Conversion of serial output (IEEE 754) to single

Hi,
I'm trying to read out the actual values of a MKS PR4000B pressure sensor. I managed to get a connection and read/write data to the device (using serial read/write), but I'm having trouble to convert the read output to a single.
The manual tells me the floating number is conform to IEEE 754, the response I get are 8 bytes: @head, actual value.byte3, actual value.byte2, 0x00, @head, actual value.byte1, actual value.byte0, 0x00
I would like to do a cast type to convert it (like in: http://forums.ni.com/ni/board/message?board.id=170&thread.id=195115&view=by_date_ascending&page=1), but never seem to get the right results.
HO\@ps@ should translate to something like 01.903
any ideas?

Here is a VI that converts your string into a Single .
Message Edited by VADave on 03-05-2009 11:50 AM
Visualize the Solution
CLA
LabVIEW, LabVIEW FPGA
Attachments:
Convert.JPG ‏35 KB
Convert Serial.vi ‏11 KB

Similar Messages

Conversion of a float to IEEE 754 hexa (and vice versa)

Hello everyone,
I need to convert a float into an hexadecimal value to transmit it on a communication bus (I also have to decode the hexa into a float). I need this hexadecimal to respect the IEEE 754 technical standart. I'm trying to do it with the basic functions of Labview but I'm facing some problems. You'll find attached my VI.
If someone has already done such a function or know an easier way to do it, I'll be very grateful.
Attachments:
IEEE 754 conv.png ‏38 KB

If your communication bus in only using singles, then avoid doubles in your code.
How are you converting to a Single from the Doubles? In my quick experiment, I got the right answer.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines
Attachments:
double to single hex.png ‏8 KB

Fichier au format ieee 754

Bonjour,
Est-ce-qu'il est possible de traiter directement un fichier au format IEEE-754 sous Diadem??
Sachant que ce fichier est généré par labview sous une extension qu'on a défini *.rap (comme acquisition rapide).
Je joins un exemple de mon fichier.
Merci d'avance.

Hi M. Brad Turpin,
Yes, I have a LabVIEW program which is streaming binary (IEEE-754) data to disk to a file with the extension *.rap, and I would like to know if it is possible to read this file into DIAdem directly?
I attach in the folder *.zip the VI and several *.rap file. The VI ("PXI31.vi") write these *.rap files in the NI PXI 8186. I have too a VI ("concatenar_archivos.vi") that transfer and concatenate these *.rap files in a PC. In the folder "NI.zip", you have several *.rap file and one *.txt file that the conversion in float of file "5_11-43-05_11-10-2007_NI.Rap". Like this, you can to compare.
In the *.rap file acquisition, from the "5_11-..rap" you have 48 channels and 120 sample. And in other *.rap file acquisition, I have 32 channels and 500000 sample but I can't send this file because it's big file.
Thanks you for help.
Attachments:
NI.zip ‏1038 KB

Display spool output i.e a single row in a single line

hello All,
I have report that outputs many columns is single row , when run in the background.
The problem that I am facing that the the single row of columns is wrapped into second line when certain limit of chararcters is reached. That is the single row of data is placed into two lines.
While running the job in the background I choose the LOCL or LP01 printer with format X_65_255.
Also note that I have other SAP systems but in that systems when I use the same procedure(printer and format also the same) for the same report the outputf for single row is not warpped into 2 lines but appears in the same line.
Please provide your input. Points will be rewrded for helpful answers
regards
Sachin

