How to plot data from a GPIB function generator

I am doing a litle application with Visual C++ and the ComponentWorks++ to
control a GPIB device. I am tring to Plot a CNiGraph with data coming from
the GPIB function generator. I use the code below to write/read the device
and to Plot the graph. It give me some results but for exemple, if I
request a sin wave it give me something that doesn't look like a sin and if
I request a square wave it give me about the same wave... So I want to know
if the problem is in my code or maybe it's because my device is just a
emulator not a real func generator. But I guest I am doing some kind of
convertion error.
CNiInt16Vector vBuffer(100); // Should I try CNiReal64Vector or something
else ?
m_Visa->Write(m_strC
ommande); // Write to the device, this works well
m_Visa->Read(vBuffer); // Is it the right way to do reading ?
m_Graph.PlotY(vBuffer); // This Plot some data, but it doesn't seem right
Could somebody bring the light on this?
Thanks alot!
P.S. Sorry for the bad english...

Ares:
I have two suggestions about common problems in VISA.
(1) How is m_Visa defined? There is occasionally some confusion about which VISA class should be used for this purpose. CNiVisaSession is the class designed for this purpose.
(2) How is the instrument returning data? Usually instruments return some sort of header before the actual data.
You may want to contact National Instruments Technical Support to continue this discussion. You can reach our telephone support at 1-800-IEEE-488 or email support at http://www.ni.com/ask.
Good Luck,
Chris Wood
Applications Engineer
National Instruments

Similar Messages

How to read data from a GPIB when sending a function generator command

I'm using Visual C++ with the ComponentWork ActiveX and I'm tring to plot a
CWGraph using the data coming from a GPIB device. When I write command such
as "*IDN?" to the GPIB device, everythings if fine and I can read what the
GPIB device return me. But when I send a command like "SOUR:FUNC SIN;SENS
DATA?", the writing seems to be okay, but when I try to read the data, I
alway get a "Timeout expired before operation completed" error message. I
have tried with the CWGPIB and with the CWVISA but the result are the same
with both.
My reading code looks like this:
COleVariant vReadBuffer;
vReadBuffer = m_VISA.Read( COleVariant( (short) 2000 ) );
and it work fi
ne for "*IDN?" or for multimeters command.
I want to know how I must read the data for function generator commands.
Thank alot

It sounds like your device is not accepting that command string as valid. The string you listed above is probably missing a colon between SENS and DATA. "SOUR:FUNC SIN;SENSATA" Try sending this string in Measurement & Automation Explorer to the instrument first to make sure it is working.
Best Regards,
Chris Matthews
Measurement Studio Support Manager

Working with Binary data from the Gpib Read Function

I m using the gpib read command to recieve data from a gpib instrument. I already know the form of the binary data being sent back. I have programmed it in matlab before. I am haveing trouble parseing out the binary data I recieve. the basic form of the data is
#I immediately followed by 401 64 bit ieee floating point numbers. When I programmed this in matlab the code I used was of the form:
[a,count,msg]=fread(g2,2,'int8');
[a,count,msg]=fread(g2,401,'float64');
for those that don't know matlab code the command reads data from the instrument pointed to by the g2 handle. the number after the g2 above speicifies the number of values to read. And the last part the string in qoute specifies the way the binary data
is to be interepeted. the output arguments a count and msg are
a-your data
count-number of items succesfully read in
msg-error message
In the above two lines I use the variable a twice to capture the data. The first time a is set equal to '#I' everything inside the qoutes. The second time a is set equal to the actual data, in this case 401 64bit floating point numbers. I m convince that the flatten to string and unflatten from string function are the set meant to accomplish this task. But I haven't been able to find a good example of how to use these functions. Especially with an array.
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Thanks
Scourched

I'm pretty sure what you're describing is a simple typecast in LabVIEW. You will want to strip off the #I first, using string manipulation functions. Then, you can wire the string into a "typecast" VI, and wire a double precision float constant to the top connector of the typecast (this tells the VI that you expect a 64 bit float output) and then you can read your resulting array of double precision floats on the output of the typecast. The typecast VI is found in All Functions >> Advanced >> Data Manipulation.
I've attached an example in LabVIEW 7.0 and also 7.1 format.
Scott B.
Applications Engineer
National Instruments
Attachments:
typecast.vi ‏11 KB
typecast.vi ‏13 KB

How to plot data in a chart?

