modbus-RTU报文结构 const buffer = Buffer.from(msg.payload , 'hex'); const array = Array.from(buffer); temperature=buffer.readInt16BE(3)/10 //温度 humidity=buffer.readInt16BE(5)/10 //湿度 msg["temperature"]=temperature msg["humidity"]=humidityreturn msg;串口监控配置，需设置闲置时间 ...
以下代码以数组的形式读取日志文件,计算出七天前的 UNIX 日期代码,然后循环访问日志文件中的最后七个时间戳。 12345678910111213141516171819202122232425//Turn incoming timestamps log into an array:var exercisearray = msg.payload.split("\n");if (exercisearray.slice(-1)[0] === "") exercisearray.length =...
问node.js节点-red-将Base64字符串转换为uint8arrayEN直接上代码： var img = "imgurl";//imgurl ...
Athing, as used in this library, is any device or entity in Node-RED for which you maintain state, trigger off state changes, and/or control. These could be simple devices such as lights and sensors, more complex devices such as thermostats and entertainment devices, or even non-connected ...
Buffer.from(array):返回一个呗array的值初始化的新的Buffer实例(传入的array的元素只能是数字,不然就会自动被0覆盖)。 Buffer.from(arrayBuffer[,byteOffset[,length]]):返回一个新建的与给定的ArrayBuffer共享同一内存的Buffer。 更多内容可以参看:https://nodejs.org/api/buffer.html#static-method-bufferfromarray...
大街网招聘信息另外,虽然名为数组(array),但是其边的元素并不是数字,⽽是msg对象,所以,更贴切的叫法应该是:对象组。 这个例⼦代码如下: 5.2.3通过判断语句进⾏数据分类returnmsg;//⼀个返回值 return[[msg1,msg2,msg3],msg4];//⼀组返回值 ...
constbuffer=Buffer.from(msg.payload,'hex');constarray=Array.from(buffer);temperature=buffer.readInt16BE(3)/10//温度humidity=buffer.readInt16BE(5)/10//湿度msg["temperature"]=temperature msg["humidity"]=humidityreturnmsg; 1. 2. 3.
The function node also allows you to configure it with multiple outputs. Once you’ve configured multiple outputs, you can send multiple messages, one to each output, using an array. First, let’s edit the function node to tell Node-RED that the node will have three outputs, using the no...
arguments(optional)array of arguments for that function returnPromise(optional)a boolean value.trueif the function should return a promise message. See tabulator documentation which commands will return promises example {"payload":{"command":"addData","arguments":[ {"facility":"daemon","facilityCode...
let crcArr=new Array(2) crcArr[0]=parseInt("0x"+crcValue.substring(2,4)); crcArr[1]=parseInt("0x"+crcValue.substring(0,2)); return crcArr } //对应请求报文 [1,3,0,0,0,4,68,9] var buffer = new Buffer([1,3,8,00,01,00,02,00,03,00,04]); ...