Modbus simulator

main.js

var mode = "Stop"
var encoder1 = 0
var encoder2 = 0
var step = 0
var down = true
var interval_id = null

function main(){
	mode = "Stop"
	encoder1 = 0
	encoder2 = 0
	interval_id = setInterval(bajada, 4000) //Bajar cada 4 segundos
}

function bajada(){
	if(mode === "Stop"){
		down = false
		encoder1 += 1
		mode = "Down"
		console.log("Down")
		console.log(encoder1, encoder2)
	}
	else if(mode === "Down"){
		if(encoder1 === 10 && encoder2 === 10){
			down = true
			mode = "Up"
			console.log("Got all the way down")
			clearInterval(interval_id)
			subida()
			return
		}
		if(encoder1 < 10) encoder1++
		if(encoder2 < 10) encoder2++
		console.log(encoder1, encoder2)
	}
}

function subida(){
	setTimeout(main, 10000) // Esperar 10 segundos para subir
}

main()

var ModbusRTU = require("modbus-serial");
var vector = {
    getInputRegister: function(addr, unitID) {
		return addr; 
	},
    getHoldingRegister: function(addr, unitID) {
		if(addr === 1000)
			return encoder1 * 1024
		else if(addr === 1004)
			return encoder2 * 1024
		else
			return addr + 8000; 
	},
    getCoil: function(addr, unitID) { 
		if(addr == 0) 
			return down
		else 
			return (addr % 2) === 0; 
	},
    setRegister: function(addr, value, unitID) {
		console.log("set register", addr, value, unitID); return;
	},
    setCoil: function(addr, value, unitID) {
		console.log("set coil", addr, value, unitID); return; 
	}
};

// set the server to answer for modbus requests
console.log("ModbusTCP listening on modbus://0.0.0.0:8502");
var serverTCP = new ModbusRTU.ServerTCP(vector, { host: "0.0.0.0", port: 8502, debug: true, unitID: 1 });