Learning Node-RED 2.安装Node-RED

本文详细介绍了如何安装Node.js和Node-RED。首先,通过访问Node.js官网并下载安装包来安装Node.js。接着,使用npm全局安装Node-RED。在CMD中运行node-red启动服务,并在浏览器中访问127.0.0.1:1880以打开编辑环境。此外,还推荐了一个云平台goiot.cc,用户可以在该平台上注册并开启自己的Node-RED服务,获取更多资源和应用。

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安装Node.js

进入Node.js官网,http://nodejs.cn/download/  选择本地操作系统下载安装包,下载.msi文件,运行安装node环境即可。运行cmd,输入node --version && npm --version,会显示相应的版本号。


安装Node-RED

打开cmd窗口,输入命令:npm install -g --unsafe-perm node-red

稍等片刻,Node-RED将会安装成功

运行Node-RED

打开cmd窗口,输入命令:node-red。等待几秒钟即可开启Node-RED服务器,终端会显示出Node-RED的版本号、Node.js版本号和一些Node-RED的必要运行环境目录等。


第一次运行Node-RED可能会卡在Loading palette nodes 或 Missing ENV var CONFIG_PATH就不动了,稍等一会或直接关掉重新运行即可。

此时Node-RED就已经开启,端口号是本地主机的8888,在浏览器中输入http://127.0.0.1:1880/ 便可以打开Node-RED的编辑环境。


云平台

这里推荐https://goiot.cc/ 这个社区,注册帐号进入控制台,即可开启自己的Node-RED服务。当然也有一些别人已经分享出来的基于Node-RED开发的应用。社区中有一些入门资料可以阅读。


### Node-RED OPC UA Integration and Configuration Guide For integrating OPC UA with Node-RED, the `node-red-contrib-opcua` package is essential as it provides nodes specifically designed to interact with OPC UA servers[^1]. Installation of this package can be done through the palette manager within Node-RED or via npm command line tool. #### Installing node-red-contrib-opcua Package To install using npm on a terminal connected to where Node-RED resides: ```bash npm install node-red-contrib-opcua ``` After installation completes successfully, restart Node-RED service so that new components become available inside flows editor interface. #### Configuring OPC-UA Nodes Within Flows Editor Interface Once installed properly, several types of OPC-UA related nodes appear under categories like "input", "output". These include but are not limited to opcua-client-in/opcuaclient-out which allow reading from/writing into specific tags present at remote endpoints exposed by an external system implementing such protocol standards. When configuring these elements visually within flow diagrams provided by platform's web-based UI, ensure correct settings regarding endpoint URL (including security policies), namespace indexes associated with desired items along with authentication credentials if required according to target server specifications. #### Example Flow Demonstrating Basic Usage Below demonstrates how one might set up basic communication between two systems utilizing aforementioned capabilities offered out-of-the-box after adding necessary libraries mentioned earlier. ```json [ { "id": "opcua-read", "type": "OPCUA-IIoT in", "z": "", "name": "", "endpoint": "<your_opc_ua_server_endpoint>", "namespaceIndex": "3", "nodeId": "ns=3;s=MyVariable", "datatype": "float", "topic": "test/topic", "x": 290, "y": 80, "wires": [ ["debug"] ] }, { "id": "debug", "type": "debug", "z": "", "name": "", "active": true, "tosidebar": true, "console": false, "tostatus": false, "complete": "payload" } ] ``` This JSON snippet represents part of a larger workflow definition file used when deploying applications built atop Node-RED framework. It shows setting up an input node configured against hypothetical OPC-UA compliant device accessible over network alongside connecting output destination for logging received data points locally during runtime execution cycle. --related questions-- 1. What are common troubleshooting steps for issues encountered while trying to connect to an OPC UA server? 2. How does one secure communications between Node-RED instances and industrial control systems supporting OPC UA protocols? 3. Can you provide examples demonstrating more advanced features supported by `node-red-contrib-opcua`, such as browsing namespaces programmatically? 4. Is there any official documentation source recommended for learning about best practices concerning implementation patterns involving both technologies together?
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