Visa Set Timeout Or Wait Function

Hi guys, I want that my VISA waits for a certain number of seconds doing always the same operation.
The first idea I had is shown in Immagine, after that I saw the Visa set Timeout but I haven't understood how it works.
What I want is that the instrument I'm controlling stays in the :TRACe1:MODE MAXHold (without resetting the comand, so no cicle) until I want.
Which is the correct solution?
Attachments:
Immagine.PNG ‏66 KB
Immagine2.PNG ‏80 KB

Hi Kate first of all thank you for your reply so the second one should be used between the write&read visa function, is it correct? For example when I want acquire the data from the instrument I should give some time between the instruction sent with the Write Visa and the feedback received from the Read Visa, have I understood well?
Another thing about the first immage using this configuration are you sure that the last value that I read from the instrument will be the result of all the things seen from 0 to 20seconds?
You will find the reason of this question watching the immage attached. As you can see the doubt I have is that the output of the image2 is the same of the input of the image1.
To be more accurate the instruction :TRACe1:MODE MAXHold has this function: Maintains the minimum for each point of the trace, and updates each trace point if a new minimum is generated in successive sweeps.
So what I want to see is the final result of the successive sweeps, for example the final result of all the sweeps after 20 seconds.
I hope that this clarify you what I'm asking for.
Attachments:
Immagine.PNG ‏77 KB
Immagine2.PNG ‏77 KB

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0x04 [V358-A3] SAS1068:00008 [slot 8]
0x06 [V358-A3-D0:0] HP Ultrium 2-SCSI T65D
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Module SMDR.NLM is already loaded
Module TSAFS.NLM is already loaded
Loading module TSANDS.NLM
Module BECDM.CDM is already loaded
Loading module B2D.NLM
Module NWIDK.NLM is already loaded
Module NSS.NLM is already loaded
Loading module OFM.NLM
Loading module NRLTLI.NLM
Loading module AD_ASPI.NLM
Loading module NDMPD.NLM
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Novell Open Enterprise Server, NetWare 6.5
PVER: 6.50.08
Server halted Sunday, 6 May 2012 5:38:23.196
Abend 1 on P00: Server-5.70.08: Page Fault Processor Exception (Error code 00000002)
Registers:
CS = 0008 DS = 0010 ES = 0010 FS = 0023 GS = 0023 SS = 0010
EAX = 00000000 EBX = 00204B58 ECX = 896B77E0 EDX = 8A26157C
ESI = 00204B58 EDI = 00000F9B EBP = 8A261DD4 ESP = 8A261DA8
EIP = 8A1E03FD FLAGS = 00010082
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Access Location: 0x00000EB0
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OS Stack limit: 8A25A020
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8A1DFD6B (LSIMPTNW.HAM|(Code Start)+D6B)
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--0097BAC0 ?
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--00000000 (LOADER.NLM|KernelAddressSpace+0)
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--0097BAC0 ?
--8A261EB0 ?
--8A261E44 ?
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--00204B58 ?
--00204B58 ?
8A1FAA64 ?
--0097BA50 ?
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8972FA00 (NWPA.NLM|HAI_Enable_Real_Mode_Access+34)
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--00204B58 ?
8A1FAC47 ?
--0097BA50 ?
--00204B58 ?
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--00204B58 ?
8A1FAC95 ?
--00952180 ?
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--00204B58 ?
8A207658 ?
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--00008100 (LOADER.NLM|KernelAddressSpace+8100)
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--00204B58 ?
--00204B58 ?
8A208ED6 ?
--010824A0 ?
--00000003 (LOADER.NLM|KernelAddressSpace+3)
--00000046 (LOADER.NLM|KernelAddressSpace+46)
--02010002 ?
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--00000000 (LOADER.NLM|KernelAddressSpace+0)
--00951740 ?
--00000001 (LOADER.NLM|KernelAddressSpace+1)
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--00204B58 ?
--00204B58 ?
89729AE5 (NWPA.NLM|NPAThreadRoutine+3D)
--00010002 ?
-896E5110 (MM.NLM|PostponeEvent+0)
8973173F (NWPA.NLM|CDM_MountActivate_Message+EB)
--00000001 (LOADER.NLM|KernelAddressSpace+1)
--00000000 (LOADER.NLM|KernelAddressSpace+0)
--802171E4 ?
--802171E4 ?
80327F6B (MM.NLM|RetryPostponedMessages+237)
--01081A00 ?
--00204B60 ?
--00000F9B (LOADER.NLM|KernelAddressSpace+F9B)
--00204B58 ?
--00204B58 ?
003682B2 (SERVER.NLM|CallAESRoutineWithEsiSet+A)
Additional Information:
The CPU encountered a problem executing code in LSIMPTNW.HAM. The problem may be in that module or in data passed to that module by a process owned by SERVER.NLM.
Thanks,
MC

