A simple an easy to use Modbus TCP client/server implementation.
Modbus is a simple Modbus TCP/RTU Client/Server with a simple API. It supports modbus function codes 1 - 6 and 15 and 16.
npm install jsmodbus and you are ready to go.
The test files are implemented using mocha and sinon.
npm install -g mocha and
npm install -g sinon. To run the tests type from the projects root folder
Please feel free to fork and add your own tests.
New in Version 3.0.0
We got rid of all the dependencies like stampit and serialport and make extensive use of es6 features like promisses. This way we, the developer do not have any restrictions on how to use this module. Unfortunatly this way the module probably won't work for nodejs versions lower than 6.0.
For modbus rtu we recommend the serialport npm module, for tcp the net.Socket interface is needed. When you need to keep a connection alive with some reconnect logic, use the node-net-reconnect module from our github page https://github.com/cloud-automation/node-net-reconnect.
If you want to see some debugging information, since Version 3 we use the debug module. You can filter the debug output by defining the DEBUG environment variable like so
TCP Client Example
// create a tcp modbus clientconst Modbus =const net =const socket =const client = socket unitIdconst options ='host' : host'port' : port
RTU Client Example
// create a tcp modbus clientconst Modbus =const SerialPort =const options =baudRate: 57600const socket = "/dev/tty-usbserial1" optionsconst client = socket address
Client API Example
// for reconnecting see node-net-reconnect npm module// use socket.on('open', ...) when using serialportsocket;socket
Keeping TCP Connections alive
I've written a module to keep net.Socket connections alive by emitting TCP Keep-Alive messages. Have a look at the node-net-reconnect module.
const modbus =const net =const server =const server = serverserver
Long Running Test Results
We've got a munin server running some scripts. You can find detailed results on jsmodbus.cloud-automation.de.
Copyright (C) 2017 Stefan Poeter (Stefan.Poeter[at]cloud-automation.de)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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