Installation / Operation Manual
System Control Unit
16.03.2021 | V1.04
-13-
5.
Electrical Installation
The SCU Main Unit has seven connectors on the front side. Six of them are standard density D-Sub
connectors with 4-40 UNC threaded fastening. All three CAN Connectors
(“Lane A”, “Lane B” and “Lane
C
”)
are equipped with a filter adapter to enhance signal quality. Do not remove these filters. The
remaining DIN-style connector for the GNSS Antenna is secured with two safety wires.
Connector
Label
Connector Type
Usage
AUX
“AUX”
DA15S (female 15-pin D-Sub)
I/O
I/O
“EXT”
DB25S (female 25-pin D-Sub)
I/O
CANaero_A
“LANE
A”
DE9P (male 9-pin D-Sub)
CAN Bus Input, Power Supply
CANaero_B
“LANE
B”
DE9P (male 9-pin D-Sub)
CAN Bus Input
CANaero_C
“LANE C”
DE9P (male 9-pin D-Sub)
CAN Bus Output
FP
“PANEL OUT”
DE9S (female 9-pin D-Sub)
Connection to Extension Units
GNSS
“GPS INPUT”
Female Mini-DIN 6
GNSS Antenna
Table 5-1: Main Unit connectors
Place the GNSS antenna in a spot where it has maximum optical visibility of the sky, e.g. the glare shield
on top of the instrument panel. Poor GNSS reception has no adverse impact on the operation of the
unit yet may impair recordings of position, ground speed and UTC data.
Each of the extension units comes with two standard density D-Sub connectors with 4-40 UNC
threaded fastening on the rear of the display part. In case of the Front Panel, the ignition, auxiliary fuel
pump and battery backup power switches need to be connected using individual wires according to
the Installation Manual of the BRP Rotax engine.
Connector
Label
Connector Type
Usage
LED
“LED”
DE9P (female 9-pin D-Sub)
Annunciator Lights
Display
“SCU”
DE9S (male 9-pin D-Sub)
Connection to Main Unit
Table 5-2: Extension Unit connectors
Only use self-extinguishing cables suitable for installation in aircraft; e.g. SAE-AS22759 or SAE-
AS27500. AWG22 (0.34 mm²) is a sufficient cross section for power supply of the SCU. Preassembled
wiring harnesses are available as accessories for simplifying the installation. For part numbers see
Chapter 5.7 or contact RS Flight Systems directly.
Ensure that proper grounding connections are made and that the various ground potentials are not
connected outside of the Main Unit. This is especially important for the analog reference ground.
Figure 5-1 shows an overview of all standard connections.
Carefully check your wiring before powering up the unit for the first time.
