SV-EMS-220/221 Installation and Configuration
SkyView System Installation Guide - Revision AA 7-13
Table 28 – Dynon Avionics EMS Wire Harnesses
A typical SV-EMS-220 installation will utilize one EMS 37-pin Main Sensor Harness and one of
thermocouple wire harness. A typical SV-EMS-221 installation does not utilize a thermocouple
harness. Choose a thermocouple wire harness based on the number of EGTs and/or CHTs that
need to be monitored.
The EMS 37-pin Main Sensor Harness includes a 9-pin connector that is wired to
pins 11 (Orange wire), 12 (Yellow wire), and 30 (Black wire). This connector is
used for other Dynon Avionics products, but is not used in SkyView installations.
Thus, the 9-pin connector should be removed to use these wires for connecting
sensors to the SV-EMS-220. Remove the connector by cutting the three wires
close to the 9-pin connector.
The EMS 37-pin Main Sensor Harness (Dynon Avionics P/N 100399-000) may be
wired with blue and green wires on pins 36 and 37, respectively. If you are going
to use pins 36 and 37 for a thermocouple input such as a CHT or EGT (this is not
possible on the SV-EMS-221 that is used with the Rotax 912 iS, as these wires are
reserved for CAN communications), the blue and green wires should be removed
and replaced with the appropriate type of thermocouple wire for thermocouple
functionality on pins 36 and 37. If you are not going to use these pins for a
thermocouple input, the blue and green wires do not need to be removed.
All of the ground wires on the SV-EMS-220/221 D37 are interchangeable, and can
be used for any sensor that requires grounding. Additionally, one of these wires
needs to be grounded to the aircraft locally to provide a good ground reference
for the engine sensors. We suggest using the black ground wire connected to D37
pin 3 for this purpose.
Sensor and Transducer Compatibility Key
This section is primarily intended for users with installations that are not
supported in or significantly deviate from the preconfigured installation resources
available from Dynon Avionics. Reference Example Engine Sensor and Transducer
Installations Section for installations which have downloadable preconfigured
installation resources.
This section explains how to use Table 29 – Sensor and Transducer Compatibility Level Key.
There are three compatibility designations: A, B, and C. These designations are explained in the
following paragraphs.
Sensor and transducer compatibility level A denotes that an SV-EMS-220/221 D37 pin labeled
as “A” in Table 30 can be configured to support the vast majority of sensors and transducers
used in aircraft installations, which are primarily resistive in nature. Sensors and transducers
include contacts, fuel level, fluid pressure, fluid temperature, temperature, and position
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