Communication between VIs

I have 2 VI's which are run at the same time and I need to share data between the 2 I've managed to do it using variables but I have found that it is fairly machine dependant due to how Labview stores and accesses variables. Is there a way to do this other than with variables???
Thanks,
Matt.

What do you mean by "variables"?
Anyway, try communicating with Notifiers or Queues. Look up examples.
Richard

Similar Messages

Communication between Lab view and Controller via USB

USB communication between C8051F320 and Lab View. I try doing methods given in the NI site(http://zone.ni.com/devzone/cda/tut/p/id/4478) and atlast, it gives me error −1073807302 so if any one can answer my question please do post me the details concerned to it.

My devices show up as NI-VISA USB but I'm not sure if that makes a difference and I'm not using USB RAW either. One thing that you can run is a VISA Property node like below and see what it reports. Also, what version of VISA are you using? If you are not using 4.0, you can download it from http://digital.ni.com/softlib.nsf/webcategories/85256410006C055586256BBB002C0E91?opendocument&node=1....
Message Edited by Dennis Knutson on 01-31-2007 07:29 AM
Attachments:
USB RAW Property.PNG ‏3 KB

Communication between the DNS/DHCP Manager and OES Server

No communication between the DNS/DHCP Manager Console and OES server (status,start,stop)
The screenshot shows the tab "DHCP (OES Linux)" in the DNS / DHCP Manager console
in the bottom of the image it shows the state of the DHCP servers.
allDHCP.JPG
The dhcp service is started on all these servers
You can see that the status is known only for four servers.
The button "start/stop DHCP service" works fine on this servers and
the dhcp service can be canceled and also restarted
But the status of the "dhcp service" is not recognized for all the other DHCP servers
and so we can not start or stop dhcp service on these servers.
All servers were installed at different times (last three years) with OES11 and
are upgraded to OES11SP2 with all patches.
The server keto (DHCP_keto) is a new installation OES11SP2 few days ago.
All OES servers were set up identically from me. LDAP, LUM, DMS, DHCP works fine.
Which service on the OES server is responsible for
communication (status indicator) between the DNS/DHCP Manager and the OES serve?
How the status query is performed by the DNS/DHCP Manager?
How can I test the communication to the server on the client (console)?
Which configurationfiles I should be compare on the server?
Thanks in advance
Gernot

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Some problems in TCP/IP communication between PC&DSP

I have programmed a VI for TCP/IP
communication between PC (Client) and DSP (Server), which could be downloaded
at below link. It just achieves some basic features, like send commands to DSP
to set some registers, and receive data or status from DSP. Additionally I programmed
a Sever vi in labview to test the client. You know the real Server is in the
DSP programmed using C language.
My problems are:
1.
I don’t know how to add some “stop”
in the two VIs to get out of the loops, I tried but it didn’t work well.
2.
I’m not clear to add some error
handles, you know when I stop the vi by pushing the round red button to stop the
vi, it turns out some error dialog about TCP/IP.
3.
It is about the TCP/IP. when
the server writes data to connection ID, if the client doesn’t read them, then
where the data goes?
Attachments:
metaclient.vi ‏42 KB
metaserver.vi ‏30 KB

可以通过添加布尔控件来停止循环，同时可以通过变量的方式来同时跳出多个循环。
你的程序肯定存在什么问题，需要的是调试。

Using 1394 to perform communication between two PCs

Hi all,
Does anybody knows how to use a 1394 (firewire) to implement a communication between two computers using Labview ?
Do I need a special toolkit for this ?
Thanks
Eduardo

Currently, if you have installed NI-VISA, you should have the 1394 Passport already installed and running. This gives you the ability to communicate with 1394 instruments via your 1394 instruments. This is important because this helps determine how you will communicate from one computer to another. If you want to use the VISA and communicate using the FireWire INSTR, then you need to find or create drivers for your 1394 ports that allow you to communicate with them as 1394 instruments. There might be other ways to do this, but this is probably the most simple. Once you've got the pcs set up, you can just use VISA to communicate with your other devices.
Logan S.

