How can I get two GPIB boards to work in one PC?

[Tome]

They indicate no problems in the windows control panel device manger. The National Instruments fails "GPIB interfaces sequentially verified". It is device name GPIB0 at address 0. The Computer Boards device name is GPIB1 at address 1, this device is working. Here is a little twist. I run National Instruments interactive control and do ibfind GPIB0, NO LUCK. Do ibfind GPIB1, it finds it.

[pavanb]

Hello:

The bus supports one System Controller, usually a computer, and up to 15 additional instruments. By default, your GPIB board will be the System Controller, but this is not the same as being the Controller-In-Charge. The System Controller has the ability to become the CIC at any time (there can be one System Controller on a given General Purpose Interface Bus). If your GPIB board is supposed to be the System Controller, then use ibrsc 1 to make sure your GPIB board is configured as the System Controller. If your GPIB board is the System Controller, then use the ibsic function (or SendIFC function) to send an interface clear. This will make your GPIB board the CIC (it also resets GPIB communications on the bus). Never configure your GPIB board to the same a
ddress as your device. You should (almost) always leave your GPIB board configured for primary address 0 and no secondary address. Call ibpad 0 and ibsad 0 at the beginning of your program to properly configure your board's address.

You will find the following web pages helpfull.
http://www.ni.com/support/gpib/max/property.htm
http://www.ni.com/support/gpib/max/maxibic.htm
http://www.ni.com/support/gpib/faq.htm

Hope this helps. If you have any further queries, please let us know.

-NI Support.

[pavanb]

Hello Tom:

Sorry I misunderstood your question.

1. I guess there is a resource conflict going on. But before that, do the boards work independently without the other one plugged in? What does NI-GPIB in control panel say for the field GPIB addr. ( from Configure >> software) Is this being changed after you install the 2nd card. After you have 2 different addresses for the board and it still give you the error try using a different slot. The controller needs to have a primary address of 0. Also the diagnostic that gives the error message should also step you through troubleshooting if you click the help button

2. The problem could also be that you have the wrong driver version for the GPIB card, but if both the cards that you have are the same, then since o
ne works that is not the issue. If they are different you can find the correct driver download at http://www.ni.com/support/gpib/versions.htm, now both the GPIB cards need to work with the same driver.

Hope this helps. If you have any further queries, please let us know.

-NI Support.