SCPI specific command does not work with VISA with MTX3293

I tried to communicate with VISA, for common commands it works with "*IDN?\n", but when I want to execute a specific command, it gives me an error "VISA: (Hex 0xBFFF0015) The timeout ' wait (timeout) expired before the operation was completed."
I am a beginner with the instrument control part on labview, someone can help me I will be gratefu

i need to communicate with VISA with MTX3293 multimetr , when i run the VISA test pannel with a commun command like "*IDN?\n", it works 

 but when want to execut the specific command  to acquire the continus data from my MTX3293 it gives an error 

VISA: (Hex 0xBFFF0015) the time out expired before the operation was not completed 

im a  beginner with instrument control on LabVIEW , some one help me please 

thank you for all