I don't have one of those boards, so I'm just going by the documentation that I found on the net.
1) Do you have a USB cable plugged in to the board from your PC? It is required to provide +5 volts to the C1's input circuits.
2) Do you also have a power supply connected to the terminal strip for the output power?
3) Do you have the output Enable pin connected to a 5-volt terminal?
4) Supposedly the board has an LED for each input line and each output line.
So, if EMC2 is sending signals to the board, and you have proper power, then you should expect to see at least the step signal pins on both the input side and the output side blinking. The direction signals may be more or less steady state with fewer changes, so they may be lit or unlit or occasionally blinking.