NI VISA Read function not working

[REU_student_01]

Hello! 

I am fairly new to LabVIEW and am having trouble allowing my computer to communicate with my AMI 286 Liquid Level Controller, which is connected via a serial communications port. When I test supported SCPI commands in NI MAX, the write function works, but read and query do not.

 

I am using commands specific to the AMI 286 according to its user manual: http://www.americanmagnetics.com/support/manuals/model286.pdf

Still, these commands do not work in this LabVIEW program either.

Please help.

Any direction is appreciated!

[GerdW]

Hi REU,

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@REU_student_01 wrote:

I am using commands specific to the AMI 286 according to its user manual: http://www.americanmagnetics.com/support/manuals/model286.pdf

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Unfortunately the website is just responding with "404"…

I guess you forgot to include some "end of line" chars (aka TermChars) when sending the command. What does the manual mention to append to a command(most likely something as CR+LF)?

When you start a serial communication you should use SerialPortInit instead of VISAOpen. And please watch this video!

[crossrulz]

I would first verify you are using the correct baud rate.  The default is 9600.

In LabVIEW, you should use the VISA Configure Serial Port instead of the VISA Open.  This will ensure you are using the correct serial port settings.  All of the defaults should work, so you should only need to wire up the VISA Resource.

Additionally, you likely need to add a Carriage Return and Line Feed characters to the end of your commands.  The device needs those termination characters to know when the receiving command has ended.  In LabVIEW, you just concatenate the End Of Line character to your command (assuming you are using Windows).  In MAX, add "\r\n" to the command.

[crossrulz]

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@GerdW wrote:

Unfortunately the website is just responding with "404"…

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The link worked just fine for me.  Perhaps it's a region issue?

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@GerdW wrote:

And please watch this video!

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Whoever made that video is a freakin' genius.  Lot's of good info.😁

[GerdW]

Hi Tim,

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@crossrulz wrote:

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@GerdW wrote:

Unfortunately the website is just responding with "404"…

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The link worked just fine for me.  Perhaps it's a region issue?

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Not for me:

Those "AmericanMagnetics" also are not capable of signing their website correctly:

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@crossrulz wrote:

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@GerdW wrote:

And please watch this video!

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Whoever made that video is a freakin' genius.  Lot's of good info.😁

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I link that video quite often in the last days. Thanks that genius made it public! 😄

[jorgemondadori]

just to comment that i own the guy from the video getting my CLAD. is daily CLAD being updated? that was so fun!

EDIT: not because he did that, but because usually had good explanations