Check host VI is running?

[jatinpatel1489@gmail.com]

Hello All,

I came across a situation where I need to check in RT VI that wheather my HOST VI is running or not? I have no Idea how to implement this.

I would appreciate your help for implementing this condition. 

[crossrulz]

What communications are you using between the RT and Host?

[zou]

Let the host VI send timestamp to RT every second - heart beat.

If not receiveing heart beatfrom host, then it's down.

In addtion, RT can sync to the timestamp at the begining.

[jatinpatel1489@gmail.com]

I use ethernet (shared variable) for communication between RT and HOST. 

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@crossrulz wrote:

What communications are you using between the RT and Host?

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[jatinpatel1489@gmail.com]

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@zou wrote:

Let the host VI send timestamp to RT every second - heart beat.

If not receiveing heart beatfrom host, then it's down.

In addtion, RT can sync to the timestamp at the begining.

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So do I need to compare time stamp sent from host with time stamp of RT? Or there is something direct indication I would get ? 

[zou]

> So do I need to compare time stamp sent from host with time stamp of RT? Or there is something direct indication I would get ? 

That's optional.  If the host is down, you won't get anything.

[RavensFan · Accepted solution]

No, you'd compare the timestamp you got from the last timestamp before that.  They should be different.  If they are the same, then it didn't update it.

[crossrulz]

I agree with the others that a simple timestamp shared variable would be the easiest.  Just create a loop that iterates about once a second and see if the value changed.  If it does, then your host is active.