Transponder Modes and IDENT command readable by 3rd parties

For MFS to further support hardcore simmers flying on online flight networks (eg. PilotEdge), we need MFS to make the Transponder Modes (ie. OFF/ON/STBY/ALT) and the Transponder ‘IDENT’ command readable by third-party network clients (running in the background).

Currently, simmers need to switch between MFS and external client windows during (critical phases of) flight to change the transponder mode and/or to IDENT to ATC. This greatly interrupts the immersion and effectiveness of doing advanced simming in MFS. Moreover, in MFS VR, this current limitation is worse, since switching to external windows requires snapping in and out of VR …

We LOVE the latest implementation of the ‘dual comms monitor’ feature in SU2 as wished by the community. The above-described wish would make MFS fully compatible (and thus truly practical to use) with online flight training networks, such as PilotEdge.

Please allow third-party apps to read our Transponder Modes and IDENT commands in SU3. Thank you for all the great and hard work so far!

Agreed. Voted

This would be huge!

Agreed and voted.

I guess that this would be a simple thing to add to the sim?

Yup! That, and monitoring COM2. It’s not a sim until it has the basics working…and this is basic.


Def needed , hopefully it’s an easy fix.

Note that the transponder mode is available via the TRANSPONDER STATE simvar. I have not yet found a way to detect when the user presses the ident button through SimConnect. Once I have that figured out, I will add support to vPilot and the PE client.


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Hi Ross, to confirm - am I correct in thinking Transponder State still isn’t supported by vPilot? new to Vatsim this week and noticed the TBM transponder controls weren’t sticking me in mode C, I’ve seen all the historical posts about the lack of FS > vpilot communication on this front, is this still work in progress?


That’s correct, the TRANSPONDER STATE simvar is not yet read by vPilot. I’m waiting to hear back from Asobo about how to detect (through SimConnect) when the user presses the ident button. At that point, I will add support for both the transponder state and the ident button.

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