Need RS 422 Function Generator and RS 422 SDLC coomunication
I am working on a project that require a clock that is RS 422 eletric spec at 500Khz and also at the same time, can send command to the test unit using RS 422 SDLC. It can be from 2 different cards. Did anyone know any hardware that can generate RS 422 signal at that speed. Any hardware can send RS 422 SDLC command. We have PXI 8433/4 but that will not work. Can use one of the port to generate the clock signal but can't send SDLC command.
thanks.
One thing you do pick-up using the Off-The-Shelf stuff I mentioned is "Bit-stuffing".
In SDLC the data is self-clocked so the clock signal is derived from the signal line. THe clock syncronization requires regular re-syncing via a "sync-byte". SInce there is a potential that the data could be carying data that is the same as the "sync-byte" the SDLC protocl dictates that the sync-byte can never be transmitted in the data packet so "Bit-stuffing" is used where extra bits are inserted to prevent false sync-bytes.
Bit-stuffing requires manipulating the data going out and processing on the way in.
I spent some time working on fast LabVIEW code that would implement bit-stuffing. At the time I was working with 400 MHz PC. In my case I had to handle 8 channels at 2 MHz so PC's from that era simply could not keep up with all of the work for 8 ports.
So the OTS is worth concidering.
THe other bonus I picked from the Comm-Tech approach was they exposed functions that let me atack the physical layer for testing (inserting errors).
And of course there is another idea...
FPGA can be clocked at 40MHz so with the chip mentioned above, you could code up your own SDLC interface using FPGAs.
So have fun and please post back to let us know how you decide to proceed. It will help others that follow in your foot steps.
Thank you,
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction
Similar Messages
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Elvis: Is It possible to use the Function Generator and the Oscilloscope simultaneously?
Hi,
We are using the NI Elvis to output a function or a sine wave at a certain frequency and using the oscilloscope on the same board/elvis to read a modified signal. Is this possible? Can we use both the Function Generator and the oscilloscope at the same time? Please help. The oscilloscope would be reading signal from an accelerometer. Thank you in advance. We have no VI as we do not know which to use and if they are possible.Hi,
There is no problem using the Function Generator and Oscilloscope
at the same time with NI ELVIS. Using the NI ELVIS soft front panels (Start
>> Programs >> National Instruments >> NI ELVIS 3.0 >>
NI ELVIS – see picture attached –‘NI ELVIS soft front panels.JPG’), you can choose
to open more than one instrument at a time. We do this by opening one
instrument, allowing it to begin, and then opening another. We can also program
in LabVIEW using more than one instrument at a time by placing down multiple
Express VI’s taken from the NI ELVIS pallet on the block diagram (see picture
attached – ‘ELVIS Express VI's (LabVIEW).JPG’). One note when doing this,
please see KB 41ODPHX1
for an example of how to program in parallel. If you do not wire the ‘stop’
terminal of the express VI’s, you will get the error described.
David L.
Systems Engineering
National Instruments
Attachments:
ELVIS Express VI's (LabVIEW).JPG 74 KB
NI ELVIS soft front panels.JPG 56 KB -
VIs for Agilent 33250A (function generator) and SR-844 (lock-in)
I am new to Labview. I was unable to find VIs for Agilent 33250A (function generator) and SR-844 (lock-in). Can someone help me find these?
Solved!
Go to Solution.What did you actually search for? I just went to the Instrument Driver Network, entered '33250A', found it's driver, entered '844', and also found it's driver. I did not try this from the Tools menu in LabVIEW but it should also have found them.
-
Help needed - ABAP for function modules and routines.
Dear BW gurus,
Hope everyone is doing great.
I gotta project recently and we are going live in 3 weeks.My BWLead is getting rolled out in a week and he has to make the knowledge transfer to me ASAP.The bottle-necking thing is I need to have a good idea about the function modules and routines.So I request our SND community to help me out with good ABAP documents for function modules,routines and query.
my mail id is [email protected]
Thanks in advance
Have a nice day
Regards
sathiyaHello Sam,
You can create function module in ABAP using tcode SE37.
