why I have to use viOpenDefaultRM before using viOpen?

[jacky Wang]

    why I have to use viOpenDefaultRM before using viOpen? what's the in-depth?

[Norbert_B]

Jacky,

the RM stands for Resource Manager. this one is needed to interface with VISA, because it handles reservation, usage and releasing of interfaces to the instruments.

Norbert B.

[RayFarmer]

Hi,

Also, viOpen requires a handle provided by the Resource Manager as one of its function parameters.

Regards

Ray Farmer