Installation Guide User Manual
Instrument Installation     
PC USB CONNECTION 
If you do not have a serial port on your PC, you may use a USB-to-Serial adapter to connect the 
EMS-D120 to your PC’s USB port. You may purchase an adapter from us, Radio Shack, or 
many computer stores. If you are using Windows 2000 or XP, ensure that the adapter driver CD 
is inserted in your PC before plugging the adapter into the USB port for the first time. If you are 
using Windows Vista, ensure that you are connected to the Internet and do not use the driver 
CD; the operating system will download the correct driver. Also, do not have your EMS-D120 
plugged into the USB-to-Serial adapter while installing the driver. 
EMS SERIAL HARNESS 
On the EMS 37-pin wiring harness available 
from Dynon, there are three wires bundled 
together, colored orange, yellow, and black, and 
terminating in a standard D-sub 9-pin female 
connector. If you did not purchase a harness 
from Dynon, obtain a 9-pin D-sub connector 
and make the three connections shown in the 
table. 
EMS 
DB37 
Pin# 
DB9 
Pin#
Color  Function 
4-2 EMS-D120 Installation Guide 
To verify proper communication between the 
EMS-D120 and the PC, use the Dynon Avionics 
Product Support Program’s “Detect Firmware Version” function. Download the latest version of 
the Support Program from the Dynon Web Site at downloads.dynonavionics.com. 
SL30 and/or GPS connection 
Depending on the number and types of Dynon units you own, 
you have several options for connecting a GPS unit and/or 
Garmin/Apollo SL30 to your Dynon system. The GPS can be 
used as a data source for the EFIS, HSI, and Fuel pages, as 
well as Dynon’s EFIS-based Autopilot. The SL30 can be 
used as a VOR, localizer, or ILS (localizer + glideslope) 
source for the HSI. If you wish to connect a GPS and/or 
SL30 to your Dynon system, read the section below which 
corresponds to your set of Dynon products. 
  If your system has an HS34, it is required that all 
GPS and NAV devices are connected to the HS34. 
The EMS-D120 does not support directly connected 
GPS and NAV devices when an HS34 is installed in 
the system. Refer to the HS34 Installation and 
Configuration section in your EFIS-based product’s 
Installation Guide for device connection details. 
11 2 Orange 
EMS transmit / 
device receive 
12 3 Yellow 
EMS receive / 
device transmit 
30 5 Black RS232 Ground 
GPS units known to work 
AvMap EKP-IV (v2.06.116R, 
NMEA set to “processed”) 
Bendix/King Skymap (set to 
AR NAV 9600 output) 
Garmin 
96, 96c, 150XL, 195, 196, 295, 
296, 396, 400*, 420*, 430*, 
430W*, 496, 500*, 520*, 
530*, 530W*, GX60, GX65 
Lowrance handhelds 
* Do not output time over 
serial; ARINC connection via 
HS34 required to receive time.
A frequently updated list of 
compatible GPS units and 
settings is available at our 
Documentation Wiki at 
wiki.dynonavionics.com
. 










