1、准备工作
1-1、A300-云腾边缘一体机
商品图片待上传：
商品详情待替换：
1-2、RS232-温湿度传感器及其转接头
设备1：USB转232串口线DB9 :公头螺母款
设备2：DB9黑胶母头+螺杆(HL-MHHJ9F01)
设备3：卡轨温度湿度气压变送器三合一传感器RS232
温湿度气压传感器信息（一般在配套的文档中）
温湿度气压传感器中温度湿度寄存器（保持寄存器）地址：
通信示例（在文末更改Node-Red配置的时候可能会用到）：
1-3、接线说明
注意：232产品接线时，需注意RXD与TXD交叉，并且需要接地。
【+】：电源正，【-】：电源负，A/T：TXD，B/R：RXD。
连接线DB9母头（DB9芯号 信号）
A/T——DB9(2-RXD)
B/R——DB9(3-TXD)
【-】电源地 ——DB9(5-GND)
1-4、使用官方提供的软件对传感器进行测试
上电、USB插入电脑，找到串口号：
右击“我的电脑”；——》“管理”——》“设备管理器”
打开厂家，所提供的Demo程序
2、RS232设备连接A300接口-接线示意图
注意：232必须接3条线【RX>TX；TX>RX；GND>电源负】
232必须接3根线（传感器RX接盒子TXD，传感器TX接盒子RXD；另外232必须接地，就是电源负极接-盒子GND）；如上图所示。
3、进入Node-red实例中，进行节点配置
3-1、节点接线图
3-2、节点配置
232-请求(Modbus-请求节点)配置：
串口节点配置：
232解析(Modbus-解析节点)配置：
3-3、测试结果图
3-4、视频演示
此处为语雀视频卡片，点击链接查看：AIoTedge-RS232串口节点+Modbus请求解析.mp4
4、Node-red完整流程代码
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