For the ARINC module, Drawing 53620WD (ARINC Adapter dwg) states 'Serial #1 GND Pin - NOT REQUIRED' (G430W connection). EFIS dwg 53600 shows this ground connected.....which is correct? How about for Serial 2 and Serial 3....are grounds required for those?
And for the Magnetometer? Is a ground required for this?
Thanks