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Found 5 results

  1. How do you decode, unpack a flattened string in python which was sent by a LabVIEW TCP server? I want to exchange data via loopback. Therefore I take a sine wave and flatten it to string and sent over the network Simple TCP - ServerSINE.viSimple TCP - ServerSINE.vi. Then I have to decode the incoming data in a way that I have the correct numerical values like when I plot them in LabVIEW. I did this so far in python_client.py but the values are wrong. Does anyone know how to work with the transferred Data in python?
  2. Hello, Could you please share your thoughts about problem shown below? Thanks in advance. Software used: LabVIEW 2013 f2, 32 bit DSC 2013 Problem: When trying to read a value of tag from third party OPC server which is not widespread software using NI DSC OPC client we got empty data. The type of tag in OPC server is Array of U16 and OPC server continuously writes array of values into that tag. However, NI DSC OPC client (and Distributed Systems Manager as well) defines type of that tag as String, thus can not read value of that tag (I suppose that NI OPC client is trying t
  3. I need to find a transport for message objects that allows two way communication without polling but is limited to server side connections only. So, the client can connect to the server but the server cannot connect to the client. First some context: My application communicates over the network using VI Server. My client app (the UI) opens a ref to a VI in my server app (the engine) and sends a message object containing the client app’s machine name and VI server port. The server app then opens a ref to a VI in my client and sends a message object with the reply data. I now have a two wa
  4. Hi everyone, I'm wanting to open up the floor for your opinions and past experiences with designing a network communications architecture. - There will be one server, written in LabVIEW on a Windows based PC. - There will be multiple remote clients programmed in LabVIEW on cRIOs. - All devices will be connected via a wireless network, and all cRIO clients should have good throughput to the server. - It should be designed for bidirectional data flow, however the clients will do most of the talking. - Data sent will be, status packets, images, PDF documents, and other information. - Clien
  5. I am trying to use the HTTP Client VIs to implement a version of the C# code found HERE. Unfortunately there are no NI examples of how the client VIs are to be used and my various attempts to string them together only seem to result in "Error 42" (LabVIEW: Generic Error) from the POST vi, rather than returning the headers and body text. I have also tried using DOTNET calls and was at least able to get the login page returned but could not seem to trigger the login. I switched to the HTTP Client VIs because they offered an alternate hope and I could at least see where to attach a cookie file
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