Communicating between two Computer via USB

Hello,
I want to connect two PCs to synchronize two different LabView VIs running on these Computers.
The perfect way would be, that the VI on PC 1 sends boolean Value to the VI on PC 2, where this value is read out and can start some process.
My Problem is that I do not have a 'normal' network and all serial Ports (but not USB) are occupied.
I would appreciate any advice or suggestion.
One of my ideas is going in the direction of an USB to 9pin serial Adapter plus a null modem adapter/cable. But I have no Idea if this would work.

I would suggest USB-Ethernet adapters and an Ethernet cross-over
cable.
The communications between computers will be faster, and you can
use your software across a larger network later on without
modifications (just change IP addresses). Your communications will be
message based rather than character based, so you won't have to
constantly poll the RS232 port for characters.
Now is the right time to use %^<%Y-%m-%dT%H:%M:%S%3uZ>T
If you don't hate time zones, you're not a real programmer.
"You are what you don't automate"
Inplaceness is synonymous with insidiousness

Communicating between subpanel using main vi

Hi all,
I have three VIs. One main VI and another two VIs that I load the into
the subpanels in main VI. The main VI is used to handle communicating
between these two VIs that load into subpanels. I used queue method to
communnicate between VIs. I want to add data from Panel - Add Data.vi
when I click Add button into multicolumn listbox in Panel - List.vi.
When I run both VIs, the Add button can transfer data into multicolumn
listbox, but it doesn't work when I load them into subpanels in
Main.vi. Can somebody help me to solve this problem.
Thanks in advance.
Attachments:
Communicating between subpanel.zip ‏72 KB

Hi MikeS81;
Actually, at this moment I only want to add data (by using Add button in Panel - Add Data.vi) into listbox in Panel - List.vi. Because both of VIs are load into subpanels in main VI, I used global variables to make it easier, and the important thing that I don't have an idea how to do that. Can you give me a simple examples to do that because to add data into listbox, it uses a ItemNames property which for me it is very dificult... For your second question, later I may be want to send data in both directions.
Thanks for your answer.

Is in PI7.1 possible asynchronous communication between SOAP and ABAPProxy?

Hi,
when method execute_asynchronous has disapeared since XI/PI 7.1, is
there still way how to use ABAP proxy in asynchronous way?
We need to build asynchronous connection SOAP->PI->ABAP_Proxy.
In PI, both interfaces are defined as asynchronous (outbound for SOAP and
inbound for ABAP Proxy).
Despite of this fact, when message is sent, it is processed
synchronous way.
I have set breakpoint in my implementation of method for ABAP Proxy
message processing. When message is sent and breakpoint is reached,
whole connection stays open (between SOAP and PI and between PI and
ABAP Proxy) and waits for processing method (the breakpointed one) to
return. Only when processing method returns, is connection finelly
closed.
If i understand it correctly, this is synchronous behavior. In
asynchronous behavior, as i understand it, should be connection
between PI and ABAP Proxy of application server closed immediately
after message has been delivered. This mean before my processing
method is even called.
The same could be said about SOAP and PI communication. Connection
should be closed immediately after PI has received message. From
definition of asynchronous communication of PI is obvious, that PI
should receive message correctly and close connection to sender system
even when receiver is unreachable. It should deliver message later
when, receiver system is back on line. So why it keeps connection to
sender system open while it waits for receiver?
Why is this happening, when both interfaces are defined as
asynchronous? Could be the reason for this, if APPLICATION
ACKNOWLEDGEMENT is set on by default? If so, how can i change it
to SYSTEM ACKNOWLEDGEMENT, or disable it at all?
Or is this kind of asynchronous communication even possible since
XI/PI 7.1 ?
Processing of message we are sending can take some time, so we dont
want connection pending open while waiting for finish of
processing. Thats the reason why we have chose asynchronous model to
use.