I'm trying to plot data from a table in
a ChartControl object. The table consists
of two columns, one contains a numeric
value and the other contains a date value.
I'd like to plot the numeric value on the
Y axis and the dates along the X axis.
I've got the same data displayed in a grid
format, and that's all fine.
This seems like a simple enough thing to
do, but I haven't found a basic page of
documentation to guide me in the right
direction. How do I do this?

Use Reshape array to turn your 2-D array into a 1-D array. You will need to wire in a constant of 40 since you will have 40 elements in your new array. Convert the 1-D array to a cluster with Array to Cluster. Right click on that function and set the size of the array to 40. Wire that cluster to the waveform chart. Now each of your 40 values you get after the double For Loops will run will append their new data to the 40 lines on your waveform chart.
Message Edited by Ravens Fan on 12-18-2009 11:30 PM
Attachments:
ThermocoupleReadings[1]_BD.png ‏13 KB

HOW TO UPLOAD DATA FROM EXCEL TO INTERNALTABLE

HI,
HOW TO UPLOAD DATA FROM EXCEL TO INTERNALTABLE? & WITH EXAMPLE.

hi,
chk this, put the data into an excel file.
fields inside it are name and age.
sample excel sheet.
coloumn 1 is name and column 2 is age
name age
A 8
C 13
D 55
DATA : int_excel LIKE alsmex_tabline OCCURS 0 WITH HEADER LINE.
data : record like db_name_age occurs 0 with header line.
DATA : v_start_col TYPE i VALUE '1', "starting col
 v_start_row TYPE i VALUE '1', " starting row
 v_end_col TYPE i VALUE '2', " total columns
 v_end_row TYPE i VALUE '10'. "total no of record
FORM f_upload .
CLEAR : int_excel, int_excel[].
CALL FUNCTION 'ALSM_EXCEL_TO_INTERNAL_TABLE'
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 filename = wf_filename
 i_begin_col = v_start_col
 i_begin_row = v_start_row
 i_end_col = v_end_col
 i_end_row = v_end_row
 TABLES
 intern = int_excel
 EXCEPTIONS
 inconsistent_parameters = 1
 upload_ole = 2
 OTHERS = 3.
IF sy-subrc <> 0.
*Message is 'Unable to upload data from ' wf_filename.
 MESSAGE e169(zm050) WITH wf_filename.
ELSE.
 SORT int_excel BY row col.
 REFRESH : record.
 CLEAR : record.
 LOOP AT int_excel.
 CASE int_excel-col. "go thru each column.
 WHEN 1.
 record-name = int_excel-value.
 WHEN 2.
 record-age = int_excel-value.
 ENDCASE.
 AT END OF row.
 APPEND record.
 CLEAR record.
 ENDAT.
 ENDLOOP.
*inserting into table
modfiy db_name_age from table record.
ENDIF.
ANOTHER EXAMPLE
TYPE-POOLS truxs.
types: begin of t_tab,
col1(5) type c,
col2(5) type c,
col3(5) type c,
end of t_tab.
data : itab type standard table of t_tab,
 wa type t_tab.
data it_type type truxs_t_text_data.
parameter p_file type rlgrap-filename.
data ttab type tabname.
at selection-screen on value-request for p_file.
CALL FUNCTION 'F4_FILENAME'
EXPORTING
PROGRAM_NAME = SYST-CPROG
DYNPRO_NUMBER = SYST-DYNNR
FIELD_NAME = 'P_FILE'
IMPORTING
FILE_NAME = p_file
start-of-selection.
CALL FUNCTION 'TEXT_CONVERT_XLS_TO_SAP'
EXPORTING
I_FIELD_SEPERATOR =
I_LINE_HEADER = 'X'
i_tab_raw_data = it_type
i_filename = p_file
tables
i_tab_converted_data = itab[]
EXCEPTIONS
CONVERSION_FAILED = 1
OTHERS = 2
IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
end-of-selection.
loop at itab into wa.
write : wa-col1,
 wa-col2,
 wa-col3.
endloop.
rgds,
anver
if hlped pls mark points

How to upload data from excel to SAP and options to be used

How to upload data from excel to SAP and options to be used
thank you,
Regards,
Jagrut Bharatkumar shukla

