STD/Baro offset

Hi everyone

I am using opencockpit master cards with the ConfigIocard.exe software not SIOC. Can anybody help me with seting up a Standard button to set the altimeter to 29.92 and set up an encoder to adjust the pressure setting.

I have all the hardware in place and have set up other encoders so I know how to do this, but I need the offset that will set the 29.92. I have tried to use 0330 (FSX) which is the kollsman offset along with the QHN function in the software but this adjusts the setting to much (one turn of the encoder and I get pm sounds telling me "10000ft")

I can easly set a joystick button via fsuipc to set 29.92 but due to wiring arrangments I want to do this via the OC card.

Thanks

Douglas