Note that this solution is for downloading wide formats only - not printing...
Here is what I did:
To create format Y_1024_1023 (New name!)
1) Transaction SPAD
2) Click "Full Administration" button
3) Click on "Device Types" tab
4) Click "Display" button next to "Format Types" field
5) Place cursor on X_65_255
6) Click in menu Format --> Create using template (F5)
7) Change Number of rows to 1023 (if set to 65, you will have more pages and hence more headers)
9) Change Number of Columns to 1023 (as wide as can be displayed in SP01)
8)Give new name to format e.g. Y_1023_1023
To create spool device YSPOOL:
1) Transaction SPAD
2) Click on "Device/Servers" tab (first tab!)
3) Click 'Display" button next to Output Devices field
4) Click "Create" button (Shift-F1)
5) Give output device long name (e.g.YSPOOL) and short name (e.g.YSPO)
6) Device attributes tab --> Device type = ASCIIPRI (Some generic ASCII printer) - I actually used a ZU_ASCII created in our system but ASCIIPRI should also work.
7) Access method tab --> Host printer = some value (e.g. outfile2)
8) Save
Now assign Y_1024_1023 to Device type:
1) Transaction SPAD
2) Click on Device types tab
3) Enter "ASCIIPRI" in "Device types" field and click display button
4) Click on "Formats" button (F6)
5) Click on "Create' button (Shift-F1)
6) In popup, type Y_1023_1023 (or use drop-down to choose from)
7) Save
Per OSS Note 186603 --> Call SPAD and choose Settings -> Spool System -> Other. Select 'SP01: Number of Lines for List Display from Format'. You may have to clear cache via SPAD->Goto->Cache control -->Click "Reset Cache Settings".
Now, when you schedule your background job, choose YSPOOL as your output device and choose the format as Y_1024_1023. The spool generated from this job will be 1023 columns wide and 1024 lines long (less headers!). Note that opening such a large spool (long & wide) will consume lots of app server memory so exit out as soon as download to presentation server is complete.

Conversion unit to output FCP firewire to NTSC?

I'm looking for a no frills external conversion unit to output FCP through firewire to an NTSC monitor, ideally to an HD NTSC monitor.
Any suggestions?
Ben

Hi David,
Three questions (I scanned your suggested URL twice but still wasn't sure).
1. With the Matrox can I run a clip from the FCP timeline, or a Quicktime movie, and see it fullscreen on the external monitor ... or do I get the FCP Apple monitor display with all the FCP windows open (as in how the boys demo the software in the trade shows)?
2. It says 'Broadcast Quality' but will it output to an HD consumer TV?
3. I've got a Sony HDV camera. Some people say I can use that as the interface, but I haven't been able to make it work. And some people say it won't work. If it's SUPPOSED to work, the manual says nothing, Sony's website says nothing ... and I can't figure what buttons to click to get it to work.
I'd be satisfied with an NTSC signal out from the HD timeline ... just to have the TV monitor image to do the colour correcting.
Thank you most kindly,
Ben

How to create 2 ALV output lists in a single output?

Hi guys...
My clients requirement is to create 2 ALV output lists in a single output list.how can i do this?i mean which function module i can use for this requirement?please help me out...
Regards..

