Hi All I am new to Labview hence need some help. I am trying to develop an application which reads some data from a Wireless Sensor Network (WSN). The WSN consists of base station connected to the USB port which recieves data from other sensor nodes. The data comes in a certain format. Node name, temperature reading, humidity reading etc. I want to read the data from the serial port and based on the Node name, i want to display the information for each node in a listbox connected to a subpanel . Therefor allowing the user to access the different nodes using a listbox. So if a new node is detected then a new vi is created for that node and added to the listbox and displayed in the subpanel. Or the user can acces the different nodes available by scrolling throught the listbox. Since all the nodes have the same sensors on board i have decided to use a single . I can read the data using the serial port, parse the data to detect which node it is and also what the sensor readings are. I have created a template VI for the sensor node. and can create multiple subvi using the template. The problem i am having is how to update the instances created using the template. Each instance of the template should have a unique number, how can i acces this number. Also how to keep the listbox updated. I Would be greatful if someone could help to solve this problem either by suggesting a new way of doing this or by pointing out what i could do to solve this problem. Raza

LabVIEW

how do i update a Vi created using a template

uraza2001 wrote:
Hi Ben

Sorry to bother you again, got a question...

For every node i will have an instance open using the template vit. I can save the names of each instance of the vit, for example "graph_template 617.vi" into an array. Is it possible it open the instance and update it ? Ive tried it once using the open Vi reference and i am getting Error 1004 vi not in memory. Is there a way around this. Or is this not possible

Many Thanks

Raza

That message means what it says, the VI is not in memory.

LV will remove a VI if all refs to that VI are closed. My templates normally open a ref to themselves so they can keep themselves open.

THis Nugget has functional code that uses a template to crate multiple instances. It may help you figure what is going wrong.

Ben

Retired Senior Automation Systems Architect with Data Science Automation LabVIEW Champion Knight of NI and Prepper LinkedIn Profile YouTube Channel