VISA: (Hex 0xBFFF0038) Bus error occurred during transfer.

Hi,

I am trying to simultaneously communicate 3 different instruments (Keithley 2001, Keithley 2611A, Keithley 224) using GPIB (NI PCIe-GPIB). I checked the connection of these instrument using MAX (shown in the attached image) and it shows that they are connected. However, when I try to simultaneously run the said instruments, "VISA:  (Hex 0xBFFF0038) Bus error occurred during transfer" error occurred.

Also, I tried using just 2 instruments (Keithley 2001, Keithley 2611A) using GPIB (NI PCIe-GPIB), then I tried to communicate with Keithley 224 using a separate GPIB (GPIB-USB-HS), and it works well.

Question: Is there anyway to communicate 3 different instruments by just using GPIB (NI PCIe-GPIB)? I have also attached an actual image of the GPIB connections showing the (NI PCIe).

Thank you,

-Lorenzo