modbus-event

Modbus-event is a TCP/IP Master, event-driven, implementation for modbus protocol. This package was built upon the great modbus-serial. Make sure to read the methods section to get the best out this module.

Installation

npm i -S modbus-event

Usage

// Require library
var modbusEvent = require('modbus-event');
// Set constructor options
var options = {
    debug : true, // default: false
    ip : '192.168.1.1', // default: '127.0.0.1'
    port : 777, // default: 502
    id : 2 // default: 1
};
var me = modbusEvent(options);
 
// Executes some function in between the reading stage
me.run(function(client, datas, next){
    client.writeCoil(1, 1).then(next);
});
 
// Assign a listener event
me.on('update', function(type, address, newValue, oldValue){
    console.log(type, address, newValue, oldValue);
});

Reference

require('modbus-event')

return Function(options)

Main function of modbus-event

Constructor argument: Options

key	description	type	default
debug	Enable verbosity for debuggin (very handy)	boolean	false
ip	The listenning IP of your Slave Modbus	string	'127.0.0.1'
port	The listenning port of yout Slave Modbus	number	502
id	The SlaveID of your Slave Modbus	number	1
address	Reading address range	Object { init : initial address, length : address range }	{ init : 0, length : 10 }

Sample:

var options = {
    debug : true, // default: false
    ip : '192.168.1.1', // default: '127.0.0.1'
    port : 777, // default: 502
    id : 2 // default: 1
};
var me = modbusEvent(options);

require('modbus-event')(options)

return Object { run : fn, on : fn }

The constructor of modbus-event. Return the following functions:

key	value
run	function(client, data, next)
on	function(event, callback)

require('modbus-event')(options)#run

type Function(client, data, next)

Executes arbitrary code when the serial channel is available. The function arguments are:

argument	description
client	an instance of modbus-serial
data	object containing all addresses and values
next	a function that you need to invoke when done

require('modbus-event')(options)#on

type Function(event, callback)

Assign an event and the respective callback. This are the available events:

update	function(type, address, newValue, oldValue)
triggers when any register is changed	type is the address indentifier ('coils', 'inputStatus', 'holdingReg', 'inputReg')
	address is the changed address in the moment
	newValue is the value before the update
	oldValue is the value after the update

Dependencies

modbus-serial

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License

MIT