*& Report ZLCL_ALV_INT_INVOICE *
REPORT ZLCL_ALV_INT_INVOICE .
DATA: O_CONT1 TYPE REF TO CL_GUI_CUSTOM_CONTAINER,
 O_CONT2 TYPE REF TO CL_GUI_CUSTOM_CONTAINER,
 O_GRID1 TYPE REF TO CL_GUI_ALV_GRID,
 O_GRID2 TYPE REF TO CL_GUI_ALV_GRID.
DATA: IT_VBRK LIKE VBRK OCCURS 1 WITH HEADER LINE.
DATA: IT_VBRP LIKE VBRP OCCURS 1 WITH HEADER LINE.
DATA: WA_VBRK LIKE VBRK.
*--Layout
DATA: WA_LAYO TYPE LVC_S_LAYO.
 CLASS LCL_BILLING DEFINITION
CLASS LCL_BILLING DEFINITION.
PUBLIC SECTION.
 CLASS-METHODS: HANDLE_HOTSPOT_CLICK
 FOR EVENT HOTSPOT_CLICK
 OF CL_GUI_ALV_GRID
 IMPORTING E_ROW_ID.
ENDCLASS. "LCL_BILLING DEFINITION
 CLASS LCL_BILLING IMPLEMENTATION
CLASS LCL_BILLING IMPLEMENTATION.
METHOD HANDLE_HOTSPOT_CLICK.
 IF NOT E_ROW_ID IS INITIAL.
*--Reading selected billing docno
 READ TABLE IT_VBRK INTO WA_VBRK INDEX E_ROW_ID-INDEX.
*--GETTING BILLING DOC ITEMS
 REFRESH IT_VBRP.
 SELECT *
 FROM VBRP
 INTO TABLE IT_VBRP
 WHERE VBELN = WA_VBRK-VBELN.
 CALL SCREEN 200.
 ENDIF.
ENDMETHOD. "HANDLE_HOTSPOT_CLICK
ENDCLASS. "LCL_BILLING IMPLEMENTATION
SELECT-OPTIONS: S_VBELN FOR IT_VBRK-VBELN.
START-OF-SELECTION.
PERFORM GET_DATA.
SET SCREEN 100.
*& Form GET_DATA
 text
FORM GET_DATA .
*--billing header data
SELECT *
 FROM VBRK
 INTO TABLE IT_VBRK
 WHERE VBELN IN S_VBELN.
IF SY-SUBRC <> 0.
 MESSAGE I000(Z00) WITH 'No Data Found'.
ENDIF.
EXIT.
ENDFORM. " GET_DATA
*& Module STATUS_0100 OUTPUT
 text
MODULE STATUS_0100 OUTPUT.
SET PF-STATUS 'MENU'.
ENDMODULE. " STATUS_0100 OUTPUT
*& Module USER_COMMAND_0100 INPUT
 text
MODULE USER_COMMAND_0100 INPUT.
CASE SY-UCOMM.
 WHEN 'BACK'.
 PERFORM EXIT_PROGRAM.
ENDCASE.
ENDMODULE. " USER_COMMAND_0100 INPUT
*& Module PBO_100 OUTPUT
 text
MODULE PBO_100 OUTPUT.
IF O_CONT1 IS INITIAL.
 CREATE OBJECT O_CONT1
 EXPORTING
 CONTAINER_NAME = 'VBRK_CONT'
 EXCEPTIONS
 CNTL_ERROR = 1
 CNTL_SYSTEM_ERROR = 2
 CREATE_ERROR = 3
 LIFETIME_ERROR = 4
 LIFETIME_DYNPRO_DYNPRO_LINK = 5
 OTHERS = 6
 IF SY-SUBRC <> 0.
 MESSAGE I000(Z00) WITH 'Error in container'.
 EXIT.
 ENDIF.
 CREATE OBJECT O_GRID1
 EXPORTING
 I_PARENT = O_CONT1
 EXCEPTIONS
 ERROR_CNTL_CREATE = 1
 ERROR_CNTL_INIT = 2
 ERROR_CNTL_LINK = 3
 ERROR_DP_CREATE = 4
 OTHERS = 5
 IF SY-SUBRC <> 0.
 MESSAGE I000(Z00) WITH 'Error in Grid'.
 EXIT.
 ENDIF.
ENDIF.
*--Layout for 1st grid
WA_LAYO-KEYHOT = 'X'.
WA_LAYO-GRID_TITLE = 'Billing Document Header Data'.
CALL METHOD O_GRID1->SET_TABLE_FOR_FIRST_DISPLAY
 EXPORTING
 I_STRUCTURE_NAME = 'VBRK'
 IS_LAYOUT = WA_LAYO
 CHANGING
 IT_OUTTAB = IT_VBRK[]
 EXCEPTIONS
 INVALID_PARAMETER_COMBINATION = 1
 PROGRAM_ERROR = 2
 TOO_MANY_LINES = 3
 OTHERS = 4.
IF SY-SUBRC <> 0.
 MESSAGE I000(Z00) WITH 'Error in showing grid'.
 EXIT.
ENDIF.
*-Setting the focus on the grid
CALL METHOD CL_GUI_CONTROL=>SET_FOCUS
 EXPORTING
 CONTROL = O_GRID1 "Grid control object
 EXCEPTIONS
 CNTL_ERROR = 1
 CNTL_SYSTEM_ERROR = 2
