I have example_bc7a.c running on a PCI-1553 using the external bus under Visual C++ 6.0. Although time outs seem to be occuring, there is no indication in the status word of no response. The status word is always zero.
Check that the bus is properly terminated. When the external bus is enabled, the transition cable plus terminators should be connected. With the internal bus enabled, the transition cable is not required.