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modbus-serial
Advanced tools
A pure JavaScript implemetation of MODBUS-RTU for NodeJS
This class makes ModbusRTU calls fun and easy.
Modbus is a serial communications protocol, first used in 1979. Modbus is simple and robust, openly published, royalty-free and easy to deploy and maintain.
npm install modbus-serial
This class makes it fun and easy to communicate with electronic devices such as irrigation controllers, protocol droids and robots. It talks with devices that use a serial line (e.g. RS485, RS232). Many industrial electronic devices implement modbus. Arduino can also talk modbus and you can control your projects and robots using modbus. Arduino library for modbus slave: https://github.com/smarmengol/Modbus-Master-Slave-for-Arduino
This class implements FC4 (Read Input Registers) and FC16 (Preset Multiple Registers) of modbus-RTU.
node-serialport - for using the serial port. https://github.com/voodootikigod/node-serialport
var SerialPort = require("serialport").SerialPort;
var serialPort = new SerialPort("/dev/ttyUSB0", {baudrate: 9600});
var ModbusRTU = require("modbus-serial");
var modbusRTU = new ModbusRTU(serialPort);
modbusRTU.open();
// write the values 0, 0xffff to registers starting at address 5
// on device number 1.
setTimeout(function() {
modbusRTU.writeFC16(1, 5, [0 , 0xffff]);
}, 1000);
// read the values of 2 registers starting at address 5
// on device number 1. and log the values to the console.
setTimeout(function() {
modbusRTU.writeFC4(1, 5, 2, function(err, data) {
console.log(data);
});
}, 2000);
// close communication
setTimeout(function() {
serialPort.close();
}, 3000);
Opens a modbus connection using the given serial port.
Called when a connection has been opened.
Writes Read Input Registers (FC=04) request to serial port.
The slave unit address.
The Data Address of the first register.
The total number of registers requested.
Called once the unit returns an answer. The callback should be a function that looks like: function (error, data) { ... }
Writes Preset Multiple Registers (FC=16) request to serial port.
The slave unit address.
The Data Address of the first register.
The array of values to set into the registers.
Called once the unit returns an answer. The callback should be a function that looks like: function (error, data) { ... }
FAQs
A pure JavaScript implemetation of MODBUS-RTU (Serial and TCP) for NodeJS.
The npm package modbus-serial receives a total of 5,306 weekly downloads. As such, modbus-serial popularity was classified as popular.
We found that modbus-serial demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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