host pxi communication

[DinaDemara]

I'm running with LabVIEW 8.6 (no option to upgrade this lab system).  One other complication is that I have host PC and driver (PXI) in different lvproj files (maybe an artifact of using Simulation Interface Toolkit).  I have tried using shared variables, adapting the example shown in https://decibel.ni.com/content/docs/DOC-30176, but it only works one way (write only on host PC) but not if attempting read/write or read only.  I saw there was an earlier post on this topic, but the resolution was to upgrade to a newer version of LabVIEW https://forums.ni.com/t5/LabVIEW/Deploy-Shared-Variables/m-p/1619816/highlight/true#M585856.

Question is:  what is the best host PC to PXI communication path - shared variables, TCP/IP, UDP?  I think I need to abandon trying to get shared variables to work and move on to a different mechanism, just looking for advice on which direction to head to next.

[hicksc]

Hi Dina

I'd probably look to using TCP as discussed here.

Kind Regards

[DinaDemara]

There are 3 examples.  Do you have a recommendation as to which to start with?

Simple Data Client.vi, Simple Data Server.vi

Data Client.vi, Data Server.vi

UDP Receiver.vi, UDP Sender.vi

[hicksc]

Hi

That really depends upon your requirements.

Have you read the descriptions for each of the examples? 

The first decision which you need to make is whether to use TCP or UDP. A comparison of the two can be found here.

Most simply UDP will provide you with a faster data transfer rate, however there is no means to recover data which is lost along the way.

Once you've decided, I'd go with KISS and use 'simple' data client/server if it's adequate, otherwise look at data client/server.

Kind regards

[DinaDemara]

SIT uses the one closest to the "Simple" example and KISS is best.  However, I don't want to interfere with the model communications used by SIT.  I'm not sure if piggybacking on this channel (port 6011) will interefere.  I can't change any code in the areas with "green labels", so I'll have to put the non-model Host-PXI communications elsewhere. So should I piggyback or open a different port?

[hicksc · Accepted solution]

Hi

I'd use a different port, there's usually far more available then you'd ever need to use.

Kind Regards