Hello everyone on the forum!

For some time I have been the owner of ZTEX 1.15x, on the manufacturer's website I can not find information on how to communicate with the module via USB.
I am currently writing simple things in VHDL, but I miss communication with PC very much.
I upload BIT files via JTAG or FWLoader.

Does anyone know what code I need to write on the computer side to send and receive data from FPGA?