Dynon Avionics EMS-D120 Installation Guide - Manual (Page 37)

Instrument Installation
Do not connect any serial devices to the secondary EFIS device. It will only display data from
the serial devices connected to the master FlightDEK-D180.
External EMS Warning Light
EMS DB37 Pin 29 can be wired and configured
as an external warning light, or alternatively, to
automatically control cabin light levels in sync
with the screen brightness of the Dynon
instruments.
EMS
DB37
Pin
Color
To wire EMS DB37 Pin 29 as an external
warning light, you may connect any standard
LED or incandescent lamp (1.5 watts maximum),
used during EMS-related alarm conditions.
Ensure that the LED or lamp is designed for the voltage of your system. Mount it to your panel
according to its recommendations. Connect one of the lamp’s leads to your plane’s power.
Connect the other lead to pin 29 on the EMS-D120 37-pin wiring harness. During an alarm
condition, this pin is connected to ground, causing current to flow through the lamp.
Function
29 Yellow/Green
External
warning light
/ Dimmer
control
To configure EMS DB37 Pin 29 as an external warning light, enter the EMS menu by pressing
any button beneath an EMS main page. Press MORE > SETUP > GLOBAL. Press DOWN▼ to
select ALARM CONFIG and press SEL. LGT BHVR: ACK SOLID configures the external
alarm light to remain on (solid) when the alarm condition is acknowledged. LGT BHVR: ACK
CLEAR configures the external alarm light to go off when the alarm condition is acknowledged.
Verify correct operation of the external EMS warning by using the test function in the GLOBAL
menu. Enter the EMS menu by pressing any button beneath an EMS main page. Press MORE >
SETUP > GLOBAL. Press DOWN▼ to select ALARM CONFIG and press SEL. Select TEST
ALARM LIGHT and follow the instructions to test external light functionality.
Dimmer mode function is generally used only by Original Equipment Manufacturers (OEMs). In
dimmer mode, the output of EMS DB37 Pin 29 is a Pulse Width Modulation (PWM) signal
proportional to the screen brightness setting of the Dynon instruments. To configure EMS DB37
Pin 29 for dimmer mode, enter the EMS menu by pressing any button beneath an EMS main
page. Press MORE > SETUP > GLOBAL. Press DOWN▼ to select ALARM CONFIG and
select LGT BHVR: DIM OUTPT.
EMS-D120 Installation Guide 4-5