SV-EMS-220 Installation and Configuration
SkyView System Installation Guide - Revision K 7-41
Route either of the two wires to an electrical ground. Route the other wire to the general
purpose input of your choice.
Rotax CHT Sensors
The Rotax CHT sensors may be connected to any general purpose input pin on the SV-EMS-220’s
D37, however, we recommend that they be connected to pins 4 and 22 for left and right signals,
respectively.
Crimp bare ¼” female Faston terminals (6.3x0.8 according to DIN 46247) onto the ends of two
general purpose input wires on the EMS 37-pin Main Sensor Harness. Locate the left-side CHT
sensor screwed into the bottom side cylinder head 2; slide the Faston connected to one of the
general purpose inputs onto it. Locate the left-side CHT sensor screwed into the bottom side of
cylinder head 3; slide the Faston connected to the other general purpose input onto it.
Trim and Flaps Position Potentiometers
Position potentiometers may be connected to any general purpose input pin on the SV-EMS-
220’s D37 and must be calibrated according to the instructions found in the EMS Sensor
Calibration Section. The number of position potentiometers in any installation is limited by the
number of unused general purpose input pins on the SV-EMS-220’s D37 connector. The tables
in the Example Engine Sensor and Transducer Installations Section contains recommended
input pins for position potentiometers.
Dynon Avionics does not sell trim or flaps position sensors. These are normally included with, or
added onto, their respective servos.
Most flap and trim sensors are potentiometers (variable resistors) which require power and
ground inputs, and supply an output that is a function of position. These potentiometers come
in a variety of resistance ranges, but are typically 1 kΩ, 5 kΩ, 10 kΩ, and 20 kΩ. All of these
values will work properly with the SkyView, as there is a calibration required. Connect the +5
volt Auxiliary pin from the SV-EMS-220’s D37 to the +5 volt input on your trim/flap position
sensor. Note that you may need access to the SV-EMS-220’s +5 volt auxiliary supply for other
sensor installations, so make allowances for breaking out the connection to other areas.
Connect the ground input on the sensor to a ground common to the SV-EMS-220’s signal
ground. Connect the output of the sensor to the desired general purpose input. For physical
installation, refer to the instructions that came with your position sensor.
If you are using the output from a Ray Allen servo or sensor, connect its white/orange wire to
the SV-EMS-220’s +5 volt Auxiliary pin (D37, pin 18), its white/blue wire to ground, and its
white/green wire to the general purpose input of choice. Note that you may need access to the
SV-EMS-220’s +5 volt auxiliary supply for other sensor installations, so make allowances for
breaking out the connection to other areas.
Trim and flaps position potentiometers must be calibrated. Your SkyView display
utilizes onscreen wizards that help you do this. Go to the EMS Calibration Menu to
access these wizards (SETUP MENU > HARDWARE CALIBRATION > EMS
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