 OTHERS = 3.
IF SY-SUBRC <> 0.
 MESSAGE I000(Z00) WITH 'Error in setting focus'.
ENDIF.
*--Event handler registration
SET HANDLER LCL_BILLING=>HANDLE_HOTSPOT_CLICK FOR O_GRID1.
ENDMODULE. " PBO_100 OUTPUT
*& Module STATUS_0200 OUTPUT
 text
MODULE STATUS_0200 OUTPUT.
SET PF-STATUS 'MENU'.
ENDMODULE. " STATUS_0200 OUTPUT
*& Module USER_COMMAND_0200 INPUT
 text
MODULE USER_COMMAND_0200 INPUT.
CASE SY-UCOMM.
 WHEN 'BACK'.
 LEAVE TO SCREEN 100.
ENDCASE.
ENDMODULE. " USER_COMMAND_0200 INPUT
*& Module PBO_200 OUTPUT
 text
MODULE PBO_200 OUTPUT.
IF O_CONT2 IS INITIAL.
 CREATE OBJECT O_CONT2
 EXPORTING
 CONTAINER_NAME = 'VBRP_CONT'
 EXCEPTIONS
 CNTL_ERROR = 1
 CNTL_SYSTEM_ERROR = 2
 CREATE_ERROR = 3
 LIFETIME_ERROR = 4
 LIFETIME_DYNPRO_DYNPRO_LINK = 5
 OTHERS = 6
 IF SY-SUBRC <> 0.
 MESSAGE I000(Z00) WITH 'Error in container'.
 EXIT.
 ENDIF.
 CREATE OBJECT O_GRID2
 EXPORTING
 I_PARENT = O_CONT2
 EXCEPTIONS
 ERROR_CNTL_CREATE = 1
 ERROR_CNTL_INIT = 2
 ERROR_CNTL_LINK = 3
 ERROR_DP_CREATE = 4
 OTHERS = 5.
 IF SY-SUBRC <> 0.
 MESSAGE I000(Z00) WITH 'Error in grid linking'.
 EXIT.
 ENDIF.
 CALL METHOD O_GRID2->SET_TABLE_FOR_FIRST_DISPLAY
 EXPORTING
 I_STRUCTURE_NAME = 'VBRP'
 CHANGING
 IT_OUTTAB = IT_VBRP[]
 EXCEPTIONS
 INVALID_PARAMETER_COMBINATION = 1
 PROGRAM_ERROR = 2
 TOO_MANY_LINES = 3
 OTHERS = 4.
 IF SY-SUBRC <> 0.
 MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
 WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
 ENDIF.
ELSE.
*--refreshing the alv grid with the latest content of the internal table
*--which is linked
 CALL METHOD O_GRID2->REFRESH_TABLE_DISPLAY
 EXCEPTIONS
 FINISHED = 1
 OTHERS = 2.
 IF SY-SUBRC <> 0.
 MESSAGE I000(Z00) WITH 'Error in Refreshing gird'.
 ENDIF.
ENDIF.
ENDMODULE. " PBO_200 OUTPUT
*& Form EXIT_PROGRAM
 text
FORM EXIT_PROGRAM .
*--Deallocating the memory
IF NOT O_CONT2 IS INITIAL.
 CALL METHOD O_CONT2->FREE
 EXCEPTIONS
 CNTL_ERROR = 1
 CNTL_SYSTEM_ERROR = 2
 OTHERS = 3.
 IF SY-SUBRC <> 0.
 MESSAGE I000(Z00) WITH 'Error in deallocating memory'.
 EXIT.
 ENDIF.
 CLEAR: IT_VBRP,
 IT_VBRP[].
 FREE: IT_VBRP,
 IT_VBRP[].
ENDIF.
IF NOT O_CONT1 IS INITIAL.
 CALL METHOD O_CONT1->FREE
 EXCEPTIONS
 CNTL_ERROR = 1
 CNTL_SYSTEM_ERROR = 2
 OTHERS = 3.
 IF SY-SUBRC <> 0.
 MESSAGE I000(Z00) WITH 'Error in deallocating memory'.
 EXIT.
 ENDIF.
 CLEAR: IT_VBRK,
 IT_VBRK[].
 FREE: IT_VBRK,
 IT_VBRK[].
ENDIF.
*--Cearing the buffered content
CALL METHOD CL_GUI_CFW=>FLUSH
 EXCEPTIONS
 CNTL_SYSTEM_ERROR = 1
 CNTL_ERROR = 2
 OTHERS = 3.
IF SY-SUBRC <> 0.
 MESSAGE I000(Z00) WITH 'Error in clearing Buffer'.
 EXIT.
ENDIF.
LEAVE PROGRAM.
ENDFORM. " EXIT_PROGRAM
SCREEN 100
PROCESS BEFORE OUTPUT.
MODULE STATUS_0100.
MODULE PBO_100.
PROCESS AFTER INPUT.
MODULE USER_COMMAND_0100.
SCREEN200
PROCESS BEFORE OUTPUT.
MODULE STATUS_0200.
MODULE PBO_200.
PROCESS AFTER INPUT.
MODULE USER_COMMAND_0200.

