AC4.5.4 impossible to connect HL2 serial with MP

ArduCopter Copter 4.5
1

If you activate serial protocol to High Latency 2, and than after you activate this High latency 2 port via MP connected on MAVLINK2 std port and that after you try to connect doing CTRL +T or standard connect to the HL2 serial, MP try to connect you see HUD populating one time, and just after MP loose connexion and put error message as if do not understand the HL2 packet.

I use last Mission planner version…

How to connect to HL2?

2

You may need to latest MP Beta to get HL working properly.

Using the MP beta, I can connect fine. No parameters though (by design).

What error messages are you getting?