[SOLVED] How To Read Data Over /dev/ttyUSB0

So...I am using a serial device connected to a Keyspan Serial-to-USB adapter and plugged in to my computer's USB port. The device is constantly sending 115200 baud data over UART, with no parity, 8 data bits, 1 stop bit, no flow control, and no handshaking. I can read the data just fine on my Windows machine (once I install the Keyspan driver). On Arch64, I notice that when I plug it in, /dev/ttyUSB0 shows up so I believe that means the kernel is recognising the device and already has drivers to handle it. I would like to simply see the output of the device through my terminal emulator so I have written the following script....
stty -F /dev/ttyUSB0 115200 cs8 -cstopb -parenb
while true; do
read LINE < /dev/ttyUSB0
echo $LINE
done
When I run this script as root, however, I get no output. I have also tried appending "-icanon min 1 time 1" to the stty arguments list but also to no avail. Can anyone help? Thanks!!
Last edited by tony5429 (2009-10-30 20:59:30)

Thanks, all for the responses!
perbh: I wasn't sure exactly how to implement your suggestion. If the cat line doesn't use the variable, "$LINE", how can "echo $LINE" work? I am probably missing something simple...
Well, I have had a little success. The following script creates blank lines whenever data comes in through the usb device. Basically the device sends FFT data whenever it hears a sound which is greater than a certain threshold, so when I snap my fingers near it I see the FFT data show up in Terminal on Windows. Now, with the script below, if I snap my fingers my Linux machine outputs a bunch of blank lines so basically I just see my linux terminal emulator scrolling whenever I snap my fingers Does anyone have any ideas how to get the actual data on Linux? Thanks again!
stty -F /dev/ttyUSB0 115200 cs8 -cstopb -parenb
while true; do
read -n 8 LINE < /dev/ttyUSB0
echo $LINE
done

Similar Messages

  • How to read data over tcp/ip using labview

    Hi,
    I have a network enabled force transducer (6-axis load cell). I know its IP addr. and the data format it is sending the data out (7 32-bit DWORD, One status and 6 axis force data) . I have been playing around with the simple data client.vi example program. 
    When I executed the program using the devices IP addr. I used to get error 63: TCP/IP connection open. Then I ran the program using localhost in IP addr field, the program executes now indefinetly at one block only. I am attaching the screenshot for ref. 
    Thanks.
    Sasi.
    Attachments:
    TCP-IP.JPG ‏62 KB

    Hello,
    I'm wondering if you can create a rather simple VI that just tries to open and close a TCP connecting to your transducer. All you would need is a TCP Open and a TCP Close wired together with the proper IP address etc. Does this run? I did look to see if there was any NetFT information and I could not find anything. I feel that the problem lies in the communication protocol between your transducer. Another place to see if you can connect to it would be to try hyperterminal. You can access this in Windows XP by clicking Start»All Programs»Accessories»Communications»HypeTermina. Using this, you can try and connect to your instrument with TCP/IP outside of LabVIEW. You might also want to get in contact with the manufacturer to verify that third-party software can indeed communicate with it. There may be a specific set of instructions that need to be sent to the transducer in order to initiate the connection and then read from it. These may be in the form of serial commands that would need to be sent over TCP. What is the make and model of your transducer?
    -Zach
    Certified LabVIEW Developer

  • How applet transfers data over HTTP

    hello,
    I found out that you cannot you sockets in applets (cannot create a socken on the client side) so I want to know how to transfer data over HTTP. What class should I use or some short example would be of much help.

    You can make connections back to the same server the applet came from. If you need to make connections directly to other servers, then you can sign the applet, which will lift the security restrictions (provided users accept your signature as trustworthy).

  • How to read data from a CLUSTER STRUCTURE not cluster table.

    Hi,
    how to read data from a CLUSTER STRUCTURE not cluster table.
    regards,
    Usha.

    Hello,
    A structre doesnt contain data.. so u cannot read from it. U need to find out table of that structure and read data from it.
    Regards,
    Mansi.

  • How to read data from a file that was formatted by excel?

