Terminating Resistor on NI PCIe-8433?

Hello, can anyone help me find the terminating resistor on the NI PCIe-8433  2-Port Isolated Serial Interface for PCI Express card? We are doing RS-485 communications and there should be a 120-ohm resistor on both ends of the link. Does anyone know if the terminating resistor is install by default or one must add it?

Thanks,

Joe