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Help with FSUIPC and PMDG 737NGX Offset readings

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Hi everyone

I'm sorry if this questions has been asked before. I have looked around for similar problems, but I can't seems to find any fix for mine

My problem is simple, I'm trying to read the CMD A annunciator of PMDG 737 NGX on P3D v4. From my understanding, I would need to read offset 0x6545 to do this, so here's my simple lua script that i made to do so

arduino = com.open("COM3", 9600, 0)

while 1 do
    cmd_a = ipc.readUB(0x6545)

The problem is, I can't seem to get any value (the value in ipc display is always 0, regardless if the button (CMD A) is lit up or not). Would be great if someone could point out the mistakes/ misunderstandings I've made here

What I've done:

I have added the line to enable data broadcast for PMDG in '737NGX_Options.ini' file

I know that the LUA file is running as the ipc display is displaying number on top of the screen

Background Information:

I'm running on P3D v4, using latest version of FSUIPC (5.121b). I'm trying to build the MCP eventually. In doing so, I'm using and arduino card, and uses serial communication.


Any help would be greatly appreciated. If further clarification is needed, please ask me.



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Is FSUIPC getting the 737NGX data?  Check something more obvious, such as the Flight Number string at offset 6614. Read that via ipc.readSTR. If that and other data is ok, then the Annunciator indications problem becomes a question for PMDG.

There are parameters in the FSUIPC5.INI file to enable/disable the various PMDG offset reading. Check that this is not set to disable them.  They should be enabled by default -- either

PMDG737offsets=Auto or PMDG737offsets=Yes



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