Sending sequential commands to a linear stage motor

[pclab]

I am trying to send commands to a linear stage motor (locally made) using VISA through the serial port. I use LabView 2010 SP1. I could able to send the first command (move forward) and get the desired output. After each successful execution of the command, the instrument will respond by issuing a code. I should read this command before sending my second command (move backward) to the instrument. I do not know how to do this? How should I wait for the code to send my second command? Kindly provide me some input. I have attached my current VI with this post. Thank you.

[GerdW]

Hi pclab,

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@pclab wrote:

I have attached my current VI with this post.

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No, you did not. All we got is an image of a block diagram…

We cannot edit/debug/run images using LabVIEW!

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@pclab wrote:

I could able to send the first command (move forward) and get the desired output. After each successful execution of the command, the instrument will respond by issuing a code. I should read this command before sending my second command (move backward) to the instrument. I do not know how to do this? How should I wait for the code to send my second command?

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Did you do the LabVIEW basics training? You should know how to implement loops and (case) conditions!

On your image: it doesn't make sense to close the VISA reference immediately after writing a string into the transmit buffer of the serial port driver!

[pclab]

I have tried to use the while loop. But is it the better way to constantly read data from the instrument till the desired code is issued? Is there a way to wait for the particular code to execute the next command? I have edited the earlier post to include the VI. Apologies.

[GerdW]

Hi pclab,

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@pclab wrote:

I have tried to use the while loop. But is it the better way to constantly read data from the instrument till the desired code is issued? Is there a way to wait for the particular code to execute the next command?

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It all depends on the device you are communicating with!

Usually you send a command and read the response. Then you parse the response and proceed as needed…

Please watch Tim's video on proper serial Communication!

[pclab]

Thank you GerdW!