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rtuMaster.js
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var SerialPort = require('serialport').SerialPort;
function SerialModbusMasterRaw(options, callbackOpen) {
var context = this;
this.responseTimeout = options.responseTimeout?options.responseTimeout:1000;
this.responseEndTimeout = options.responseEndTimeout?options.responseEndTimeout:200;
context.serialPort = new SerialPort(options.portName, options.portSetup, false);
context.namePad = (' ' + context.serialPort.path).slice(-26);
context.reqQeue = [];
context.receiveBuffer = new Buffer(256);
context.receiveBuffer.currentPos = 0;
context.receiveBuffer.parts = 0;
context.receiveBuffer.crc = 0xFFFF;
context.requestActive = false;
context.serialPort.open(function(error){
if(error){
console.log(new Date().toISOString() + context.namePad + ' failed to open port');
} else {
console.log(new Date().toISOString() + context.namePad + ' port is opened');
context.serialPort.on('data', function(data) {
if (!context.requestActive) {
console.log(new Date().toISOString() + context.namePad + ' unexpected serial data: ' + data.toString('hex'));
return;
}
clearTimeout(context.responseTimer);
if (context.receiveBuffer.currentPos + data.length < 256) {
data.copy(context.receiveBuffer, context.receiveBuffer.currentPos);
context.receiveBuffer.currentPos += data.length;
context.receiveBuffer.parts++;
context.receiveBuffer.crc = crc16(context.receiveBuffer.crc, data, data.length);
if (context.receiveBuffer.crc === 0) { //make reaction faster on correct telegrams
if ((context.receiveBuffer.currentPos === context.currentRequest.expectedRespLen
&& context.receiveBuffer[1] === context.currentRequest.data[1]) //correct function and response length
|| (context.receiveBuffer.currentPos === 5
&& context.receiveBuffer[1] === (context.currentRequest.data[1] + 0x80))) { //exception length
console.log(new Date().toISOString() + context.namePad + '->' + context.receiveBuffer.slice(0, context.receiveBuffer.currentPos).toString('hex'));
if (context.currentRequest && typeof context.currentRequest.callback === "function") {
context.currentRequest.callback(context.receiveBuffer.slice(0, context.receiveBuffer.currentPos - 2));
}
context.requestActive = false;
}
}
} else {
console.log(new Date().toISOString() + context.namePad + ' serial receive buffer is full');
}
if (context.requestActive) {
context.responseTimer = setTimeout(timeoutEnd, context.responseEndTimeout, context);
} else {
context.currentRequest = undefined;
context._write();
}
});
context.serialPort.on('error', function(error) {
console.log(new Date().toISOString() + context.namePad + ' unknown serial error');
});
}
if(typeof callbackOpen === "function")callbackOpen(error);
});
}
function timeoutEnd(context) {
context.requestActive = false;
console.log(new Date().toISOString() + context.namePad + ' timeout end');
if (typeof context.currentRequest.callback === "function") {
context.currentRequest.callback(new Buffer([context.currentRequest.data[0], context.currentRequest.data[1] + 0x80, 11])); //Return exception target device doesn't respond
context.currentRequest = undefined;
context._write();
}
}
SerialModbusMasterRaw.prototype.request = function(data, callback) {
var context = this;
var expectedRespLen = 0;
switch(data[1]) { //Function code
case 1://Read coils
case 2://Read inputs
expectedRespLen = 5 + Math.ceil(data.readUInt16BE(4) / 8);
break;
case 3://Read holding regs
case 4://Read input regs
expectedRespLen = 5 + data.readUInt16BE(4) * 2;
break;
case 5://Write coil
case 6://Write holding
case 15://Write coils
case 16://Write holdings
expectedRespLen = 8;
break;
default:
