Data acquisition via serial port (COM)

Hello,
I want to ask how can I get data from a HP oscilloscope (model 5XXXB)
thru the COM port with labview? By means of serial VI or do I need a driver?
Thank you very much.

thank you very much
"Dennis Knutson" wrote in message
news:[email protected]..
> Looks like your newsreader broke the link into two lines. In any case,
> Chris gave the link to the main instrument driver page. If you can't
> find a driver there or from Agilent, then reply back with the exact
> model number of the instrument. Maybe someone has worked with it. If
> all else fails, then you'll have to get the instrument's programming
> manual, decide which commands you need, and start testing. The easiest
> way I've found to do this with any kind of serial communication is to
> use hyperterminal to test the commands and see how the instrument
> responds. Once you're confident with the instrumen
t's syntax, you can
> start with the LabVIEW code. One thing to keep in mind is that serial
> communication usually requires that each line be terminated. This
> might be a carriage return, line feed, or end of line. Your
> programming manual will tell you what to use.

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Entering data via serial port

how can i enter an analog (and digital) data through a serial Port?

Short answer, you can't. You could, to a limited extent, transfer digital data through the parallel port. There were some other threads that talk about this, here are two.
As is mentioned in one, there are some relatively inexpensive modules from different companies that will do some of what you need. National Instruments is now carrying some interesting USB units that do digital/analog through the USB port, also.
http://forums.ni.com/ni/board/message?board.id=170&message.id=32642&requireLogin=False
http://forums.ni.com/ni/board/message?board.id=170&message.id=77244&requireLogin=False
Putnam Monroe
Putnam
Certified LabVIEW Developer
Senior Test Engineer
Currently using LV 6.1-LabVIEW 2012, RT8.5
LabVIEW Champion

How can i browse FP 2000 via serial port same use Ethernet port(RJ 45)?

I am a new user for labview.I develope my program with FP 2000 but I have some problem
1 How can i browse FP 2000 via serial port same use Ethernet port(RJ 45)? if it can Tell me please.
  2 If I use GSM/GPRS modem via FP 2000 rs 232 port (I under stand how to send AT command) and leave it stand alone
     Can I dial modem and browse file in FP 2000 same as use Ethernetport?
Someone please help me.Thank you very much.

Hi!
    First, I can say that your project involves many things, I cannot describe all features in the forum, and I'm not used with GPRS modems (my modems are base band serial modems...).
    Anyway, I would say that in your project you should proceed like this:
      1) Configure your FP 2000 module via MAX and ethernet connection;
      2) Download an embedded application to your module (build in LabView Real-Time)
      3) In your application, you should build a kind of serial port manager, and by the means of serial port you send/receive commands from PC.
    The commands from PC can include "Tell me the about the FP 2000 file system ", or "switch on line X", or anything you need.
   I think it would be difficult to use Internet exp, because you use IE with TCP/IP, and TCP/IP is over ethernet.
   I know that for Windows you can find some wrappers that make you "see" the serial port as an ethernet, but these wrapper do not exist under filed Point, and you shoul build one yourself!!!(and that's not easy).
    For example, to browse your files, you should build a VI that searches through your file system, and reports, via serial, the files present in a directory (it's an example....).
    About communication between GPRS modems and FP2000, I know nothing. I suppose that these modems accept serial inputs, so you'll have to configure your serial port on FP 2000 with the correct baud rate, parity, and so on..... and you send your data to the modem. The modem will transfer data in its way, no matter on how it does.
    To send data to your modem you shoud take a look to some Serial communication examples. What I suggest you, first, is to connect the serial port of FP2000 to a PC, and test communication between PC and FP2000, without modems. Just direct cable connection! If you're able to do this, insertion of modems is the next step, and should be quite easy. If you're not able to make the PC receive strings of data from FP2000, over RS232, adding modems is a further complication, and you won't come out of this mess!
   So, what I say, is just build, for now, a simple embedded application for FP2000, that, using RS232, sends data to a PC (you should see data sent with use of Hyper terminal).
    To build this application, use Instrument I/O --> VISA commands (VISA open, VISA write, and Property node should be enough, for now).
   Please, let me know if this helps......
    Have a nice (programming) day!
graziano

