Hi, i unable to read data from data logger (Graphtec GL820), and getting an error

[kartikgeyan.nadarajan]

[santo_13]

Does GL820 support IDN query?

[kartikgeyan.nadarajan]

Hi, sorry i new the forum. it does work from NI MAX

But error start from VISA read block

[santo_13]

So, you need to watch this first - https://labviewwiki.org/wiki/VIWeek_2020/Proper_way_to_communicate_over_serial

[crossrulz]

I am not finding a programmer's manual for your device (I didn't spend much time searching either).  So I will trust that your command it correct.  However, you likely need to concatenate an End Of Line character(s) to your command string before it goes into the VISA Write.  Instruments tend to look for that Carriage Return and/or Line Feed to know when the command is complete.

[kartikgeyan.nadarajan]

[dkfire]

Your write string is not correct. 

Are you sure you are adding a New Line or Carriage Return to the end of the string? 

No one is able to debug your picture.

[crossrulz]

Change the display on your command string constant to '\ Codes'.  It also helps to make the display style visible (right-click->Visable Items->Display Style").  By default, the display style is 'normal'.  So you are not sending a Carriage Return and Line Feed, but literally '\', 'r', '\', 'n'.

[ZYOng]

Agilent Technologies / Keysight Technologies 34970A Data Acquisition Unit - Instrument Driver is readily available.