TN72 connected to Lite RS232 port 2 RX (V16 on RS232 port 1)
TT21 via Trig interface on CAN bus
EFIS configured for GPS: External NMEA 9600 and Transponder: Mode-S on CAN bus.
The system is partially working, but some anomalies to sort out that I can't find in the documenation-
- The transponder is not transmitting the entered ICAO ID Octal code.
The entered octal code is correct and confirmed retained through a power off/on cycle, but the code transmitted remains at some default setting.
Software issue? - The GPS position received by Airways is showing 'jumpbacks' of up to 500ft.
In trying to identify the problem, the pop-up GPS status viewer does not show any activity when NMEA is selected, making me suspicious we are not receiving/using external GPS data.
The serial port allocations for the Lite ports 1 and 2 do not list NMEA as an option- yet I am sure(?) I have seen that as a port 2 option on the Lite before?
Makes me suspicious that the Lite will not accept external GPS withut an extender to provide Port 6 fixed NMEA, and is defaulting to the internal GPS source?