For more informations on ABAP:
http://help.sap.com/saphelp_47x200/helpdata/en/c9/5472f6787f11d194c90000e8353423/frameset.htm
Use http://help.sap.com
and also use <b>ABAPDOCU</b> transaction.
Check these links also...
<b>Online PDFs:</b>
http://easymarketplace.de/online-pdfs.php
<b>ABAP HELP</b>
If you check these links, you can find many example programs.
http://www.sap-img.com/abap.htm
http://www.sapdevelopment.co.uk/tips/tipshome.htm
http://help.sap.com/printdocu/core/Print46c/en/Data/Index_en.htm
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Workflow
<http://www.sap-img.com/workflow/sap-workflow.htm>
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Table control in BDC
http://www.sap-img.com/abap/bdc-example-using-table-control-in-bdc.htm
SAP Scripts:
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http://cma.zdnet.com/book/abap/index.htm
http://www.sapdevelopment.co.uk/
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http://juliet.stfx.ca/people/fac/infosys/abap.htm
http://help.sap.com/saphelp_46c/helpdata/en/d3/2e974d35c511d1829f0000e829fbfe/frameset.htm
http://help.sap.com/saphelp_46c/helpdata/en/d6/0db357494511d182b70000e829fbfe/frameset.htm
http://www.henrikfrank.dk/abapexamples/SapScript/sapscript.htm
http://www.sapgenie.com/abap/example_code.htm
http://www.geocities.com/SiliconValley/Campus/6345/abapindx.htm
http://help.sap.com/printdocu/core/Print46c/en/Data/Index_en.htm
http://help.sap.com/saphelp_40b/helpdata/en/4f/991f82446d11d189700000e8322d00/applet.htm
http://www.sap-img.com/abap-function.htm
http://www.sapgenie.com/abap/code/abap19.htm
http://www.sap-img.com/abap/more-than-100-abap-interview-faqs.htm
http://www.planetsap.com/Tips_and_Tricks.htm
http://help.sap.com/saphelp_40b/helpdata/ru/d6/0dc169494511d182b70000e829fbfe/applet.htm
http://www.henrikfrank.dk/abapexamples/SapScript/symbols.htm
http://www.henrikfrank.dk/abapexamples/index.html
http://sap.ittoolbox.com/documents/document.asp?i=752
http://members.aol.com/_ht_a/skarkada/sap/
http://sappoint.com/abap/
http://members.tripod.com/abap4/SAP_Functions.html
http://members.ozemail.com.au/~anmari/sap/index.html
http://www.planetsap.com/Userexit_List.htm
http://www.planetsap.com/Tips_and_Tricks.htm
http://www.kabai.com/abaps/q.htm
http://www.planetsap.com/Userexit_List.htm
http://help.sap.com/saphelp_bw21c/helpdata/en/c4/3a8090505211d189550000e829fbbd/frameset.htm
http://www.sapgenie.com/abap/bapi/example.htm
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http://www.sap-basis-abap.com/index.htm
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Status Icon [ALV,Table Control,Tab Strip]
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Uploading LOGO in SAP
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LSMW
http://www.sap-img.com/sap-data-migration.htm
http://www.sapgenie.com/saptech/lsmw.htm
http://sapabap.iespana.es/sapabap/manuales/pdf/lsmw.pdf
http://www.sap.info/public/INT/int/glossary/int/glossaryletter/Word-17643ed1d6d658821_glossary/L#Word-17643ed1d6d658821_glossary
http://www.consolut.de/saphelp/sap_online_help.html
http://www.sap-img.com/
http://www.sappoint.com/
http://www.sapdevelopment.co.uk/
http://www.allsaplinks.com/idoc_search.html
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Thangesh -
Acquire waveforms from function generator to oscilloscope
I have a problem. We constructed a virtual function generator and a virtual oscilloscope. It's working well, the oscilloscope is displaying the (almost) correct data. My problem is that the waveform displayed in the oscilloscope vi is always sine, although the selected waveform in the function generator is already different.