IEEE-754-Standard floating point confusion

Hi there,
I am really confused. The datatype double should be in C++ and Java the same standard acc. to IEEE-754.
But when I try to investigate the several bytearrays created from a double value e.g. 1.1d, it is different in C and Java.
below are the results:
Value 1.1 in C++
intCsigned
     bit0     bit1     bit2     bit3     bit4     bit5     bit6     bit7
byte0     1     1     0     0     1     1     0     1     -51
byte1     1     1     0     0     1     1     1     0     -52
byte2     1     0     0     0     1     1     0     0     -116
byte3     0     0     1     1     1     1     1     1     63
byte4     1     1     0     0     1     1     0     0     -52
byte5     1     1     0     0     1     1     0     0     -52
byte6     1     1     0     0     1     1     0     0     -52
byte7     1     1     0     0     1     1     0     0     -52
Value 1.1 in Java
intJava(signed)
byte0     0     0     1     1     1     1     1     1     63
byte1     1     1     1     1     0     0     0     1     -15
byte2     1     0     0     1     1     0     0     1     -103
byte3     1     0     0     1     1     0     0     1     -103
byte4     1     0     0     1     1     0     0     1     -103
byte5     1     0     0     1     1     0     0     1     -103
byte6     1     0     0     1     1     0     0     1     -103
byte7     1     0     0     1     1     0     1     0     -102
Can please somebody bring light into that?????
Does somebody know the exact specification of a double datatype in c++ and java?
with the best regards,
stonee

OK,
It seems my C-program created a bad array. I finally
found out, that the Java and C Array of each double is
exactly turned.
C[0] == J[7]
C[1] == J[6]
C[2] == J[5]
its probably big endian vs little endian issues plus on top of that nibble swapping.
I happen to be working on this very problem at this instant. I'll see what I can dig up.

How to read register storaged in IEEE 754

Hi!
I need to build an application to read registers from my gauge. Application is almost finished but values i get on from holding register are different than values on my gauge (ex. i have voltage 230V on gauge, and values about 20k in application). Gauge stores values in IEEE 754 32-bit format and I have no idea how to read it to get correct value. I saw it's possible with using "Type cast", but i don't know how to configure it, I am totally newbie in LabVIEW. I will be much grateful if someone could show me a VI with reading from IEEE 754 option, or just tell me how to do it in detail (what to click, what to write, etc )
Sorry for my english, I hope I didn't make many mistakes
Greets
Solved!
Go to Solution.