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Message was edited by:
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Literal: false/true
RPE-01003: An infrastructure condition prevented the request from completing.
RPE-01038: Failed to evaluate expression declare "$LOOP_DETECT$" NUMBER := 0;function "WAIT_TEST" return VARCHAR2 is "ITEM_TYPE" VARCHAR2(4000) := (wb_rt_task_variable.get_value(77109));"ITEM_KEY" VARCHAR2(4000) := (wb_rt_task_variable.get_value(77111));"EVAL_LOCATION" VARCHAR2(4000) := (wb_rt_task_variable.get_value(77112));function "WAIT" return VARCHAR2 is "WARNING" NUMBER := 2;"RETURN_RESULT_NUMBER" NUMBER := NULL;"NUMBER_OF_ERRORS" NUMBER := 0;"SUCCESS" NUMBER := 1;"ERROR" NUMBER := 3;"OK" NUMBER := 1;"FAILURE" NUMBER := 3;"AUDIT_ID" NUMBER := 77113;"RETURN_CODE" NUMBER := NULL;"NUMBER_OF_WARNINGS" NUMBER := 0;"RETURN_RESULT" VARCHAR(64) := NULL;"PARENT_AUDIT_ID" NUMBER := 77108;"OK_WITH_WARNINGS" NUMBER := 2;begin "$LOOP_DETECT$" := "$LOOP_DETECT$" + 1;if "$LOOP_DETECT$" > 2 then raise_application_error(-20001, 'Loop detected calling "WAIT"');end if;return wb_rt_conversions.from_timestamp_tz(null);end;begin "$LOOP_DETECT$" := "$LOOP_DETECT$" + 1;if "$LOOP_DETECT$" > 2 then raise_application_error(-20001, 'Loop detected calling "WAIT_TEST"');end if;return "WAIT";end;begin :result := "WAIT_TEST";end;. Please modify the expression, redeploy and retry again.
ORA-06550: linje 1, kolonne 835:
PLS-00307: for mange deklarasjoner av FROM_TIMESTAMP_TZ stemmer med dette kallet (to many declarations of FROM_TIMESTAMP_TZ matches with this call)
ORA-06550: linje 1, kolonne 828:
PL/SQL: Statement ignored
Minimum_delay: 30
Literal: true
Until_date: 23-05-2009
Literal: true
ORA-01867: intervallet er ugyldig (illegal interval)
ORA-06512: ved "OWB_SYS.WB_RT_CONVERSIONS", line 371
ORA-06502: PL/SQL: numerisk feil eller verdifeil: feil under konvertering av tegn til tall (numeric error or valueerror: error under conversion from character to number)
ORA-06512: ved line 3
Minimum_delay: 30
Literal: true
Until_date: ’23-05-2009’
Literal: true
RPE-02083: Process WAIT_TEST has errored Activities. Dependent objects may not have been deployed. You can use Oracle Workflow Monitor to retry the activities or abort the Process.
RPE-02075: Oracle Workflow failed to process the execution request for Activity WAIT_TEST:WAIT. This may be because dependent objects have not yet been deployed.
ORA-01841: (helt) år må være mellom -4713 og +9999, og ikke være 0 ([whole] year must be between -4713 and +9999, and not be 0)
WB_RT_WORKFLOW_UTIL_10G.Execute_Any_Task(TEST_MOD, WB_IK_20080602_101807_77183, 12489, RUN)
WB_RT_WORKFLOW_UTIL_10G.Execute_Wait(TEST_MOD, WB_IK_20080602_101807_77183, 12489, RUN)
Wf_Engine_Util.Function_Call(WB_RT_WORKFLOW_UTIL_10G.EXECUTE_WAIT, TEST_MOD, WB_IK_20080602_101807_77183, 12489, RUN)
Minimum_delay: 30
Literal: true
Until_date: TO_DATE('23-05-2009','DD-MM-YYYY')
Literal: false
ORA-01867: intervallet er ugyldig (illegal interval)
ORA-06512: ved "OWB_SYS.WB_RT_CONVERSIONS", line 371
ORA-06502: PL/SQL: numerisk feil eller verdifeil: feil under konvertering av tegn til tall (numeric error or valueerror: error under conversion from character to number)
ORA-06512: ved line 3
So thats basically it.
What language settings have you been using for this to work?
Ragnar

VISA Set I/O Buffer Size fails with all but one value on Linux RT

I was unable to initialize a serial port on a cRIO-9030 using a code that works fine on VxWorks and Windows, when I tracked it down to this somewhat strange behaviour;
If you call VISA Set I/O Buffer Size on Linux RT (at least on the 9030 device) you will get error code 1073676424 for all size values other than 0.
That is a bit strange (what will the buffer size be then I might add...), but something even uglier is that if you leave the function's buffer size unwire, you will also get the error (because the function's default is 4096).
MTO

Under the hood VISA is using the POSIX serial interface for Mac OS X (same as for Linux and Solaris). This interface does not support changing the buffer size. Hence, the buffer size is fixed to the internal OS buffer size. The only thing that changing the buffer size will do (for the out buffer) is to have VISA not flush the data after every write. This is a limitation in the serial API for Mac OS X. Therefore, VISA reports a warning.

Using the Wait function in while loops?

