Dynon Avionics EFIS-D100 Installation Guide - Manual (Page 18)

Instrument Installation
3-6 EFIS-D100 Installation Guide
with the Dynon product(s). If your GPS is battery powered, and not normally connected to
aircraft ground, you must connect the ground pin on its serial output to a ground common to the
EFIS-D100.
When a Dynon product is connected to a GPS, it will synchronize its Zulu clock to the time
reported by the GPS. However, some GPSs, such as the Garmin 430 and 530, do not report time
in their serial output stream. Dynon products have no way to synchronize to these GPSs’ clocks.
Read the section below that corresponds to your configuration of Dynon products. All EFIS-
based product configurations direct you to connect your external device to PC serial receive (pin
22) on your Dynon EFIS product. You may make this connection at any point between pin 22 on
the EFIS DB25 and pin 3 on the connected DB9 EFIS/PC connector. If you purchased your
harness from Dynon Avionics, it may have a yellow/green wire provided for this purpose.
IF YOU OWN ONLY AN EFIS-D10A OR EFIS-D100
Connect the GPS or SL30 transmit line into pin 22 on the DB25 connector. This is the same
Serial Rx line that is used for firmware updates. You will need a way to disconnect this when
you plug your EFIS into a PC for firmware updates and checklists.
If you have both a GPS unit and an SL30, you will need to wire the two transmit lines to a 3-way
switch; connect the output of the switch into pin 22 on the EFIS harness. You will use this switch
to toggle between GPS, SL30 and a disconnected state. The HSI auto-detects the switched
instrument and will change modes automatically.
IF YOU OWN TWO EFIS-ONLY UNITS
When 2 EFIS-only units are connected via DSAB, only the DSAB Bus Master’s serial port is
active.
If you have only one serial device (GPS or SL30), connect its transmit line to pin 22 on the
DB25 connector of the EFIS that you have chosen to be the Bus Master. This is the same Serial
Rx line that is used for firmware updates. You will need a way to disconnect this when you plug
your EFIS into a PC for firmware updates and checklists.
If you have both a GPS unit and an SL30, you have two options:
 Wire the 2 devices’ transmit lines to a switch, allowing you to select the serial device active
on the HSI screen.
 Do not connect the two EFIS units together via DSAB. You may then wire one device to one
EFIS’ pin 22, and the other device to the other EFIS. Of course, the EFIS devices would be
independent and unable to share GPS or SL30 data.
You will need a way to disconnect both lines when you plug your EFIS into a PC for firmware
updates and checklists.
IF YOU OWN ONLY AN EMS-D10 OR EMS-D120
We recommend that you only connect a GPS to an EMS-only system; without the magnetic
heading from an EFIS, the HSI page will not be functional. Connect the GPS transmit line to pin
19 on the EMS DB37 connector. This connection will give you fuel endurance information