Then dsa is set to 3.4800, and the virtual port of dsa can be set to 8.4800 or 9.4800. Dsa can automatically search for ports, but it must set virtual ports, not physical ports of the machine. Then it can be set to 8.4800 or 9.4800, and the Khalid map port can point to the virtual port of dsa.
When in use, dsa will output signals to the virtual port after obtaining signal positioning, and Khalid will obtain signals from the virtual port for positioning and navigation.