Thang Nguyen

QUOTE(Neville D @ Mar 30 2007, 01:10 PM)

How about some example code or a quick screen shot?

Neville.

I attach here the picture of creating the queue and destroy the queue.

@ AnalogKid2DigitalMan

Thank you for your answer. I know about the 7805, but I usually use it to regular the power source as well as convert from 9V to 5V. My system is used in transportation with a independent battery for a long time, so I want to limit the power consumption as much as possible.

Thanks again.

Hi,

I have a problem with the queue. After creating and using the queue to pass data, I try to flush queue then destroy it. But I meet this error:"Error 1 occurred at Release Queue in ...". I don't have much experience when working with a queue. Please give me some recommends on this issue.

THank you in advance for your time of reading and answering this question.

Thang Nguyen

Hi Chrisdavis,

I forgot about the AI-110 :headbang: . The current for the system is really small about 100mA. In this case, if I have the battery connect to the system, how should I connect to the AI-110 as a current source to measure the current?

I also need a voltage converter from 12V - 5V. Because this is a low power system, I want to look for a good converter. Could you recommend me any product?

Thank you so much,

Thang Nguyen.

QUOTE(chrisdavis @ Mar 19 2007, 09:59 PM)

The http://sine.ni.com/nips/cds/view/p/lang/en/nid/11581' target="_blank">AI-110 is a good module for high resolution, slow speed (1 per second at best) analog input measurements. Its manual has instructions on how to set it up to read typical industrial contol currents. I don't think that is what you want here though. If you want to measure high currents, which my be present in your battery system, you'll have to convert your current to voltage using a known value of resistor (I think). I can't tell you what resistor, it will depend on the maximum amount of current you expect to measure...

Hi,

I am working on a project in which the power consumption is the critical issue. I want to use LabVIEW to measure the power consumption of the battery. I already have the Compact Fieldpoint. So what I think is I need an instrument to convert the current to the input of the FP (ADC). Could anyone tell me which device I should use to do this?

I highly appreciate your time for reading and answering this question.

Thang Nguyen.

Thank you for your answer!

I have another question. When I use destroy VI, I always meet the error about flush queue. I looked into your example I see that you change the error out connection:

Is there any problem with this solution? I just want to make sure about this.

Hi,

I have a question about the destroy VI in the SimpleLogger.Demo.vi. In the comment, authors says that it destroys the simpleLogger also closes the DataIO and Store objects. But I don't see any destroy VI of the DataIO and Store object. I don't quite to understand this, please help me.

Thank you

Thang Nguyen.

QUOTE(Ami @ Feb 28 2007, 01:12 AM)

As always Kurt, you are correct! Thang took over my LabVIEW projects in the company and is using the GOOP Developer. I moved to other projects. I'd appreciate if you'll help him with the wonderful GOOP Developer like you've helped me.

Thanks,

Ami

To Ami: Nice to meet you here

I highly appreciate all of your helps.

I think I found my bug. In my program, I use the same VI which transforms from one kind of cluster to another kind of cluster. The problem is I use the same VI for different array of different device. But when I check the input and output, both of them are the same.

Can I use the same VI (normal VI not from GOOP) as multiple clone or I have to rename it? I try to use reentrance, not quite understand, but I see the same result.

Thang Nguyen

Thank you everyone, I know that I can create multiple instances for a class by using inspector. There is another bug in my program that make me think that it can not create multiple instances.

Sorry, I do not use LabVoop. I am using GOOP. I attach here the way I try to create multiple instaces on one class.

Hi all,

My project is working with different device with different type of communication. Each device has different speed of acquiring data base on type of connection.

I have already created a class DataIO with different child class correspondent with each kind of device because each device has different read VI.

Now I make another class called Pooller which in its process VI will call the Read VI in the DataIO class and pass it into an array. The problem is because I have different speed for different device, I want to have different process run simultaneously to read data from each device. I try to create multiple instances on the same class and assign different type of device for each instance, but it's not work. I did like this because I still think it like object oriented programming in C.

My question is can we create multiple instances on one class? Or we have to create different child class for each instance.

Thank you in advance for your time reading and answering this topic.

Thang Nguyen

QUOTE(JFM @ Feb 22 2007, 03:16 AM)

Or just drag the updated VI to the "type specifier VI Refnum".

You might also have to right click on the "call by reference node", and select "adapt to type" (or something similar), to get the node working correctly.

/J

To TCPLOMP and JFM: Thank you so much, I can change it now. :thumbup: .

Hi,

I created a parent class and some child classes having the same data which is a cluster type def. In my application, I call the "create by reference" VI of parent class with the path to the "Create" VI of the child classes and pass a cluster data.

After change one element in this type def, I use the apply change for the all clusters. The problem is the "type specifier VI Refnum" did not change, so I can not connect the new cluster to the call by reference node anymore.

I need to update the "type specifier VI Refnum" but I don't know how to do that.

Thank you in advance any help.

Thang Nguyen

Hi,

I am currently working on a project which acquires data from different of devices. They are connected by serial, ethernet communication. I think about the case that in the operation the connection may be disconnected. I am thinking a method to handle this case. I am still new in the industry application so I don't have much experience about this issue. Please give me some idea about sloving this problem.

Thank you in advance for your time reading and answering this topic.

Thang Nguyen

QUOTE(ashishuttarwar @ Feb 12 2007, 11:16 AM)

Thang,

I am assuming that you are communicating to the power meter via serial port.

It's true that I use the serial port. The problem, I think, is about the time out number. I don't know how to do it right here. The problem is I can read the data well in the highlight execution mode but not in the normal. It's weird.

Thank you!

Thang Nguyen

Hi,I am doing a project with the Yokogawa wt1600 digital power meter. I meet a problem when trying to use the read VI. When I run the program in the Highlight execution, it's can read the data well, but when I read it in normal mode, I meet the error. It looks like the program meet the time out with no receive message. Is there anyone meet this case before?Thank you so much for your time.Thang Nguyen