jsModbus Tools is a collection of usefull extension to the jsModbus Module.
Install it through npm by typing npm install --save jsmodbus-tools.
Poll certain registers periodically.
var loop = require('jsmodbus-tools').loop;
// loop is a basic tcp modbus client from the jsmodbus module
// with some extra parameters
client = loop({
'host' : someHost,
'port' : somePort,
'loopDuration' : 500, // in ms
'bufferSize' : 4096 // in bytes
});
// loopHoldingRegisters registers the
// start and count values to be polled
client.loopHoldingRegisters(start, count);
// connects the client as usual and starts
// the loop as soon as the connection
// is established
client.connect();
client.on('loopUpdate', function (regs, diffTime) {
// in the registers you can get the requested values
// in the loopHoldingRegister call earlier
// the diffTime parameter indicates how much
// time is left till the next loop
// if the loop took longer than the
// loopDuration value then diffTime will be 0
// Change in Version 0.1.3!! regs are now Buffers!
});
setTimeout(function () {
// stop the loop manually
client.stopLoop();
}, 10000);
setTimeout(function () {
// start the loop manually
client.startLoop();
}, 15000)
Copyright (C) 2016 Stefan Poeter (Stefan.Poeter[at]cloud-automation.de)
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