Quote from How to Use the J2EE SOAP Adapter:
"If you select Best Effort, the Web service client will receive a response
message in the SOAP body. Otherwise, the Web service client will not receive a
response message if no error occurs."
"if no error occurs" - that is the problem. In either case he still
waits if some error occure or not. I dont want it. Once PI has
received message, I want the connection with sender to be closed. If
there will be error in communication between PI and reciever, I want
to see it only in PI log. That mean no notification to sender to be
send about that error.
Is that possible?

Communication between Best Buy and Apple

Where is the communication between these two companies? It's frustrating to have NO CLUE if a phone will come in a day or in 5 weeks. Who at Apple is deciding what they end to what stores? Obviously, Best Buy has to pay for the phones. There has to be some sort of communication.
Would it really be that hard for someone high up in Best Buy to communicate with Apple? Maybe a list from each store of their orders and what they are waiting on. Give that to Apple. Apple can give some sort of answer. Exepect this much in this time frame... expect this much later. I mean, something. Instead of leaving everyone in the dark, completely.
Someone at Best Buy corporate has to have SOME clue how Apple is shipping and to what stores. To say no one has no clue at all, is nuts. And if it's true... Best Buy needs to get a clue. DO SOME WORK FOR YOUR CUSTOMERS. At least get some truth, so if we need to go elsewhere, we can. It would be better for both sides.

Apparently since they come on UPS, they don't know when the shipments are coming in or how much. Which I think is bull.
If that's the case, what I want to know is HOW do they know they received the amount they were expecting? If they don't know how much they're getting or when they're getting a shipment, then what's stopping the delivery man from stealing a box, and they wouldn't know any better? Maybe the higher up manager's know, and they aren't allowed to reveal that info, but there has to be a checks system in there somewhere verifying the stock received.

Communication between iViews

How to realize communication between two iViews of the same window but not the same portal page? I tried with using firing portal events but this doesnt seem to work with Mozilla Firefox. Do you have any other ideas?
The sending iView is a portal application the receiving iView a Web Dynpro for ABAP application (so I cant use JavaScript, I guess).
Thanks!
René
Edited by: Rene Guenther on Jan 10, 2008 3:29 PM

Hi Mrkvicka,
To enable communication between iviews you need to use the EPCF .
You can raise an event in the component of the first iview and define an OnClick event.
this event you can subscribe from the other iview
Refer to this link to get a more clear picture
DropDown Selection and EPCF
also refer to
EPCF
hope this helps,
Regards,
Uma.

Communication between jsp and abstractportalcomponent

Hello All
Communication between jsp and abstractPortalComponent.
jsp contains one input text field and one submit button.
when the user clicks on submit button it will call the component and that input value will
display in same jsp page.
how this communication will happen?
Rgrds
Sri

Hi Srikanth,
In the JAVA File,
OnSubmit Event,
String inputvalue ;
InputField myInputField = (InputField) getComponentByName("Input_Field_ID");
if (myInputField != null) {
               inputvalue = myInputField.getValueAsDataType().toString();
request.putValue("textvalue", inputvalue);
request is IPORTALCOMPONENTREQUEST Object.
In JSP File,   to retreive the value,
<%
String textstring = (String) ComponentRequest.getValue("textvalue");
%>
In PORTALAPP.XML File,
<component name="component name">
      <component-config>
        <property name="ClassName" value="classname"/>
        <property name="SafetyLevel" value="no_safety"/>
      </component-config>
      <component-profile>
        <property name="tagLib" value="/SERVICE/htmlb/taglib/htmlb.tld"/>
      </component-profile>
    </component>
Using the code above, You can pass and read values between abstract portal component and Jsp Page.
Instead of this, I suggest you to use JSPDYNPAGE Component for Data Exchange.
Check the [Link|http://help.sap.com/saphelp_nw2004s/helpdata/de/ce/e0a341354ca309e10000000a155106/frameset.htm].
Hope this helps you.
Regards,
Eben Joyson

Communication between : AP and WLAN controller

Hi,
The communication between AP and WLAN Controller is ( Data and Control ) UDP.
Source port 1024 and destination port 12222 and 12223. Actually which device listen to which port or both should listen as control and data can be generated from both the devices.
How does the user ( wireless client) traffic is switched - if user traffic is a TCP traffic. It will be sent to WLANC and then WLANC forwards it to respective VLAN or default gateway ( depending upon the destination in the packet ).
Please explain / share the experience.
any link on cisco.com
Thanka in advance
Subodh

