Hello Marek,
Open IBIC:
Measurement and Automation explorer >> Tools >> NI-488.2 >> Interactive Control
Go to this webpage:
http://www.ni.com/support/gpib/max/ibic.htm/
Below the screen shot is a list of commands with definitions of the commands and parameters. Type the commands into the IBIC window.
When you write a command to the instrument, try using a simple query that the instrument will respond to. The example used in the example is *IDN?, but that is part of the 488.2 standard and probably will not work for your instrument since it is so old. Look in your instrument's user manual for an appropriate command.
If the instrument does not respond with IBIC, the board was probably installed incorrectly.
Ray K
NI Applications Engineer