@chvdapi/node-red-dlt645/PN6400_DLT645.js

a node communicate with DLT645-2007 electric energy meter

const dlt645 = require('./build/Release/dlt645')

module.exports = function(RED) {
    function PN6400_DLT645(config) {
        RED.nodes.createNode(this,config);
        var node = this;
        var item = 0;
        var address = "AAAAAAAAAAAA";//defalut broadCast
        //console.log("path:%s\n" ,config.serialport);
        var instructionName = config.instruction;

        switch (instructionName ) {
            case "energy":
                item  = 1;
                break;
		    case "current":
                item  = 2;
                break;
		    case "voltage":
                item  = 3;
                break;
            case "power":
                item  = 4;
                break;
		    case "factor":
                item  = 5;
                break;
		    case "frequence":
                item  = 6;
                break;
            case "reactivePower":
                item  = 7;
                break;
        }
        if(config.useSelfAddress == true){//unicast
                address = config.selfDefAddress;
                //console.log("unicast address = %s" , address );//
        }
        else{
                //console.log("broadCastaddress = %s" , address );//broadCast
        }
        node.on('input', function(msg) {
            var value = dlt645.readItem(item, config.baudRate, address , config.serialport);
            value = Math.floor(value * 1000) / 1000;
            msg.payload =
            {
                        "item": instructionName ,
                        "value" : value
            }
            node.send(msg);
        });
    }
    RED.nodes.registerType("PN6400_DLT645",PN6400_DLT645);	
}