GPS 155XL/GNC 300XL Installation Manual
P/N 190-00067-22 Rev E Page 2-5
2.7
EXTERNAL ALTITUDE INPUT
Pressure altitude input from an external source may be derived from a RS-232 compatible serial altitude input or
Parallel Gray Code/Gillham Altitude as described in Section 4 of this manual. Gillham Altitude is not required when
serial altitude is used.
Figure 2-2. Switch/Annunciator Layout