    Hi everyone, I'm familiar with java.io and the ability to read from files, can anyone tell me how to read data from a file that was formatted by excel? Or at least give me some web references so that I can learn about it?

    http://jakarta.apache.org/poi/hssf/index.html
    HSSF stands for Horrible Spreadsheet Format, but it still works!

  • How to read data from a router by using labview

    I am a  beginner labview. How to read data from a router by using labview ? 

    What kind of data are you trying to read?
    Does the router behave like a webserver that you log into?  If so, search the forums for threads discussing HTML.

  • How to read data from a connected modem

    any one can help me? how to read data from a connected modem. The modem received real-time data from other server. The data is in text format. I can see this text when I used hyperterminal for dial up and the data is accumulated such as:
    @aa1235678
    @bb2135647
    @cc5214367
    since it is real-time data, I want to read one line each time instantly when it arrives.

    You need to use the Java Communications API. (http://java.sun.com/products/javacomm/index.html)

  • How to read data from a zipped MS Access file?

    How to read data from a zipped MS Access file?

    RPJ,
    You do not need to use the Close Zip File.vi when you unzip a folder.  This VI is used when you are creating a zip folder.
    As for examples, I found a couple of ActiveX based MS Access examples.  These programs look to be pretty basic.  For more in depth example I would search Microsoft Developers Network
    http://zone.ni.com/devzone/cda/epd/p/id/2188
    http://zone.ni.com/devzone/cda/epd/p/id/1694
    Regards,
    Jon S.
    National Instruments
    LabVIEW R&D

  • How to read data from itab

    can someone help me with this....
    how to read data.....and move it to internal table....
    the requirement is as:
    <b>Get the Participant details in an internal table IT_FINAL_PAR</b>
    •     Loop through IT_PA0002 and move Personnel number (PERNR), Personnel ID Number (PERID), Last name  (NACHN), First name (VORNA), Gender Key (GESCH), Date of Birth (GBDAT) into a final internal table for Participant data IT_FINAL_PAR.
          Read the internal table IT_PA0006 to get the corresponding House Number and Street 
    (STRAS), City (ORT01), Postal code (PSTLZ), State (STATE), 2nd address line (LOCAT) by comparing Personnel Number (PERNR)and move those retrieved field values to the final internal table for Participant data IT_FINAL_PAR.

    Hi,
      you could try the following:
    * work areas
    data: W_PA0002 like line of IT_PA0002[],
          W_PA0006 like line of IT_PA0006[],
          W_FINAL_PAR like line of IT_FINAL_PAR[].
    loop at IT_PA0002 into W_PA0002.
      clear W_FINAL_PAR.
    * move values from IT_PA0002
      W_FINAL_PAR-PERNR = W_PA0002-PERNR.
      W_FINAL_PAR-PERID = W_PA0002-PERID.
    * read address values from IT_PA0006
      read table IT_PA0006 into W_PA0006 with key pernr = W_PA0002-pernr.
      if sy-subrc = 0.
    * move fields from IT_PA0006
        W_FINAL_PAR-STRAS = W_PA0006-STRAS.
      endif.
      append W_FINAL_PAR to IT_FINAL_PAR.
    endloop.

  • How to read data from an internal table into a real table?

    Hello experts,
    I'm relatively new to ABAP and I'm trying to figure out how to read data from an internal table into a table that I created.  I'm trying to use the RRW3_GET_QUERY_VIEW_DATA function module to read data from a multiprovider.  I'm trying to read data from the e_cell_data and e_axis_data tables into a table that I've already created.  Please see code below.
    TABLES MULTITAB.
    DATA:
      query_name TYPE RSZCOMPID,
      s_cubename TYPE RSINFOPROV,
      t_cell_data TYPE RRWS_T_CELL,
      t_axis_data TYPE RRWS_THX_AXIS_DATA,
      t_axis_info TYPE RRWS_THX_AXIS_INFO,
      wa_t_cell_data like line of t_cell_data,
      wa_t_axis_data like line of t_axis_data,
      w_corp_tab like line of t_cell_data.
    s_cubename = 'CORP_MPO1'.
    query_name = 'Z_corp_test'.
        CALL FUNCTION 'RRW3_GET_QUERY_VIEW_DATA'
           EXPORTING
             i_infoprovider           = s_cubename
             i_query                  = query_name
            i_t_parameter            = query_string_tab
           IMPORTING
             e_cell_data              = t_cell_data
             e_axis_data              = t_axis_data
             e_axis_info              = t_axis_info.
    If anyone has any information to help me, I would greatly appreciate it.  Thanks.