I should replace the constant 'zero' with something so that the cases will change in order for my oscilloscope to display different waveforms. Is there a way to acquire the values of the constant enum, for instance, from another vi to this vi?Yes, you would need to replace the constant with a control. Once you do this, in the main VI you simply do a right click on the subVI's terminal and select Create Control/Constant that but you cannot change it as the subVI runs.
-
How can i add one wave in in our Function generator example?
how can i add one anotehr wave in our function generator example. i want to use superposition and add one more wave to our first wave in function generator and see the result.thanks
Hi hood1,
2 options:
1) You can add many waveforms by combining them into one Array.
2) Use the Waveforms tools, that give you many option for adding waveforms. one after the seconed or adding the Y array of a waveform to other Y array of second wave form, and so on...
Hope it Helps... -
Hp 3311 A function generator GPIB
Hi, I've a Hp 3311 A function generator and I'd like to control it by GPIB. I'd tested with the example in labview "GPIB.vi" but when i send it a command, pej "APPLIN 1.0E+3, 3.0, -2.5" it doesn't work (It makes only a sound "Bip" ).
Does anyone knows why the function generator doesn't generate the signal?
Note: When i send it the command IND?, the instrument returns the name "Hp 3311A", but when i send another command it doesn't work.
Thanks. Regards, peliasrojo.Hi. I don't use the drivers, I'm using the example GPIB-VISA. I'm be able to change the type of function (sin, square, etc) but when i try change the frequency or the others parameters it doesn't work.
I've attached the program (v2011). The program only tries to apply a square signal with visa commands.
The manual shows an example of a sine function: "APPLIN 5.0E+3, 3.0, -2.5" that generates a sine function of 5kHz, 3Vpp and an offset of -2.5V.
Thanks, regards Peliasrojo
Attachments:
GPIB-VISA (modificada).vi 11 KB -
VB/C# Function Generator Example
Hello,
I have a NI-5401 Function Generator and a NI-5112 Digitizer for hardware. I would like to use C# to output a signal from the Function Generator to the Digitizer and see the results on the CWGraph control. Is there any sample (in Visual Basic if C# not available) that demonstrates the appropriate ActiveX controls and some basic functionality similar to this?
Thanks in Advance!
DerekHi,
You may want to take a look at the following:
C:\VXIpnp\WinNT\nifgen\Examples\VisualBasic
Sincerely,
Sastry V
Applications Engineer
National Instruments -
I produce a sinus-signal with the basic function generator
and i would like to write the x- and the y-values in a simple file
for comparison with values in other files.
First i used the "write measurement file" and i could write it
properly in a *.lvm-file, but i would like to have it in a *.txt
respectively in a *.log-file.
But when i try it with arrays_functions or waveforms_functions
i always get only the y-values, sometimes x(0) as a time-stamp
but not the proper x-y-values.
Thanks for your help!!!!
JaninaHere's something that should work. Since you want time as HH:MMS, everything has to be a string.
To save to a single file every day, you will have to add some code that looks at the current date/time. For example, you could convert the date/time to a string and make it part of the file name.
Attachments:
Save Time and Data.vi 20 KB -
Sending waveform to function generator?
Hello all,
I am using an agilent 33205A function generator and require it to use a
special driving waveform. Currently I load the waveform using
this HP Benchlink software. I would like to automate this in the
startup of my vi. Is there a way to download a "home-grown"
waveform to the function generator using labview?
Thanks,
Azazal
Azazel
Pentium 4, 3.6GHz, 2 GB Ram, Labview 8.5, Windows XP, PXI-5122, PCI-6259, PCI-6115If you're using the driver from here, then use the function called ag33xxx - Arbitrary Wfm Ops. You will have to create the waveform in the form of a 1D array. Look at the high level example called ag33xxx - Arb - Application. I don't see a function in the driver that allows you to output a defined waveform so you may want to look in the instrument manual to see if there is such a function. If there is, then it should be a simple matter to read it and then place the values into LabVIEW as a constant or something you read from file.