Problem communicating via serial port in Linux

Hello,
I am trying to transfer data via serial port, in Linux.
But it is impossible till now!
I get Runtime exception.
Here is my code:
public class Main {
    public Main() {
    int num=5;
    int[] array = new int[5];
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                array[0]=1;
                array[1]=2;
                array[2]=3;
                array[3]=4;
                array[4]=5;
                new ParallelCommunication(num,array);
import java.io.*;
import java.util.*;
import javax.comm.*; // for SUN's serial/parallel port libraries
//import gnu.io.*; // for rxtxSerial library
public class ParallelCommunication implements Runnable, SerialPortEventListener {
   static CommPortIdentifier portId;
   static CommPortIdentifier saveportId;
   static Enumeration portList;
   InputStream inputStream;
   SerialPort serialPort;
   Thread readThread;
   static OutputStream outputStream;
   static boolean outputBufferEmptyFlag = false;
   int num;
   int[] array;
   public ParallelCommunication(int this_num,int[] this_array) {
      boolean portFound = false;
      String defaultPort;
      num = this_num;
     array=new int[this_array.length];
      array = this_array;
      // determine the name of the serial port on several operating systems
      String osname = System.getProperty("os.name","").toLowerCase();
      if ( osname.startsWith("windows") ) {
         // windows
         defaultPort = "COM1";
      } else if (osname.startsWith("linux")) {
         // linux
        defaultPort = "/dev/ttyS0";
      } else {
         System.out.println("Sorry, your operating system is not supported");
         return;
//      if (args.length > 0) {
//         defaultPort = args[0];
      System.out.println("Set default port to "+defaultPort);
      // parse ports and if the default port is found, initialized the reader
      portList = CommPortIdentifier.getPortIdentifiers();
      while (portList.hasMoreElements()) {
         portId = (CommPortIdentifier) portList.nextElement();
         if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
            if (portId.getName().equals(defaultPort)) {
               System.out.println("Found port: "+defaultPort);
               portFound = true;
               // init reader thread
               initialize();
               break;
      if (!portFound) {
         System.out.println("port " + defaultPort + " not found.");
   public void initwritetoport() {
      // initwritetoport() assumes that the port has already been opened and
      //    initialized by "public void initialize()"
      try {
         // get the outputstream
         outputStream = serialPort.getOutputStream();
      } catch (IOException e) {}
      try {
         // activate the OUTPUT_BUFFER_EMPTY notifier
         serialPort.notifyOnOutputEmpty(true);
      } catch (Exception e) {
         System.out.println("Error setting event notification");
         System.out.println(e.toString());
         System.exit(-1);
   public void writetoport(int counter) {
      try {
         // write string to serial port
         outputStream.write(String.valueOf(array[counter]).getBytes());
      } catch (IOException e) {}
   public void initialize() {
      // initalize serial port
      try {
         serialPort = (SerialPort) portId.open("SimpleReadApp", 2000);
      } catch (PortInUseException e) {System.out.println("Port In Use.");} //******Here is the Exception******
      try {
         inputStream = serialPort.getInputStream();
      } catch (IOException e) {}
      try {
         serialPort.addEventListener(this);
      } catch (TooManyListenersException e) {}
      // activate the DATA_AVAILABLE notifier
      serialPort.notifyOnDataAvailable(true);
      try {
         // set port parameters
         serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,
                     SerialPort.STOPBITS_1,
                     SerialPort.PARITY_NONE);
      } catch (UnsupportedCommOperationException e) {}
      // start the read thread
      readThread = new Thread(this);
      readThread.start();
   public void run() {
      // first thing in the thread, we initialize the write operation
     initwritetoport();
     for(int i=0; i<=num_of_inputs; i++) {
        // write string to port, the serialEvent will read it
        writetoport(i);
     serialPort.close();
   public void serialEvent(SerialPortEvent event) {
      switch (event.getEventType()) {
      case SerialPortEvent.BI:
      case SerialPortEvent.OE:
      case SerialPortEvent.FE:
      case SerialPortEvent.PE:
      case SerialPortEvent.CD:
      case SerialPortEvent.CTS:
      case SerialPortEvent.DSR:
      case SerialPortEvent.RI:
      case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
         break;
      case SerialPortEvent.DATA_AVAILABLE:
         // we get here if data has been received
         byte[] readBuffer = new byte[20];
         try {
            // read data
            while (inputStream.available() > 0) {
               int numBytes = inputStream.read(readBuffer);
            // print data
            String result = new String(readBuffer);
            System.out.println("Read: "+result);
         } catch (IOException e) {}
         break;
}...and the outcome is :
Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException:
Error opening "/dev/ttyS0"
tcgetattr(): Input/output error
at com.sun.comm.LinuxDriver.getCommPort(LinuxDriver.java:66)
at javax.comm.CommPortIdentifier.open(CommPortIdentifier.java:369)
at ParallelCommunication.initialize(ParallelCommunication.java:128)
I have searched a lot and I couldn't find a solution.
Thank you.

