Difficulty in reading GPIB device(power meter)

I am using the following Vi attached. i am generating array of frequency writing it to the signal generator with GPIB address 28.afterawards reading powermeter with GPIB address.and finally writing it to the file.
the problem is some times this GPIB read does not work properly. i get error from the power meter. in the read array it displays trigger or Nrvs or some thing different. i thought may be it is due to initializing of power meter. i send SC1 command for power meter initialization. but it does not work. why ? i attached the manual of power meter and signal generator.
thanks for some help
Attachments:
27_10.zip ‏57 KB
manual.zip ‏13855 KB

yes you are right.but if i just execute this driver and afterwards i execute my VI i get some reading from power meter in the form of an string array. it is like this i write an array of frequencies to signal generator at GPIB address 28.and then other device(power meter) is connected at GPIB address 13.
this device returns reading in the form an array string. i thought that i must send/write some command to GPIB 13 device (power meter), so that it starts sending data.this is i am doing in my VI by sending SC1 command. may be i am using wrong command or may be i must send some sequence of command.
the problem with executing the driver, that you mentioned is that i have to execute this driver VI all the time just before my VI.if i execute this driver VI/DL
L then every thing is fine and my VI sends and read reading according to my wish. but what happened if all these devices are initialized or reset,my VI does not run any more. and because i dont know which part of this driver VI cause this activation to react, i just have to blindly execute the driver every time without understanding what should i do in my VI that i dont need to execute the driver any more and this VI would be independent of driver VI.
thanks

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