The FP-1000/1001 Programmers Reference Manual contains all of the commands. Here is the link:
http://digital.ni.com/manuals.nsf/websearch/ee241c7357d3f8ce862567840072f554
The FP-1000/1001 modules use Optomux and Extended Optomux commands. *IDN? will not work.
Regards,
Aaron