I'm having the same problem this helped somewhat debug the problem
http://bloggerdigest.blogspot.com/2006/11/linux-serial-com-port-diagnostic-test.html
I'm running Suse 10.3 and apparently it does not recognize my serial ports. So before
you can test your Java code you have to figure out how to make linux see the ports.
If I find a solution I'll let you know but if you find one first let me know. Thanks.

How to transfer file from PC to PC via serial port using labview

I need to transfer files(.txt, .doc, .xls) from PC to PC via serial port using LabVIEW. Is it possible to transfer files, if so how to transfer?
Solved!
Go to Solution.

Yes, it is possible to transfer files with the serial port using LabVIEW. Files are just collections of bytes and the serial port is pretty good at shipping bytes from one PC to another. You need to connect the serial ports together with a null modem cable.
First, take a look at the example for serial communication. In LabVIEW, go to the Help menu and select "Find Examples...". From there you can search for "serial" or navigate to Hardware Input and Output >> Serial. Select the "Basic Serial Write and Read.vi". Experiment with that example to gain confidence on the serial communication methods.
Next, it's time to learn about how to read and write files. For that, the examples could be somewhat confusing since they all deal with files that are presumed to have data of a specific type in them. I would recommend just getting familiar with the functions on the File I/O palette. Specifically, get to know the following functions.
Open/Create/Replace File - On your destination side, you'll need to create the copy of the file that you are trying to transfer
Close File - When you are finished reading from or writing to a file, you should close it. It cleans up the memory being used and finalizes any write operations that are still floating in the write buffer.
Read From Binary File - The best way to read from a file when you do not really care what type of file it is. In your case, you just want to get those bytes read and sent out so they can be written down at the destination.
Write to Binary File - At the destination side, this is what will store those bytes to the file you created with number 1.
Get File Size (under the Advanced File Functions sub-palette) - You need to know how big the file is so you know when you are finished.
OK, so once you are able to create files, write bytes to them, and read bytes from existing files you can move on to transferring.
The basic method I would suggest is to have the user specify a source file on the source PC and a destination folder on the destination PC. Then, find out the size of the source file using number 5. Divide that size number by the number of bytes you feel like transferring at once. The serial buffers are usually around 32k (if I remember correctly) so do not exceed that. Now begin sending data by reading some number of bytes and wiring that string output to the VISA Write function. On the destination side, you'll want to be monitoring the serial port for bytes and reading them when they arrive. Wire that string to the Write to Binary File function to add them to your destination file.
That is the basic outline of how to do it. You have to be careful not to overload the write and read buffers on the serial ports. Initially you can use delays on the sending side to make sure the reading side has enough time to digest. To get things moving faster, you can bring in some flow control.
If all that sounds a bit intimidating, there are Alliance Member companies out there (such as PrimeTest Automation) who can write such code for you and even provide a turnkey solution for you.
Happy wiring,
Dan Press
Certified LabVIEW Architect
PrimeTest Automation

