How to acquire two signal values from the same GPIB

I have a power meter which provides two values,  the power and wavelength simultaneously.  So when I'am giving in the GPIB write command probe a joint command is not provided by ILX light wave. So how can i get the values simultaneously.
 Please help

Hi perumpadapu,
you should read the manual of your device/software. There you should find the answer.
Or ask the customer support for that device.
As long as you don't even provide a name of your device we cannot provide much more help!
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

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