Notice your red dots, they indicate a data type mismatch. Remove the byte array to string, because it truncates your U16 array elements to U8. Typecast and unflatten accepts U16 arrays directly. (corrected, see answer below)
Also change your "holding registers" to a diagram constant (righ-click terminal...change to constant). Only the type matters, the data is irrelevant here. (Shouldn't it be a scalar SGL instead?)
Sorry, I don't have the toolkit so I am missing your subVI.
LabVIEW Champion . Do more with less code and in less time .

I never used LabView but need to generate a RS-233 serial output string that contains an IRIG timestamp based on a contact closure. Is LabView an appropriate tool to do this? How much does it cost to get started with the product?

I never used LabView but need to generate a RS-233 serial output string that contains an IRIG timestamp based on a contact closure. Is LabView an appropriate tool to do this? How much does it cost to get started with the product?

Labview isn't cheap, but it would certainly allow you to build a program (set of vi's - virtual instruments) that would do what you describe. Where would the timecode information come from? Your vi, or program, would: Start up, initialize the serial port, loop until a trigger happened, read the timecode (from where?), output that timecode out the serial port in a loop until you pressed the stop button. There is a free evaluation of Labview software available from NI - the base product itself runs about $995.
- Dave

Issue with Varchar2 field conversion for report output generated in EXCEL

Hello All,
I have an unique problem with one of my new reports for the User. The user wants the report output generated in excel data only(delimited data) format *(reports builder 10g)* .
Everything was fine until i encountered this problem, there was this field which has unique ID's(alphanumeric and numeric), when i tried to run the report and generate output in Excel the numeric ID's say for example *(41593497999679354429)* is converted in excel and displayed like *(2.5881E+19)* and after format cells in excel it displays *(41593497999679300000).*
The issue is only with 20 digits numeric ID's , if i append any special character to the end say '#' or '..' it shows the exact value along with the appended character. But the user insist they need only the value that is in the table. I am finding it hard to figure out, if any one of you have encountered the same issue or if any of you have any suggestions to overcome this excel conversion thing please do advice me.
Thanks in advance :)

Thanks for you response, but i already tried what you suggested, instead of appending single quote in front of ID, i did at the end prior with '#', it preserves the value if i add any character to the id but the appended value shows up too :(.
Well, i just got the solution and it did work, thanks to [Brian Hill|https://forums.oracle.com/forums/thread.jspa?threadID=651632] for the post, i did what exactly he said and it worked. I was so very happy and wanted to share with everyone.

XML output - all tags in Single line?

Hi,
Scenario: HTTP----> XI --- > File(XML)/Proxy(abap).
Output XML file has the data in single line(all XML tags).
Now, issue with abap proxy which reads this XML file for sending attachment in email has length constraint(can not read if line length exceeds 255 chars).
Is there any option in XI, to print each pair of tags in each line(using carriage return or line feed?)
Please help.

Mallik,
I do not think that this can be achieved in XML to XML (unless you can create a specific module and add to the module tab)
But if you create say a CSV or TXT file and use the Content Conversion Parameters option
Here you can specify the fieldSeparator to be 'nl'
Input
<?xml version="1.0" encoding="UTF-8"?>
<record>
<field1>f1</field1>
<field2>f2</field2>
<field3>f3</field3>
</record>
Output
f1
f2
f3
Here you have retained your data and each field is separated by a new line. Unfortunatley with this method you lose your XML tags
Regards,
Mike

Unable to capture data from Serial port using LVRT2010 in single core pentium 4 machine

I am using application written in Labview using windows Labview
Runtime environment 2010. Application creates a tunnel to intercept data from
Serial port.
My problem is, Currently, I am using single core Pentium
processor. When I am trying to intercept the data between COM1 and COM7 (COM 7
is a virtual port) it is not able to capture data.
When I am running Labview RT environment using dual core
processor machine it is running normally. I wonder whether it could be the compatibility issues with
single core Pentium processor.

