To read & save data from serial port (write to .csv file), and plot data as waveform
Hi,
I've been stuck with this problem for weeks and really need some help. I've been searching a lot but I can't find a proper solution.
I am trying to use Labview to plot and display some parameters of a data acquisition system for a project.
The data acquisition system is connected to a computer via serial connection through COM 1 port.
The data acquisition system sends a serial stream of data (ASCII string with baud rate 19200), as shown below (from HyperTerminal),
01:00:26,933.24,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
01:00:27,931.54,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
The serial data stream consists of a time stamp (as 1st data), followed by 16 individual channel data, separated by comma "," and each stream ending in return "\n". Each value of the data ranges from 1 to 6 digits (value of -5000 to 15000).
I have no problem reading this values correctly using HyperTerminal, but I have problem to plot and display individual parameters of this serial string in Labview. I want to save the entire data in a “.csv” file corresponding to all the 16 channels with time stamp and plot each individual channel parameter in a graph with time on X-axis.
I am relatively new to Labview hope I can learn a lot from your help.
Thank you
Thank you Dennis.........
Now I had modified the program incorporating1D array for gauge display.....but currently I have a new problem. The program is running updating the file, waveform graph and Gauge very slowly. Approximately once in every 15 seconds 16 data streams are getting updated in a bunch with gauge sticking to the last value rather than indicating real time value.
eg.
12:33:41,-3728.78,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:42,-3730.47,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:43,-3729.81,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:44,-3733.80,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:45,-3733.57,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:46,-3729.27,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:47,-3725.97,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:48,-3730.14,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:49,-3733.20,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:50,-3733.60,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:51,-3732.24,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:52,-3734.51,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:53,-3728.07,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:54,-3732.54,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:55,-3732.24,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
12:33:56,-3731.58,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,
gets updated in a bunch after 15 seconds, rather than in every second. I thought the problem is with while loop but, i realised there is no delay associated with it..... Can u kindly help me in modifing the program so as it can update the waveform, file data and gauge in real time? (I have attached the modified VI file "suitcase new.vi" and the data gathered after executing the same as in "Trail.txt".)
Thank You,
Rahul
Attachments:
trail.txt 85 KB
suitcase new.vi 44 KB
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growth log.csv 298 KB
Read from growth log.vi 33 KBHello again,
I`m having problems with converting the first column in the attached above file Growth Log.csv.
I have a code converting xl timestamp to time and using Index Array traying to grab a particular column out of it but the attached file is written in strings so I guess I have to redo it in array but I don`t know how.Would you help me with this one?
Attachments:
Xl Timestamp to Time.vi 21 KB -
How to export data from a string to a CSV file
Hello,
i do have a string in a Livecycle Designer script object with a couple of rows with different entries divided by a semicolon:
COLUMN1;COLUMN2;COLUMN3
Entry1;Entry2;Entry3
Entry4;Entry5;Entry6
The goal is now to export this string from Livecycle Designer into a CSV file by clicking a button. Is there any solution suggested?
Thank you very much.Hi,
You can try creating a dataObject and then exporting it, you might get some warning messages popup but try this;
var csvData = "COLUMN1;COLUMN2;COLUMN3\r\n";
csvData += "Entry1;Entry2;Entry3\r\n";
csvData += "Entry4;Entry5;Entry6\r\n";
var pdf = event.target;
pdf.createDataObject("Data.csv", csvData);
pdf.exportDataObject({cName: "Data.csv"});
If you replace the last line with
pdf.exportDataObject({cName: "Data.csv", nLaunch: 2});
It will open in whatever .csv is registered for (Excel on my system)
Regards
Bruce -
Reading data from serial port needs optimisation
Hi,
We have got a class which reads input from some hardware connected to the serial port.
The data coming from the device can cross over 1mb at a time.
We would like to optimize the speed of the program such that no data is lost during the readings.
Hence, we would like to store the entire reading into memory such that it can be stored into a file or database once the readings have been completed.
The serialport class returns a byte[] of the current data in the buffer. There could be over 8000 such readings.
Would it be better to convert the byte[] into a char[] and append into a StringBuffer
or append the byte[] as is into an ArrayList and perform the conversions and operations on it later?
Reg,
ChetanThe ArrayList will not only be much faster but it will preserve the original data. Unless the incoming data really is a String there is no point in converting it.
-
Reading datas from serial port (palm)
Hi,
Because read methods (DataInputStream, stream on palm serial port) are blocking, how do I know if there is at least one available byte that can be read ?
ThanksHi,
I thought the method available() resolve the problem but this method gives the number of byte available without blocking.
I use :
public DataInputStream dis = null;
public int readDataBuf(byte[] buf) {
int status = -1;
try {
if (dis.read(buf, 0, 1) > 0) {
status = (buf[0] & 0xFF);
catch(IOException e) {
System.out.println(e.toString());
return status;
but with the read method if there is not byte the program stop wainting a byte.
Thanks -
Parsing data from Serial Port one byte at a time
Hi everyone,
What I want to do is read in from the serial port byte by byte and parse each byte that I am reading in. The size of the data read in varies. How do I do that? I can do using .dll but I want to learn how to do it in labview. I searched through the forum for something similar but no luck. I have seen some that puts the VISA read in a while loop and others that puts the property node, "bytes at Port" in a while loop. What is the difference in doing either way? I am using Labview 7.1 Can anyone point me in the right direction?
ThanksHi guys..
I'm still a beginner in using labview tcp/ip function. for now, i have a project to read the labview data with java programming language so that i can monitor that data using any devices that using java, such as PC or cell phone. my task for now is to determine the format of data that being sent (its type, length, etc), coz as far as i done until now, the data that read in the java is still a raw material so that i dont know how to gain the information from that data.
my question is :
- how does the type cast work in changing the data format from one to another?
- how does the bytes to read in tcp read work? coz when i'm changing the length of bytes to read constant from 4 bytes to another, the data is becoming mess up. As far as i know, the bytes to read only read the first "constant number" byte in the tcp read to determine the length and type of the data..
thanks
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