Hi,
I have a rather complicated top level VI with about 20 subVIs and the main VI has on big while loop around it and another smaller one inside, basically it runs rather slow and I have no idea how to set the wait function. I mean what factors should I consider..what would be the difference between setting it to 10 and 100 (besides the obvious 10ms vs 100ms)? I just want to increase the performance of the executable, so it is not that slow. Can you offer some hints as to what I need to take into consideration when determining my delay? And also, are while loops the only place that I should use the delay or are there other instances too?

Adding waits is not a fix-all for slow running applications. Its just one thing that can be done to improve things. If you determine that a sub-vi is causing your problems then you need to find out exactly what that vi is doing to slow you down. If its because there is a loop inside it that is running constantly as fast as it can, then a delay in that loop may help. If that is not your problem then you need to look at other ways to boost performance. It sounds like you have alot of locals variables, each instance of a local variable makes a copy of the data that's in the control. If the controls/indicators that you have local variables of contain large amounts of data then you may be filling up memor
y with copies of it.
I suggest that you study the "Performance and Memory Management" chapter of the LabVIEW manual. This can found in the printed manual of the older versions, in the online manuals that install with 6i, or on NI's web site here: http://zone.ni.com/devzone/conceptd.nsf/2d17d611efb58b22862567a9006ffe76/732cec772aa4fbe586256a37005541d3?OpenDocument , which is Application Note 168. This should give you some good ideas of what to look for to improve your performance.
Hope this helps.
Brian

Wait functionality in Workflow

Hi Everyone,
I was trying to implement the wait functionality in a workflow. I did the following.
1) Changed the Node type to Relative Time and value to 1 minute.
2) Changed the status to Timeout in the workflow for that Notification.
3) In my pl/sql package, i have written as follows:
IF (FUNCMODE IN ('TIMEOUT')) THEN
WF_ENGINE.Background('WorkflowItemName', NULL, NULL, FALSE, TRUE, FALSE);
RESULT := 'COMPLETE:APPROVE';
END IF;
Now, even after waiting for more than a minute, the notification is not going to the next level. Can anyone please give suggestions??
Thank you
Jim

Hi,
Let's start with the original post - you don't need to have anything in the code that performs differently in TIMEOUT mode, unless you want specific logic to fire when the timeout transition is taken. As you've found, you need to run the background engine for that item type in order to move the process on.
You can perform whatever logic you want on the timeout transition. Sounds like you want to resend the notification to the original recipient and also to the next recipient at the same time (which could be problematic...). However, there are two ways that you could model this.
1 - Timeout transition returns back to the original notification, so that notifies the original recipient. A parallel timeout transition determines the next recipient and then goes to a different (identical) notification. You then have two notifications open at the same time, so you need to include an "OR" activity so that only one of those can move the process onto the next step. This is not something that I would advocate.
2 - Timeout transition goes to a new PL/SQL activity. In that activity, retrieve the current responder and the next one, and add them to an adhoc role. Then transition back to the notification, but send it to that adhoc role now. The question really is whether you accept a response from either of those recipients, or does one take precedence over the other? If you are accepting a response from either, then do not tick the "Expand Roles" checkbox, and the standard functionallity will process the first response that comes in. If not, then expand the roles and you will need to have a post notification function for the notification to determine what happens for each response.
HTH,
Matt
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How to run vi continuously when VISA read timeout happens

Hello,
I am using LabView 2010 to read an Agilent 6000 series Oscilloscope. The Oscilloscope reads data from another experimental machine which fails occasionally due to sample failure. When the machine fails, it stops sending signal to the oscilloscope and leads to the VISA read timeout error and the whole vi is terminated. Is there a way that I can continuously run the vi when the error happens? For example, when the error happens, it stores the error in the error wire. When the vi read the error code from the wire, it sends a command to stop my experimental machine then stop the vi.
So far, it just simply stops during executing the visa read function. In this case, why do we have error in and out? The vi simply stops when the error happens.
Thanks
Lawrence
Solved!
Go to Solution.

I'll start of with automatic error handling. By default, LabVIEW enables the automatic error handling. So consider the case like the one below,
If let's say the VISA Read returns an error, but you did you pass the error information to VISA Close, what will happen is that LabVIEW will highlight the VISA Read (since the error comes from that function), pause the execution at the VISA Read and an error dialog box will appear. From the dialog box, it will prompt to either continue (Move on to the VISA Close) or stop (LabVIEW will stop the VI at VISA Read)
Now, consider another scenario like this,
By passing the error information from one function to another, let's say if VISA Read returns an error, that error will pass to VISA Close and finally to Simple Error Handler.vi. So Simple Error Handler will generate error dialog box after all the VISA operation is completed. This is called manual error handling (It can be enabled by just wiring the error information from one function to another and terminates at Simple Error Handler).
http://www.ni.com/gettingstarted/labviewbasics/handlingerrors.htm
As for VISA Close, here is the information about VISA Close.
http://zone.ni.com/reference/en-XX/help/371361K-01/lvinstio/visa_close/
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Visa Set Timeout Or Wait Function

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