Dear Pete and Thomas,
Thank you for your helpful messages. To make myself clear:
-- when I run FSX-SE and then VRiSim, and then I select the default C172, the Radio Stack works perfectly, all buttons and dials.
-- however if I select A2A C172, almost none of the buttons do not work properly: COM1, COM2, NAV1 and NAV2 ON/OFF, DME R1 and R2 buttons do not work.
FSUIPC4 + VSPE are supposed to solve the problem (see Appendix 3 of their Advanced Documentation), so I bought them.
Now I followed your instructions:
run VSPE with pair COM4<=>COM5
Add lines to FSUIPC4.ini
[VRInsight]
1=COM3,COM4
run FSX, select default C172
run VRiSim, then Connect
However, in FSUIPC4 plugin, when I select tab "Buttons + Switches", only the bottom part of the radio stack respond:
-- none of the COM, NAV, ADF and DME panels button are recognized
-- the Transponder and Autopilot panels' buttons are "kind of" recognized by FSUIPC, but only when I push each button twice, both in FSUIPC plugin and back in the cockpit.
Then, I did not find the corresponding FSUIPC functions for buttons: "TRANSPONDER VFR", "TRANSPONDER NORM", "AUTOPILOT THR" nor "AUTOPILOT FD".
To recap:
(1) FSUIPC recognizes only the bottom 2 panels of the radio stack. Is it possible that there is other COMs that come in play? If so how to find out which COMs are involved and how to pair them in FSUIPC?
Maybe a hint: the VRInsight sofware "SFP2_COM_KeyMapper.exe" only displays these two bottom panels...
(2) For the two bottom panels (Transponder and Autopilot), FSUIPC only recognize events when I hit buttons twice (and same back in the cockpit). Is there any way FSUIPC could react at the first press of these buttons (just like for other joystick buttons?)
(3) There are a few functions missing in FSUIPC (even though without FSUIPC, on the default C172, they all work fine).
Best
--Max