DDS-3X25 USB To get synchronized waveforms, you must use the optional MULTIPROCESSOR LINK cable. First, disconnect the instruments from PC, and connect them with this special cable. At least, you must connect one instrument to the main interface of the cable. （ In the default setting, the device serial no. of the main interface is No.3 and the others are No. 0, 1 and 2. ） Then, connect them to PC through USB ports and open them in the same application window. DDS-3X25 USB User’s Guide 31