Hi Jagrut,
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chk the sample program mentioned below.
REPORT ZFTP .
DATA: BEGIN OF I_FILE OCCURS 0,
DATA(2000) TYPE C,
END OF I_FILE.
DATA: BEGIN OF I_FILE2 OCCURS 0,
DATA(2000) TYPE C,
END OF I_FILE2.
DATA: W_COUNT TYPE I.
PARAMETERS: P_FILEN TYPE STRING,
P_FILE2 TYPE STRING,
P_NUM(4) TYPE N..
AT SELECTION-SCREEN ON VALUE-REQUEST FOR P_FILEN.
PERFORM F_FILE_GET USING P_FILEN TEXT-G01.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR P_FILE2.
PERFORM F_FILE_GET USING P_FILE2 TEXT-G01.
START-OF-SELECTION.
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EXPORTING
filename = P_FILEN
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HAS_FIELD_SEPARATOR = 'X'
HEADER_LENGTH = 0
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DAT_MODE = ' '
CODEPAGE = ' '
IGNORE_CERR = ABAP_TRUE
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CHECK_BOM = ' '
VIRUS_SCAN_PROFILE =
NO_AUTH_CHECK = ' '
IMPORTING
FILELENGTH =
HEADER =
tables
data_tab = I_FILE
IF SY-SUBRC <> 0.
MESSAGE E024(Z1).
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W_COUNT = W_COUNT + 1.
IF NOT W_COUNT > P_NUM.
MOVE I_FILE TO I_FILE2.
APPEND I_FILE2.
ENDIF.
ENDLOOP.
CALL FUNCTION 'GUI_DOWNLOAD'
EXPORTING
BIN_FILESIZE =
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FILETYPE = 'ASC'
APPEND = ' '
WRITE_FIELD_SEPARATOR = 'X'
HEADER = '00'
TRUNC_TRAILING_BLANKS = ' '
WRITE_LF = 'X'
COL_SELECT = ' '
COL_SELECT_MASK = ' '
DAT_MODE = ' '
CONFIRM_OVERWRITE = ' '
NO_AUTH_CHECK = ' '
CODEPAGE = ' '
IGNORE_CERR = ABAP_TRUE
REPLACEMENT = '#'
WRITE_BOM = ' '
TRUNC_TRAILING_BLANKS_EOL = 'X'
WK1_N_FORMAT = ' '
WK1_N_SIZE = ' '
WK1_T_FORMAT = ' '
WK1_T_SIZE = ' '
IMPORTING
FILELENGTH =
tables
data_tab = I_FILE2
FIELDNAMES =
*& Form F_FILE_GET
text
-->P_P_FILEN text
-->P_TEXT_G01 text
FORM F_FILE_GET USING L_FILENA L_TEXT.
CALL FUNCTION 'WS_FILENAME_GET'
EXPORTING
DEF_FILENAME = ' '
DEF_PATH = ' '
MASK = ',.,*.TXT.'
MODE = 'O'
TITLE = L_TEXT
IMPORTING
FILENAME = L_FILENA
rc =
EXCEPTIONS
INV_WINSYS = 1
NO_BATCH = 2
SELECTION_CANCEL = 3
SELECTION_ERROR = 4
OTHERS = 5
IF SY-SUBRC <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
Reward if helpful.
Regards,
Harini.S

How to send data from internal table to the shared folder in ABAP

Hi experts,
My requirement is to transfer data from a file to shared folder. i just did reading data from a file to a internal table. Now i want to send this internal table data into a shared folder which is "
xxx\y\z....".
I do not have any idea on how to send data from internal table to the shared folder path.
can anybody please help me out how to do this?
Thanks & Regards
Sireesha.

Where that folder is located, its on presentation server i.e. desktop or application server.
If its on presentation server, use FM GUI_UPLOAD.
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[File Handling in ABAP|http://help.sap.com/saphelp_nw04/helpdata/en/fc/eb3ca6358411d1829f0000e829fbfe/frameset.htm]
I hope it helps.
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Please mark all the useful answers

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Hi,
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"Modify your internal table wih data
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"Get the required data from t_cell_data.
MOVE-CORRESPONDING wa_t_axis_data TO it_ur_tab.
"Modify your internal table wih data
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ENDLOOP.
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In the Overview of the R/3 Basis System you have seen that each user can open up to six R/3 windows in a single SAPgui session. Each of these windows corresponds to a session on the application server with its own area of shared memory.
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Message was edited by:
sunil kumar

How to plot data from a GPIB function generator

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