    Hi,
    <li>Once you call the function module RRW3_GET_QUERY_VIEW_DATA, lets say data is available in the corresponding tables e_cell_data e_axis_data which you have mentioned.
    <li>Modify your internal table defined for other purpose, with data from e_cell_data e_axis_data like below.
    LOOP AT t_cell_data INTO wa_t_cell_data.
      "Get the required data from t_cell_data.
      MOVE-CORRESPONDING wa_t_cell_data TO it_ur_tab.
      "Modify your internal table wih data
      MODIFY it_ur_tab TRANSPORTING <field1> <field2> <field3>.
    ENDLOOP.
    LOOP AT t_axis_data INTO wa_t_axis_data.
      "Get the required data from t_cell_data.
      MOVE-CORRESPONDING wa_t_axis_data TO it_ur_tab.
      "Modify your internal table wih data
      MODIFY it_ur_tab TRANSPORTING <field1> <field2> <field3>.
    ENDLOOP.
    Thanks
    Venkat.O

  • How to read data directly from clusters

    hi all,
    how to read data directly from clusters
    Thanx in advance,
    amruta.

    Using macro:
    RP-IMP-C2-B2.
    RP-IMP-C2-B1.
    RP-IMP-C2-ZL.
    ....etc.
    For TM cluster, U also can use BAPIs like HR_TIME_RESULTS_GET
    More details see SAP HR course 350(HR Programming)

  • Help me,  How to read data from USB ???

    Help me, How to read data from USB ???

    If its a disk on key or some portable hard drive than once its connected to the usb and recognized by the system you can access it through java like you would access your hard drive.

  • How to read data after select multiple record by checkbox,

    hi experts
    i  m using simple report with check box , and itab whcih contain records
    how to read data after select multiple record by checkbox,
    thanks