console.log(new Date().toISOString() + context.namePad + ' unsupported function code: ' + data[1]);
if (typeof callback === "function") {
callback(Buffer.from([data[0], data[1] + 0x80, 10])); //Return exception path unavailable
}
return;
}
var tmpbuf = new Buffer([0,0]);
var buf = Buffer.concat([data, tmpbuf], data.length+2);
var req = {
data:buf,
callback:callback,
expectedRespLen:expectedRespLen
};
req.data.writeUInt16LE(crc16(0xFFFF, data, data.length), data.length);
if(context.currentRequest) {
context.reqQeue.push(req);
}else{
context.currentRequest = req;
context._write();
}
};
SerialModbusMasterRaw.prototype._write = function() {
var context = this;
if(!context.currentRequest) {
context.currentRequest = context.reqQeue.shift();
}
if(context.currentRequest) {
context.serialPort.write(context.currentRequest.data, function (err, results){
if (err) {
console.log(new Date().toISOString() + context.namePad + ' error writing to serial port: ' + err);
} else {
context.requestActive = true;
context.receiveBuffer.currentPos = 0;
context.receiveBuffer.parts = 0;
context.receiveBuffer.crc = 0xFFFF;
console.log(new Date().toISOString() + context.namePad + '<- ' + context.currentRequest.data.toString('hex'));
context.responseTimer = setTimeout(timeoutEnd, context.responseTimeout, context);
}
});
} else {
//console.log(new Date().toISOString() + ' no pending serial request');
}
};
module.exports = SerialModbusMasterRaw;
var CrcTable = [
0X0000, 0XC0C1, 0XC181, 0X0140, 0XC301, 0X03C0, 0X0280, 0XC241,
0XC601, 0X06C0, 0X0780, 0XC741, 0X0500, 0XC5C1, 0XC481, 0X0440,
0XCC01, 0X0CC0, 0X0D80, 0XCD41, 0X0F00, 0XCFC1, 0XCE81, 0X0E40,
0X0A00, 0XCAC1, 0XCB81, 0X0B40, 0XC901, 0X09C0, 0X0880, 0XC841,
0XD801, 0X18C0, 0X1980, 0XD941, 0X1B00, 0XDBC1, 0XDA81, 0X1A40,
0X1E00, 0XDEC1, 0XDF81, 0X1F40, 0XDD01, 0X1DC0, 0X1C80, 0XDC41,
0X1400, 0XD4C1, 0XD581, 0X1540, 0XD701, 0X17C0, 0X1680, 0XD641,
0XD201, 0X12C0, 0X1380, 0XD341, 0X1100, 0XD1C1, 0XD081, 0X1040,
0XF001, 0X30C0, 0X3180, 0XF141, 0X3300, 0XF3C1, 0XF281, 0X3240,
0X3600, 0XF6C1, 0XF781, 0X3740, 0XF501, 0X35C0, 0X3480, 0XF441,
0X3C00, 0XFCC1, 0XFD81, 0X3D40, 0XFF01, 0X3FC0, 0X3E80, 0XFE41,
0XFA01, 0X3AC0, 0X3B80, 0XFB41, 0X3900, 0XF9C1, 0XF881, 0X3840,
0X2800, 0XE8C1, 0XE981, 0X2940, 0XEB01, 0X2BC0, 0X2A80, 0XEA41,
0XEE01, 0X2EC0, 0X2F80, 0XEF41, 0X2D00, 0XEDC1, 0XEC81, 0X2C40,
0XE401, 0X24C0, 0X2580, 0XE541, 0X2700, 0XE7C1, 0XE681, 0X2640,
0X2200, 0XE2C1, 0XE381, 0X2340, 0XE101, 0X21C0, 0X2080, 0XE041,
0XA001, 0X60C0, 0X6180, 0XA141, 0X6300, 0XA3C1, 0XA281, 0X6240,
0X6600, 0XA6C1, 0XA781, 0X6740, 0XA501, 0X65C0, 0X6480, 0XA441,
0X6C00, 0XACC1, 0XAD81, 0X6D40, 0XAF01, 0X6FC0, 0X6E80, 0XAE41,
0XAA01, 0X6AC0, 0X6B80, 0XAB41, 0X6900, 0XA9C1, 0XA881, 0X6840,
0X7800, 0XB8C1, 0XB981, 0X7940, 0XBB01, 0X7BC0, 0X7A80, 0XBA41,
0XBE01, 0X7EC0, 0X7F80, 0XBF41, 0X7D00, 0XBDC1, 0XBC81, 0X7C40,
0XB401, 0X74C0, 0X7580, 0XB541, 0X7700, 0XB7C1, 0XB681, 0X7640,
0X7200, 0XB2C1, 0XB381, 0X7340, 0XB101, 0X71C0, 0X7080, 0XB041,
0X5000, 0X90C1, 0X9181, 0X5140, 0X9301, 0X53C0, 0X5280, 0X9241,
0X9601, 0X56C0, 0X5780, 0X9741, 0X5500, 0X95C1, 0X9481, 0X5440,
0X9C01, 0X5CC0, 0X5D80, 0X9D41, 0X5F00, 0X9FC1, 0X9E81, 0X5E40,
0X5A00, 0X9AC1, 0X9B81, 0X5B40, 0X9901, 0X59C0, 0X5880, 0X9841,
0X8801, 0X48C0, 0X4980, 0X8941, 0X4B00, 0X8BC1, 0X8A81, 0X4A40,
0X4E00, 0X8EC1, 0X8F81, 0X4F40, 0X8D01, 0X4DC0, 0X4C80, 0X8C41,
0X4400, 0X84C1, 0X8581, 0X4540, 0X8701, 0X47C0, 0X4680, 0X8641,
0X8201, 0X42C0, 0X4380, 0X8341, 0X4100, 0X81C1, 0X8081, 0X4040
];
function crc16(prevCRC, bytes, length){
var crc = prevCRC;
for(var i = 0, l = length; i < l; i++){
crc = ((crc >> 8) ^ CrcTable[(crc ^ bytes[i]) & 0xFF]);
}
return crc;
}