Using Virtual Serial Ports (VSP) on Microsoft Windows XP, Vista, or Windows 7
The HPSDR rig does not have the CAT interface or a separate PTT serial link implemented in hardware so these ports must be virtual. This program is required to allow programs to communicate frequency , mode, CW and PTT data. It is required software that must be installed to operate the digital modes using Fldgi. Learn about and install com0com.