Installation Guide Manual

EFIS-D10 Installation Manual
EFIS-D10 Installation Guide Doc Num: 100006-000 Rev. C
9/11/2003 Page 10 of 24
Power Harness Wiring
The EFIS-D10 has three separate power inputs. Of the three, only Master Power is required to
operate the unit. The other two inputs provide additional redundancy. Below is a table that
explains the three inputs and their purposes. All three of these inputs share a common ground
signal, wired to pin 3 on the DB-25 connector.
Master Power Provides primary power to the instrument. The EFIS-D10 will
switch on upon application of Master Power.
External Backup Power Will operate the EFIS-D10 only if Master Power is lost. The
transition from losing Master Power to running off External
Backup Power will bring up a Power off warning, requiring the
user to press a button within 30 seconds to acknowledge this. This
warning will also display when transitioning from either Master
or External Backup to Internal Battery power.
Keep Alive Power A very low current power input which is only used if both Master
and External Backup Power are not applied. Keep Alive draws
just enough current to keep the clock running and keep the battery
charged. It draws less than 1 milliamp of current when not
charging the internal battery.
Altitude Encoder Wiring
The EFIS-D10 outputs its altitude measurements in standard gray code and is readable by most
transponders. The EFIS-D10 will function properly whether or not this altitude encoder
functionality is utilized. To use the EFIS-D10’s altitude encoder functionality, simply wire the
11 encoder signals from the DB-25 connector to their respective connections on your Mode-C
transponder. Many transponders do not use the Strobe signal; in these cases, simply wire the
ENCDR-STROBE signal to ground.
The gray code output of the EFIS-D10 reports altitude not adjusted for barometric pressure.
There is no way to alter the output of the encoder.