Dynon Avionics EMS-D10 Installation Guide - Manual (Page 39)

Instrument Installation
Dynon Smart Avionics Bus (DSAB) Wiring
The Dynon Smart Avionics Bus is the only
way Dynon products can communicate with
one another, providing features such as data
sharing and alarm notification. DSAB is a
multi-drop bus, meaning several devices can
be connected to the same 2 wires. If you have
an EMS and EFIS product connected via their
serial ports through a null modem, you should
disconnect this legacy interface.
EMS
DB37
Pin#
Color Function EFIS
DB25
Pin#
34 Blue DSAB-B 5
35 Green DSAB-A
4
36 Blue DSAB-B
37 Green DSAB-A
You must connect the DSAB A connection
(pin 35 or 37) on the EMS DB37 harness to the DSAB A connection for the next device in the
chain. Do likewise for the DSAB B connection (pin 34 or 36). Some products – like the EFIS
series and the HS34 – have only one pair of DSAB connections on the back connector; other
products – like the EMS series – have two pairs, for wiring convenience. If you have 3 or more
devices in your system, and one of them is an EMS-series product, we recommend that you
locate it in the middle of your wiring scheme as shown below. This eliminates the need to splice
two wires together.
Wherever possible, ensure that the two DSAB wires (DSAB A and B) are run as a
twisted pair. This minimizes the system’s susceptibility to electrical noise.
Refer to the DSAB Configuration chapter on page 6-1 for detailed instructions on configuring
your DSAB network.
EMS-D10 Installation Guide 4-7