My GPIB will not control my device.

[Chris Flattery]

I am trying to control a MMR K20 Temperature Controller with my
PCI-GPIB+ card, but it keeps giving me an Error-Need Command in the
NI-488.2 Communicator, and IBERR=EABO.  I have changed the time but I
still get this error.  But the communicator does work for the other
instruments I am using.  What command string do I need to give, or
what do I do to get the GPIB to control this one device.