Connection Siemens TC65 to PC via serial port

I don't connect Siemens TC65 via serial port . How can I do this? How can I upload java code in tc65..
Is there anyone to solve this problem?

tajava
Welcome to the forum. Please refrain from posting in old threads that are long dead. When you have a question, please start a topic of your own. Feel free to provide a link to an old thread if relevant.
I also suggest you go through these links before posting again:
[How to ask questions the smart way|http://catb.org/~esr/faqs/smart-questions.html]
[How To Get Good Answers To Your Questions|http://www.tek-tips.com/viewthread.cfm?qid=473997]
I'm locking this thread now.
db

Files via serial port

I need to send a jpg file via serial port. Have anyone an idea how to get it. I am using LabView 6.0.

Hi Francesc,
In order to solve this you will need:
- a null modem cable (the difference is that pin 2in goes to pin 3out and pin 3in goes to pin 2out)
- a normal serial communication VI (you can use the one in lv\examples)
- to pass the data you have to transform your array of bytes (your file) in string at sender and reverse this operation at receiver. THE ONLY PROBLEM is with ASCII character 11 (even if the receiver has all your bytes in buffer it seems that will return to you just those before ASCII 11). Thus, you will have to avoid the transmission of this character. An idea will be to split each byte from file in other two for transmission - for example its hex code (so, 11 will be transmitted as 0B ). Of course, this method doubles the number of transmit
ted bytes. If somebody found a better solution, please let me know.
good luck

I want to transfer data through the serial port in the same coding that hyperterminal uses. How can i do it?

The serial port seems to be working, and labview seems to be sending the data, but the problem is in which format does it send the data, because in hyperterminal i just input the string "JDX" and it sends it to my device, with labview it sends something but my device does not recognize it.

nobuto wrote:
> I want to transfer data through the serial port in the same coding
> that hyperterminal uses. How can i do it?
>
> The serial port seems to be working, and labview seems to be sending
> the data, but the problem is in which format does it send the data,
> because in hyperterminal i just input the string "JDX" and it sends it
> to my device, with labview it sends something but my device does not
> recognize it.
Hyperterminal adds the carriage return/line feed to the string which is
generated by the return key to send out the current line. LabVIEW simply
sends out what you tell it, so try to set the string to "Show \ Display"
format and add a \r or \n or \r\n to the command you want to send out.
Assumes of course that you set the right baudr
ate/bits/parity etc in
LabVIEW with the VISA property node, when opening the serial port.
Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Why does a standalone program created in Labview 8.5 try connecting to the internet when the program only reads data through the serial port? Firewalls object to progams that contact the internet without permission.

why does a standalone program created in Labview 8.5 try connecting to the internet when the program only reads data through the serial port? Firewalls object to progams that contact the internet without permission.
The created program is not performing a command I have written when it tries to connect to the internet, it must be Labview that is doing it. How do I stop this from happening?
Any help would be very appreciated.

It looks that way..
"When LabVIEW starts it contacts the service
locator to removes all services for itself. This request is triggering
the firewall.This is done in case there were services that were not
unregistered the last time LabVIEW executed- for example from VIs that
didn't clean up after themselves"
This is not yet fixed in LV2009.
Message Edited by Ray.R on 11-04-2009 12:25 PM

I've got the labview vi written to read my IMU data from a serial port in COM1 and it displays onto the table on the front panel. I'm having trouble getting this data onto an excel spreadsheet. Any ideas?

I've got the labview vi written to read my IMU data from a serial port in COM1 and it displays onto the table on the front panel. I'm having trouble getting this data onto an excel spreadsheet. Any ideas? Right now my data will collect one reading instead of continuously reading my IMU which displays data in a continuous stream.
Thanks
Attachments:
Read_IMU_Drew.vi ‏21 KB

Hi
Your vi is in 2009 version, which i am unable to open in 8.6
However, if you want your data to be saved in excel sheet, here is the VI
Somil Gautam
Think Weird
Attachments:
save to excel.vi ‏12 KB

Export CDR via serial port

The hardware platform is Cisco UCSC-C220-M3SBE, the Call Manager version is 8.6.2.22900-9.
We manage to export the CDR to a sftp server. However, the bill system vendor requests us to export the CDR via serial port.
Is it possible to do it onto our platform in this case?

