How do I use multiple GPIB cards in one computer?

I have two GPIB cards installed in my computer. One has aprimary address 0 and the other is 1. The card with adress 0 works fine but when I try to communicate with some instrument via the second card, the instructions are not carried out. However MAX ha detected the presence of instruments on both the cards, but it is only that when the second card(address 1) is used the intructions are not carried to the instrument. Please advise on how to select the card while sending an instruction? Or is it that I can use only one card at a time??

When you say that your commands aren't carried out, could you describe what commands you are sending, and what error is being returned?
When you say that you cannot communicate with the second instrument, are you using the 488.2 Communicator in MAX?
Did you make sure that all the settings for the second GPIB board in the properties page are correct?

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