Without further info on the actual board it is just guess work.
But typically motion cards, wether in a PC slot or stand-alone use some kind of RS232 terminal program to download individual commands or complete programs.
Of course the command instruction set has to be known and what is required as to the RS232 protocol.
Some board manuf. will supply a suitable interface program, and many will allow any modem program to work, like Win-Terminal, Qmodem, ProCom etc.