Hi guys,
Hoping someone can help, I have a flow that I am having difficulty with, It is fairly simple:
I send a hex code requesting some energy data from a meter through a serial request node and I get an ASCII string in return and I need to extract the data for voltage, current , frequency ect. I have matlab code that outlines a working structure but I dont know how to parse the string, I have tried parseInt but my syntax is wrong? Essentially i need to emulate the hex2dec funcitons from the matlab code below but I dont know how to add bytes of data together also.
Working Matlab Code:
clear all
% Set up the serial port
SerialObj=serial('COM11');
set(SerialObj,'BaudRate',9600)
set(SerialObj,'parity','none')
set(SerialObj,'databit',8)
set(SerialObj,'stopbit',1)
set(SerialObj,'Timeout',1)
% Open the serial port for coms
fopen(SerialObj)
% use to open the meter coms
A1=['FE';'FE';'FE';'FE';'68';'99';'99';'99';'99';'99';'99';'68';'23';'0A';'60';'00';'34';'12';'78';...
'56';'BC';'9A';'F0';'DE';'2B';'16'];
A1_dec = hex2dec(A1);
fwrite(SerialObj,A1_dec,'uint8');
S1=fread(SerialObj,18);
% use to read phase 1 data
A2=['FE';'FE';'FE';'FE';'68';'99';'99';'99';'99';'99';'99';'68';'23';'02';'61';'00';'EC';'16'];
A2_dec = hex2dec(A2);
fwrite(SerialObj,A2_dec,'uint8');
S2=fread(SerialObj,47);
% Extract meter data into values
Voltage1=hex2dec([dec2hex(S2(18,1)),dec2hex(S2(17,1))])/100
Current1=hex2dec([dec2hex(S2(20,1)),dec2hex(S2(19,1))])/1000
ActivePower1=hex2dec([dec2hex(S2(24,1)),dec2hex(S2(23,1)),dec2hex(S2(22,1)),dec2hex(S2(21,1))])/100
ReactivePower1=hex2dec([dec2hex(S2(28,1)),dec2hex(S2(27,1)),dec2hex(S2(26,1)),dec2hex(S2(25,1))])/100
ApparentPower1=hex2dec([dec2hex(S2(32,1)),dec2hex(S2(31,1)),dec2hex(S2(30,1)),dec2hex(S2(29,1))])/100
PowerFactor1=hex2dec([dec2hex(S2(34,1)),dec2hex(S2(33,1))])
Frequency1=hex2dec([dec2hex(S2(36,1)),dec2hex(S2(35,1))])/100
PhaseAngle1=hex2dec([dec2hex(S2(38,1)),dec2hex(S2(37,1))])/100000
pause(0.1)
Node-Red flow:
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msg.payload.toString('hex')};","outputs":"1","noerr":0,"x":680,"y":300,"wires":[["fefcf5c1.e55588"]]},{"id":"423e126b.a9497c","type":"function","z":"a9abc99d.b5ce98","name":"Buffer to String","func":"return {payload: msg.payload.toString('hex')};","outputs":"1","noerr":0,"x":680,"y":340,"wires":[["a0656f70.523e3"]]},{"id":"a094a0f0.3bd36","type":"function","z":"a9abc99d.b5ce98","name":"","func":"return [ {payload: new Buffer(msg.payload, \"hex\")}];","outputs":1,"noerr":0,"x":870,"y":300,"wires":[["b0287a4b.c59dc8"]]},{"id":"fefcf5c1.e55588","type":"function","z":"a9abc99d.b5ce98","name":"","func":"return [ {payload: new Buffer(msg.payload, \"hex\")}];","outputs":1,"noerr":0,"x":870,"y":340,"wires":[["b0b52d20.466a8"]]},{"id":"a0656f70.523e3","type":"function","z":"a9abc99d.b5ce98","name":"","func":"return [ {payload: new Buffer(msg.payload, \"hex\")}];","outputs":1,"noerr":0,"x":870,"y":380,"wires":[["5fdf02ee.d0bedc"]]},{"id":"b0287a4b.c59dc8","type":"function","z":"a9abc99d.b5ce98","name":"Hexadecimal to integer","func":"\nVRMS = parseInt(0xB0,16);\n\nIRMS = parseInt(0xB1,16);\n\nVPeak = parseInt(0xB2,16);\n\nIPeak = parseInt(0xB3,16);\n\nFrequency = parseInt(0xB5,16);\n\nActivePower = parseInt(0xB6,16);\n\nReactivePower = parseInt(0xB7,16);\n\nApparentPower = parseInt(0xB8,16);\n\nActiveEnergy = parseInt(0xB9,16);\n\nReactiveEnergy = parseInt(0xBA,16);\n\nApparentEnergy = parseInt(0xBB,16);\n\nreturn [VRMS,IRMS,VPeak,IPeak,Frequency,ActivePower,ReactivePower,ApparentPower,ActiveEnergy,ReactiveEnergy,ApparentEnergy];","outputs":1,"noerr":0,"x":1100,"y":320,"wires":[["f72be214.8c7cb","d77029cc.1021a8"]]},{"id":"8a0e0d5e.30cfd","type":"influxdb out","z":"a9abc99d.b5ce98","influxdb":"84041522.a267b8","name":"","measurement":"Phase 2","precision":"s","retentionPolicy":"","x":1350,"y":400,"wires":[]},{"id":"b0b52d20.466a8","type":"function","z":"a9abc99d.b5ce98","name":"Hexadecimal to integer","func":"\nVRMS = parseInt(0xB0,16);\n\nIRMS = parseInt(0xB1,16);\n\nVPeak = parseInt(0xB2,16);\n\nIPeak = parseInt(0xB3,16);\n\nFrequency = parseInt(0xB5,16);\n\nActivePower = parseInt(0xB6,16);\n\nReactivePower = parseInt(0xB7,16);\n\nApparentPower = parseInt(0xB8,16);\n\nActiveEnergy = parseInt(0xB9,16);\n\nReactiveEnergy = parseInt(0xBA,16);\n\nApparentEnergy = parseInt(0xBB,16);\n\nreturn [VRMS,IRMS,VPeak,IPeak,Frequency,ActivePower,ReactivePower,ApparentPower,ActiveEnergy,ReactiveEnergy,ApparentEnergy];","outputs":1,"noerr":0,"x":1100,"y":380,"wires":[["8a0e0d5e.30cfd"]]},{"id":"98727545.fa1e68","type":"influxdb out","z":"a9abc99d.b5ce98","influxdb":"84041522.a267b8","name":"","measurement":"Phase 3","precision":"s","retentionPolicy":"","x":1350,"y":460,"wires":[]},{"id":"5fdf02ee.d0bedc","type":"function","z":"a9abc99d.b5ce98","name":"Hexadecimal to integer","func":"\nVRMS = parseInt(0xB0,16);\n\nIRMS = parseInt(0xB1,16);\n\nVPeak = parseInt(0xB2,16);\n\nIPeak = parseInt(0xB3,16);\n\nFrequency = parseInt(0xB5,16);\n\nActivePower = parseInt(0xB6,16);\n\nReactivePower = parseInt(0xB7,16);\n\nApparentPower = parseInt(0xB8,16);\n\nActiveEnergy = parseInt(0xB9,16);\n\nReactiveEnergy = parseInt(0xBA,16);\n\nApparentEnergy = parseInt(0xBB,16);\n\nreturn [VRMS,IRMS,VPeak,IPeak,Frequency,ActivePower,ReactivePower,ApparentPower,ActiveEnergy,ReactiveEnergy,ApparentEnergy];","outputs":1,"noerr":0,"x":1100,"y":440,"wires":[["98727545.fa1e68"]]},{"id":"d77029cc.1021a8","type":"debug","z":"a9abc99d.b5ce98","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":1310,"y":600,"wires":[]},{"id":"631eb7d6.2eba28","type":"inject","z":"a9abc99d.b5ce98","name":"OUTPUT SIMULATION","topic":"","payload":"����h������h#¬a� � � XR�W ","payloadType":"str","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":420,"y":480,"wires":[["92f377f.268d088"]]},{"id":"32946f34.c5e3b","type":"serial-port","z":"","serialport":"/dev/ttyUSB0","serialbaud":"9600","databits":"8","parity":"none","stopbits":"1","waitfor":"","dtr":"none","rts":"none","cts":"none","dsr":"none","newline":"47","bin":"bin","out":"count","addchar":"","responsetimeout":"10000"},{"id":"84041522.a267b8","type":"influxdb","z":"","hostname":"[127.0.0.1](https://127.0.0.1/)","port":"8086","protocol":"http","database":"400","name":"Energy","usetls":false,"tls":""}]
