@JÞB wrote:
Probalby because you didn't read the help file
"When there are multiple GPIB controllers that LabVIEW can use, a prefix to address string in the form ID:address (or ID: if no address is necessary) determines the controller that a specific function uses. For example, to set GPIB controller 2 to talk to a device on address 3, use the prefix 2:3. If a controller ID is not present, the function defaults to controller (or bus) number 0. "
Bus 0 will be the first gpib bus connected to address a device at address 3 on the second controller the address string woud be
"1:3"
If one wanted to use multiple cards and not stack the cables, how can you clear the registry so the Board ID's are not permanently saved? For instance, if you plug in 5 GPIB USB's into one PC, it registers them as Board ID's 0 - 4. When unplugging all GPIB's except for say Board 4, the Board ID will remain at 4 and not jump down to 0, i.e. Board ID is permanently saved in the computer registry and the GPIB's will not function if their respective Board ID's are mixed up (seems to be the OP's issue). I have been trying to solve this for quite some time - I can use multiple GPIB USB's if I keep the Board ID's straight but I cannot unplug them all and then randomly plug them back in, I must painstakingly keep track of each Board ID, even when not in use.
