Dynon Avionics EFIS-D100 Installation Guide - Manual (Page 23)

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.
EFIS
DB25
pin# Function
Wire
color
4 DSAB-A Green
5 DSAB-B Blue
You must connect the DSAB A connection (pin 4) on the EFIS DB25 female harness to the
DSAB A connection for the next device in the chain. Do likewise for the DSAB B connection
(pin 5). 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 5-1 for detailed instructions on configuring
your DSAB network.
EFIS-D100 Installation Guide 3-11