The DP700 series power supplies have a single serial I/O port. If you plan on programming the DP700 power supply from a PC you will need a USB to serial cable.
An example is pictured here:
This particular cable is from Trendnet and has TU-S9 printed on it and has a male serial connector. It’s approximately 26” in length. A search for “Trendnet TU-S9” will bring up multiple sources to order from. The DP700 power supplies have a female serial connector so a gender changer will be necessary accessory as well.
