EFIS-D100 Installation Guide - Dynon Avionics

Instrument Installation
The metal shield around the EDC communication cable is connected to the short black/white
wire emanating from the DB25. Connect this wire to ground.
Power Inputs
The EFIS-D100 has three separate power inputs, located on the DB25 EFIS connector. Of the
three, only Master Power is required to operate the instrument. The other two inputs provide
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 EFIS connector.
EFIS Function
DB25
pin#
1 Master
Power
2 Keep Alive
Power
3 Master
Ground
15 External
Backup
Power
EFIS DB25 wire
color
Red
Yellow
Black
(Not wired in
Dynon harness)
Description
Provides primary power to the instrument.
The EFIS-D100 will switch on upon
application of power. Connect to a switched
power source. Will not be adversely affected
by engine cranking.
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. It
draws less than 1 milliamp of current when
not charging the internal backup battery.
Dynon Avionics recommends not connecting
the Keep Alive wire when the EFIS-D100 has
an internal battery installed or is connected to
a GPS. Keep Alive is only used in
installations with no battery or GPS to keep
the clock running when the unit is powered
off.
Connect to ground. Must carry as much as 3
amps.
Will operate the EFIS-D100 only if Master
Power is not present. The transition from
Master Power to External Backup Power will
bring up a warning, requiring you to press
ACK within 30 seconds to keep the unit
operating. This warning will also display
when transitioning from either Master or
External Backup to Internal Battery power.
EFIS-D100 Installation Guide 3-3