-
I would like to buy an ipad for a friend of mine that lives in Santiago,Dominican Republic. How and what do I need to do as far as set up of the ipad to make sure that it functions efficiently and properly in Santiago,Dominican Republic? The availability of wi-fi is not very good, so should I buy an ipad model that has wi-fi and cellular capability? I am quite new to all this technology so I would appreciate it very much if someone can explain step by by step and in simple terms how the ipad needs to be set up to work in this country.
The Smart Cover only protects the front screen. You'll get scratches on the back plus it provides no protection for a small drop.
I added a screen protector as it was cheap insurance protection.
For my iPad 2, I bought an Adesso case/keyboard model WKB-2000CD http://www.adesso.com/en/component/content/article/49-coming-soon/455-wkb-2000cd .html Works great & looks good. The keyboard is easier to use than Apple's on-screen keyboard. Do a Google search using the model number to get the best price. About the same price as Apple's covers & it covers the whole iPad. Although the new iPad is slightly thicker, it should fit this case.
Cheers, Tom -
Oscillioscope and function generator
Hello,
How difficult is it too create a virtual oscillioscope and a function generator that outputs through ethernet or usb to some NI module (Chassis, analog, digital etc) that will send signals to a circuit? So, basically instead of having an oscillioscope or a function generator, you create a virtual one on labview and can send signals to the circuit in the real world. Is that even possible? And if it is how hard do you think the task would be?
Thanks in advance for all the input!So I happen to have a myDAQ at home and I thought I would try to use it as a scope. Checkout this video after a 1:30 for a demo of some of this software. The software it comes with has all the test panels for various instruments for scopes, DMM, function generator, aritrary waveform generator and several others. The hardware also appears as a normal DAQmx device if you so choose to write your own software.
Honestly it isn't half bad. Maybe it's because the software mirrors normal scope functionality but I was able to see my signal and understand it, when I had no other hardware that was capable. It won't replace a desktop scope but it's what I had on hand.
Unofficial Forum Rules and Guidelines - Hooovahh - LabVIEW Overlord
If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously. -
How to review functional specs and what are points need to prepare
Hi ,
how to review functional specs and what are points need to prepare as questionaire..please do needful helpHello
It seems you haven't had a chance to view the forum [Rules of Engagement|https://wiki.sdn.sap.com/wiki/display/HOME/RulesofEngagement] yet. I have provided the direct link for you.
Please share SAP PI technical specs
Please familiarise yourself with the Rules of Engagement. This thread is being locked.
Regards
Moderator -
Need BR's Functiona and Cmds--- please help me
Hi All,
I need all the functions and cmds that are used in BR's and calc scripts in Essbase and Planning...
I'm attending interviews so I need them very very very urgently
if you have doc for the sam eit would be a grt help for me... for version 11.1.2
Please this is very urgent for me...
VijayIf you extract the files and then open index.html it will open the document catalog
Go to the essbase section - Technical Reference - this will contain calc script commands and functions.
Go to the Financial PM application section - Hyperion Business Rules - Administrators guide will contain further information about Business Rules
Cheers
John
http://john-goodwin.blogspot.com/ -
Hi All,
I need all the functions and cmds that are used in BR's and calc scripts in Essbase and Planning...
I'm attending interviews so I need them very very very urgently
if you have doc for the sam eit would be a grt help for me... for version 11.1.2
Please this is very urgent for me...
VijayThey are all in the tech ref - http://download.oracle.com/docs/cd/E17236_01/epm.1112/esb_tech_ref/frameset.htm?launch.html
or the hbr admin guide - http://download.oracle.com/docs/cd/E17236_01/epm.1112/hbr_admin/frameset.htm?launch.html
Cheers
John
http://john-goodwin.blogspot.com/
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