"the LWAPP Control and Data messages are encapsulated in UDP packets that are carried over the IP network. The only requirement is established IP connectivity between the access points and the WLC. The LWAPP tunnel uses the access point's IP address and the WLC's AP Manager interface IP address as endpoints. The AP Manager interface is explained in further detail in the
implementation section. On the access point side, both LWAPP Control and Data messages use an ephemeral port that is derived from a hash of the access point MAC address as the UDP port. On the WLC side, LWAPP Data messages always use UDP port 12222. On the WLC side, LWAPP Control messages always use UDP port 12223.
The mechanics and sequencing of Layer 3 LWAPP are similar to Layer 2 LWAPP except that the packets are carried in UDP packets instead of being encapsulated in Ethernet frames."
Taken from "Cisco 440X Series Wireless LAN Controllers Deployment Guide"

Communication between HP eprint and Google Cloud Print

Hi,
the communication between HP eprint and Google Cloud Print seems to be broken. At least for me.
The documents do get printed when I print vio Chrome browser or Cloud Print dashboard -- but the status in cloud print remains as "submitted". It seems like somehow the HP eprint status doen't get reported back to cloud print. In HP eprintcenter the log says "printed".
Well, I wonder who will take care of this problem ... (Hope it will not result in fingerpointing only ...)
Thanks for your support!
Best,
George
This question was solved.
View Solution.

Are you able to log back in later and the status at Google Cloud print update to reflect the true outcome of the print job? Or does it just remain as "submitted". Otherwise, if it is printing and showing in the log at ePrint Center (EPC) as printed, the issue would not be on the ePrint side but on Google's
I am a former employee of HP...
How do I give Kudos?| How do I mark a post as Solved?

Communication between two clients

In Java Networking, communication between server-client or bwtween server-multiple clients is general. But How will be the communication between two cients, means two clients can send & receive messages to & from each other(being guided by server).

Sorry,
I didn't get your reply clearly.
I want, if Server is running, and two clients(two instance of a same program) are opened, whatever message(string)client1 send to Server,then the Server needs to send those to client2.Again, the some response should come from client2 to client1 thru Server.
How can I implement this?
If you have idea, or some sample code about this, please let me know.
Regards.

Communication between a driver and application.

Communication between a driver and application.
I am writing a driver for a PCI card. I have found very good examples of how the driver should be build.
Where do I find the information about how the user mode application should be talking the driver.
So If you have any idea that will help me, please let me know.

Hi,Sir
This for your reference.
It will create pci adapter device node at /devices .
You can use AP function call ioctl to Communicate with your device driver.
static int
xxattach(dev_info_t *dip, ddi_attach_cmd_t cmd)
int instance = ddi_get_instance(dip);
switch (cmd) {
case DDI_ATTACH:
allocate a state structure and initialize it.
map the device�s registers.
add the device driver�s interrupt handler(s).
initialize any mutexes and condition variables.
create power manageable components.
* Create the device�s minor node. Note that the node_type
* argument is set to DDI_NT_TAPE.
if (ddi_create_minor_node(dip, "minor_name", S_IFCHR,
instance, DDI_NT_TAPE, 0) == DDI_FAILURE) {
free resources allocated so far.
/* Remove any previously allocated minor nodes */
ddi_remove_minor_node(dip, NULL);
return (DDI_FAILURE);
* Create driver properties like "Size." Use "Size"
* instead of "size" to ensure the property works
* for large bytecounts.
xsp->Size = size of device in bytes;
maj_number = ddi_driver_major(dip);
if (ddi_prop_update_int64(makedevice(maj_number, instance),
dip, "Size", xsp->Size) != DDI_PROP_SUCCESS) {
cmn_err(CE_CONT, "%s: cannot create Size property\n",
ddi_get_name(dip));
free resources allocated so far
return (DDI_FAILURE);

Communication between VIs

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