    Hi Prashant,
       Try using this logic.This Code displays the list with check boxes. When you check a checkbox and press a button say 'Select All' or 'De Select all' or 'Display'. It will read the data of those records.
    DATA :
      fs_flight TYPE type_s_flight,
      fs_flight1 TYPE type_s_flight1.
    * Internal tables to hold Flight  Details                             *
    DATA :
      t_flight LIKE
      STANDARD TABLE
            OF fs_flight,
      t_flight1 LIKE
       STANDARD TABLE
             OF fs_flight1.
    SET PF-STATUS 'SELECT' .
    PERFORM selection.
    PERFORM displaybasic .
    *                      AT USER COMMAND EVENT                          *
    AT USER-COMMAND.
      PERFORM selectall .
    *&      Form  SELECTION
    *      Select query to reteive data from SPFLI table
    *  There are no interface parameters to be passed to this subroutine.
    FORM selection .
      SELECT  carrid                       " Airline Code
              connid                       " Flight Connection Number                  
        FROM  spfli
        INTO TABLE t_flight.
      DESCRIBE TABLE t_flight LINES w_lines .
    ENDFORM.                               " SELECTION
    *&      Form  DISPLAYBASIC
    *      Display the basic list with SPFLI data
    *  There are no interface parameters to be passed to this subroutine.
    FORM displaybasic .
      LOOP AT t_flight INTO fs_flight.
        WRITE :
             w_check AS CHECKBOX,
             w_mark,
             fs_flight-carrid UNDER text-001,
             fs_flight-connid UNDER text-002.
      ENDLOOP.                             " LOOP AT T_FLIGHT..
      CLEAR fs_flight-carrid .
      CLEAR fs_flight-connid.
    ENDFORM.                               " DISPLAYBASIC
    *&      Form  SELECTALL
    *      To check all the checkboxes with a 'selectall' push button
    *  There are no interface parameters to be passed to this subroutine.
    FORM selectall .
      CASE sy-ucomm.
        WHEN 'SELECT_ALL'.
          w_check = 'X'.
          w_line = 4 .
          DO w_lines TIMES.
            READ LINE w_line .
            MODIFY LINE w_line FIELD VALUE w_check .
            ADD 1 TO w_line .
          ENDDO.                           " DO W_LINES TIMES
          CLEAR w_line.
        WHEN 'DESELECTAL'.
          w_check = space.
          w_line = 4 .
          DO w_lines TIMES.
            READ LINE w_line FIELD VALUE w_mark .
            IF w_mark = space .
              MODIFY LINE w_line FIELD VALUE w_check .
            ENDIF.                         " IF W_MARK = SPACE
            ADD 1 TO w_line .
          ENDDO.                           " DO W_LINES TIMES
        WHEN 'DISPLAY'.
    IF sy-lilli BETWEEN 4 AND w_lines .
        DO w_lines TIMES.
          READ LINE w_num FIELD VALUE w_check INTO w_check
                                     fs_flight-carrid INTO fs_flight-carrid
                                     fs_flight-connid INTO fs_flight-connid.
          IF sy-subrc = 0.
            IF w_check = 'X'
              SELECT  carrid
                      connid
                      fldate               " Flight date
                      seatsmax             " Maximum capacity in economy
                      seatsocc             " Occupied seats in economy class
                FROM  sflight
                INTO  TABLE t_flight1
               WHERE  carrid = fs_flight-carrid
                 AND  connid = fs_flight-connid.
              LOOP AT t_flight1 INTO fs_flight1.
                WRITE :
                  / fs_flight-carrid UNDER text-001,
                    fs_flight-connid UNDER text-002,
                    fs_flight1-fldate UNDER text-007,
                    fs_flight1-seatsmax UNDER text-008,
                    fs_flight1-seatsocc UNDER text-009.
              ENDLOOP.
            ENDIF.                         " IF SY-SUBRC = 0
          ENDIF.                           " IF W_CHECK = 'X'.
          ADD 1 TO w_num.
        ENDDO.                             " DO W_LINES TIMES
        CLEAR w_check.
        w_num = 0.
      ELSE .
        MESSAGE 'INVALID CURSOR POSITION ' TYPE 'E' .
      ENDIF.                               " IF SY-LILLI BETWEEN..
    ENDCASE.                             " CASE SY-UCOMM
    ENDFORM.                               " SELECTALL
    Much Regards,
    Amuktha.

  • JTable, how to read Data from it when enter is pressed

    How to read Data from JTable on Return or lost focus from cell.
    Also please tell me which listener I should should.
    thx for help

    You should read the tutorial about tables, cell editors and models.
    Also you should not [url http://forum.java.sun.com/thread.jsp?thread=472677&forum=57&message=2186815]crosspost
    Mike

  • How to Read Data from a table (horizontal axsis) in an existing report

    Hi to all,
    I've a question. I must read the data in a table of an existing report. I develope with BO XI 3.0
    I don't know how to reach the table in my report from SDK.
    this is my code:
    reports = document.getReports();
    rep = reports.getItem(0);     
    the report has the title and a table horizontal axsis.
    I must read the column name(header column) of the table and all rows for retrieving values.
    Thank u in advance for your attention.

    hi ChinMay,
    thank u for your answer.
    I would like to ask u if Ireport refers crystal reports, while i mean to read data from a webi report.
    I've tried in many manners to read this data and i've read the SDK, but i'm unable to reach the table of my report for reading its rows. i'm able to export in XML format, i'm able to get reportelement , block, but in the java's example of SDK its not present how to obtain the reportbody and subsequently the section or directly a table. the example that i've seen show that if u create a new report u can create the reportbody, the section, the table and others. But don't show how to obtain this from an existing report.
    Probably i don't understand very well all the SDK structure and i think that is possbile to read a table(with horizantal axis) in a report without section only passing by the ReportBody.
    I know that u don't have so time to spent for things that are in the SDK, but if it's possible to have ten rows of sample about this question i'll be very happy.
    If it's not possibile, thank u very much for your interesting and disponbility and i'll try again and again and again to solve this.
    Matteo

Maybe you are looking for