Using LabView to trade in the Futures markets.

Hello
I am retired and trade stocks and futures contracts using the TCP read/write
vi's in LabView and the Interactive Broker's API interface .
Anybody doing the same that would like to exchange ideas? I appear to be
the only one on the IB programming forum that uses LabView.
Everyone else seems to use C++, VB, or Java.
Poor guys, they don't know what they're missing.
Leno

Hi Togos,
Can you tell us more about what you are trying to do. This question can be read many ways from an IB API question to just wanting to know about the Event Structure.
If you just want to know how to handle events from the TWS, then you would process those events using an event structure. You might want to take a look at this video about design patterns. There is also a great developer zone here.
Joe Daily
National Instruments
Applications Engineer
may the G be with you ....

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Using LabView to Programatically Specify the Module of a TestStand Step Problems

I am writing a LabView App that generates TestStand Sequences.
When programatically 'specifying the module' of a TestStand Step calling a LabView VI, is it possible to set the values of the parameters passed to the VI by Name? I am currently creating steps fine, but the only way I can set parameter values is by using the parameters index.
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Hi Steve,
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How to use Labview ""buttons"" to functioning the program?

i'm trying to use the ok button to operate the program to add the value in the cluster X Y (millemetre) [which is from the machine vision operation] with the value X Y offset [which i gonna input them myself] but .. i dont' know how to make it done , now i'm trying to use event structure but it's not working
plz give me some advice thanks ... by the way i'm got to make this thing done by 3 days due to my project schedule ... thank you
also this software is to locate the orientation for robot to grip the object by using CCD camera
Message Edited by NuMetal on 01-04-2010 10:55 AM
Message Edited by NuMetal on 01-04-2010 10:55 AM
Solved!
Go to Solution.
Attachments:
Project1.vi ‏97 KB
1.jpg ‏92 KB

Place the Event structure inside a while loop. Have a look at some of the examples that ship with LV, they for sure show this.
Then use the value change event for the ok button (place the button's terminal in that fram to have the latching behaviour set correctly).
You can pass the data of XY to the loop output in the same event frame to read it at the very moment, the ok button is pressed.
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How can I change the names of the Excel Worksheets using LabView?

Hi Everyone...
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Hello,
Yes, you can modify the name of an Excel Sheet with ActiveX property Node or Invoke Node.
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I am trying to use Labview and RP1210 compliant hardware to connect to a truck J1939 bus and receive messages.

I am trying to use Labview and RP1210 compliant hardware to connect to a truck J1939 bus and receive messages.
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Thanks
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Process Failure when communicating over MODBUS using LabVIEW 2011 and DSC

I'm currently trying to read from a PLC's holding registers using MODBUS/TCP. I've confirmed that the PLC is updating the values and responding to MODBUS communication correctly using a third party program called Modbus Poll. However, when I try to poll the PLC using LabVIEW's shared variable engine, I am unable to read any values from the same addresses that I'm viewing with Modbus Poll.
My setup simply consists of a PC connected directly to the PLC over Ethernet, with no router in between. I am using LabVIEW 2011 SP1 with the DSC module.
I opened the NI Distributed Systems Manager to view the status of all shared variables in the Modbus library that I created and I've noticed that the CommFail bit is permanently set to "true". All other variables with a "read" access mode report "Process Failure". I've tried restarting the process as well as stopping and starting the local variable engine with no success. I've also restarted my computer several times to see if any services were failing, but this does not seem to have fixed the problem.
I finally resorted to monitoring communications over the network card that I have the PLC plugged into via Ethernet using Wireshark and I've found that while Modbus Poll is communicating with the PLC, many MODBUS and TCP packets are sent and received. However, when solely using LabVIEW or the NI DSM to communicate with the PLC, there does not appear to be any communication over the network card.
Something that may be worth noting is that I was able to communicate with the PLC and read values from it with the DSM on just one occasion, when I first figured out which addresses I should be reading from. It all stopped working shortly thereafter. Prior to this, "CommFail" was not usually set to "true" with my current configuration. Thinking that it was my firewall, I have since turned my firewall off, but this seems to have had no effect on the problem either.
Any help on this matter would be appreciated.
Solved!
Go to Solution.

Just a thought but I think the register addresses used by LabVIEW are one off of the actual register #. I was using a CRIO as a modbus IO Server and had to shift the register addresses by 1 to get things to work correctly (can;t recall if it was +1 or -1). This is documented somewhere on ni.com but can;t seem to find it now. But here is another link that may help:
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How to implement a callback function using LabView's Call Library Function Node?

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// Function:   SdkSetPropertyEventHandler
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Thanks for your help.
Alejandro
Solved!
Go to Solution.

alejandroandreatta wrote:
I am trying to call a fuction from a SDK.dll library using the Call Library Function Node. The SDK was provided to
me and I do not have the source code, just the .dll and .h files.
The SdkSetPropertyEventHandler function has a callback fuction as one of its parameters. How do I implement the
callback using the CLF node? I am a good LabView programmer but this is my first time using the Call Library
Function Node. I have read all the info I can find on NI's web site and the discussion board but cannot figure
this one out. I am using LabView 8.6.
Basically you do not do that. LabVIEW does not know pointers and certainly not function pointers. What you should do instead is writing a C DLL that implements the callback and also exports a function to be called by LabVIEW that translates between the callback and a LabVIEW user event. Look for PostLVUserEvent() here on the NI site to find examples how to do that.
Rolf Kalbermatter
Message Edited by rolfk on 02-11-2009 08:00 PM
Rolf Kalbermatter
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Testing of IC's in a PCB using LabVIEW

There is a PCB with a lot of IC's. The IC's are mainly buffers,SRAM,PROM, ASIC's, CPLD's and FPGA. None of them are JTAG compatible i.e. no TDI/O pins available. However only one CPLD is JTAG compatible. Is there a way through which I can test the functinality of these IC's using LabVIEW?
Without the JTAG interface, do I have any other medium through which my VI's can communicate with these memory IC's?
one more thing is that I cannot remove any of the IC's from the PCB, they have to be tested while they are present in the board itself.

sumukh wrote:
There is a PCB with a lot of IC's. The IC's are mainly buffers,SRAM,PROM, ASIC's, CPLD's and FPGA. None of them are JTAG compatible i.e. no TDI/O pins available. However only one CPLD is JTAG compatible. Is there a way through which I can test the functinality of these IC's using LabVIEW?--Yes
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It sounds like this is the first time you do this.
You need help beyond LabVIEW if that is the case.
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Macbook Pro use H.264 Format like the iPhone?

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Future Market of Hyperion Essbase

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How to create a software that has a 90milliseconds of inverval of execution using labview?

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