index2.js

var ModbusRTU = require("modbus-serial");
var client = new ModbusRTU();
client.connectRTU("/dev/ttyUSB0", { baudrate: 9600 });
client.setID(1);
setInterval(function () {
    client.readInputRegisters(72, 2, function (err, data) {
        var int32 = data.buffer.readUInt32BE();
        console.log(int32);
    });
}, 1000);

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