Hi Magnetica
Are both of the machines running the same runtime engine,
drivers ect?
Have you had RT applications running on this
machine before?
Is the development computer a 64bit machine?
The processor is a supported model (See link below).
http://zone.ni.com/devzone/cda/tut/p/id/8239
Regards
Robert
National Instruments UK & Ireland

SCRIPT TO IMPORT MULTIPLE PLACED IMAGES..AND OUTPUT MULTIPLE IMAGES TO SINGLE PDF.

Anyone got a script to import multiple placed images into CS4? or is this possible in CS5?
and can we output multiple layers into a single PDF in illustrator? Or multiple layers into single JPEGS from illustrator with one command instead of individually saving out each page... would be a huge time saver for me.
Currently I output each completed layer individually and then right click those outputted jpegs in their output folder and choose "combine supported files into acrobat..." to make a single acrobat file..
I`d also like to be able to CTRL click multiple layers and go save as... only those layers get saved out...
And so adding something in the Save for PDF output dialogue box to save layers to multiple pages would be a helpful time saver..

In CS 4 and CS 5 you can drag and drop fro m the finder or the Bridge, and I guess any other similar type viewer, multiple number of image files to a document. You can configure the bridge in such a way as to allow you to see the Bridge and your document at the same time for this very purpose.
If you just drag and drop the files are linked if you drag while holding the shift key then the files will be embedded.
ID and PS CS 5 have a minibridge which works the sam way but is an actually panel and will stay in the front.
I separate the images but they import one on top of another.

How can I output 01001001 on a single line?

Hello,
I am trying to output a binary address on a single channel using a USB6363 DAQ. I have tried using DAQmx, arrays, I looked at the examples, and I probably just am too new to Labview to understand how to adjust the examples for my use. I attached the code I am currently working with, but any suggestions on how to achieve this would be incredibly appreciated.
Thank you!
Attachments:
Address output.vi ‏12 KB

You want to perform a Digital Output, Single Channel, Multiple Samples DAQmx Write. This will allow you to specify the array. I don't have LabVIEW with me at the moment, so I can't see what you've done so far.
Try and check out this example I made which explains how to generate these types of digital signals with a DAQ device.
https://decibel.ni.com/content/docs/DOC-19277
This uses a similar implementation as well:
https://decibel.ni.com/content/docs/DOC-22938
You'll see on the document page an example of the kind of DAQmx task you need to configure.
Alex Thomas, University of Manchester School of EEE LabVIEW Ambassador (CLAD)

How to split one modbus serial output port into two?

Hi all,
Current Situation
My company has a instrument measuring emission in flue gas. The instrument has only one serial port for "modbus" output. The serial port is being used to sending the data collected by the instrument to our DCS.
My Question
I have a separate data acquisition computer which is also able to collect data over serial modbus. Is it possible to split the existing serial modbus output port into two so that both the DCS and my data acqusition computer can collect data from the instrument at the same time? If yes, what software and hardware do I need? One more point, high reliability is required for both data collection processes - to the DCS and to the data acquisition computer.
Thanks and regards,
Roger

What serial protocol are you using? RS-232 or RS-485?
If it is 485, then it is a multidrop bus, so you can just hook up both receivers to the transmitter via a RS-485 hub. If it uses the 232 protocol, then this would not work as only one device can receive data at any given time, so you could set one node up to repeat the signal to the second hub or use LabVIEW Shared Variables.
A Quick Comparison of RS-232, RS-422, and RS-485 Serial Communication Interfaces
Regards,
Peter Flores
Applications Engineer

Conversion of serial output (IEEE 754) to single

Similar Messages

Maybe you are looking for