viWrite abnormal return on retCount

[ronnyyong]

Hello,

I having problom to locate where is the fault from

I create a small program doing looping on retrieving
"*IDN?" from an instrument.

sometime the retCount& variable return 0 bytes and cause time out error to my program (intermittant)

I having a hard time to find out is this GPIB card problem or driver or my program.

can someone help?

my program listing

viWrite(GPIB0::2::INSTR,"*idn?",5,retCount&)

[RayFarmer]

Hi,

Why are you looping and are you performing the Read to retrieve the return data from the instrument?

Regards

Ray Farmer