On CUCM no, but with CME it can be done (by collecting syslog output). Otherwise you may exploit the CDRs on the voice gateway.
It's not everytime that CUCM offers the required feature!

Project select data from the serial port

Hi everyone,
The project is about use labview to receive data from a serial
port wirelessly. The serial port will receive two values (X1 and X2) every 10
minutes. I want to use those two values as two inputs for my formula. How to
make selection? Many thanks.
Baicy
Solved!
Go to Solution.
Attachments:
port read.png ‏23 KB

Scan From String.
Using the first option, and putting some numbers in for the zeroes so it shows some kind of meaningful result.
Attachments:
Example_VI.png ‏12 KB

RMI via serial port.

I would like to use RMI via serial port.
How can I do that?

Thanks for the reply
I can get it sending bytes of info from one machine to
another but not to sure how I still send an object
Wy do you think I should'nt be sending an object using
rmiOK, if you have a setup working that involves writing bytes to an OutputStream at one end, and reading bytes from an InputStream at the other, then all you need to do is create an ObjectOutputStream at one end, and write the object to it.
    ObjectOutputStream oos = new ObjectOutputStream(myOutputStream);
    oos.writeObject(myObjectToSend);
    oos.close();and at the other end an ObjectInputStream:
    ObjectInputStream ois = new ObjectInputStream(myInputStream);
    MyObjectType myObjectToReceive = (MyObjectType) ois.readObject();
    ois.close();That should pretty much do it.
The reason you should not be using RMI for this is that it relies on the existence of a netork layer that connects the two machines. PPP would have provided that, but there just doesn't seem a justification for that level of complexity here.
Sylvia.

Error while trying to read more number of data via Serial port

Hi All,
I'm newbie to Serial Port programming. I'm trying to read data from dos based system which is sending 150 characters (including) at a time. That time my programm was fine but now they increased the length of the characters 300, now my programming couldn't read data. I'm using byte array to capture the data byte buff = new byte[3048*3048]Ypur reply would greatly appreciate.

You have a byte array with more than 9 million bytes. What does that have to do with reading 300 characters?

Motion Control via Serial Port

I have previously developed an automated video microscope application in Labview. It worked great. My setup was: NI PXI system with 1409 image board, 7344 motion controller, 7764 breakout box, stepper motors, motor drivers, and tables. Now, a customer is requiring that we use a specific brand of drivers that encompass a motion controller and are daisy-chained together. Communication will take place from a serial port, thereby bypassing the 7344. My question is: will I have to can my entire previous Labview motion/data acquisition program b/c I won't be using the 7344 controller? Or, will it be easy to specify in the program to commmunicate via the serial port rather than the card? Would this setup take place in MAX, or in the LabView applicatio
n itself? Any nuances that I should know about? Any info would be appreciated. THANX-ROB

Rob,
in this case you won't be able to use any of your motion related code. The motion VIs in LabVIEW call the NI-Motion driver dll and thus they are not hardware independant. By the way, this is not a specific disadvantage of the NI-Motion driver. In fact there is not such a thing available like a standardized interface and hardware independant motion control language.
In general you will have to use low level serial communication (VISA). That means you have to read the drive/controller manual, identify the serial command strings you need and send them to the device.
For configuration the drive vendor should provide a utility to set the necessary parameters.
On the other hand you could be lucky in the case that the vendor of the drive/controller provides h
igh level LabVIEW vis. You should check with this vendor if a LabVIEW driver is available. Still you will have to rewrite your motion related part of the code.
I'm sorry that there are no better news.
Best regards,
Jochen
NI-Germany

Data acquisition via serial port (COM)

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