械开关是怎样一个关系，或者是怎样连接的呢？
膜拜大神！支持原创 如果用N1 只能通过TCP/IP?
tanghuafu 发表于 2018-8-24 19:40
如果用N1 只能通过TCP/IP?
N1没485接口吧，你就买个网络模块转换下