Advanced AF-6600 - 1.3 Avionics Data Buses

Version 16.10 AF-6600 AF-5000 Series Install Manual 12
1.3 Avionics Data Buses
Depending on the components you are planning to install in the aircraft you will need to wire two to five different avionics
data buses. The AF-6600 / AF-5000 has five RS-232 serial ports, a Dynon SV-Network connection and Ethernet
connection. If you are installing a GPS Navigator (IFD440,IFD540, IFD-550, GTN-650or GTN-750) you will need to use
an ARINC-429 to SV-Network converter so the EFIS can send and receive data from the Navigator. The Dynon SV-
ARINC-429 module or Advanced Control Module (ACM-ECB) is designed to interface to a Navigator’s ARINC-429 data
buses. The following is a brief description of each of the Data Buses and their uses:
Dynon Advanced SV-Network
The Dynon proprietary SV-Network is a parallel multidrop differential pair network with +8 volt power wires. The SV-
Network is designed to support up to 12 components using a 9-conductor cable with standard dsub 9 pin connectors.
The SV-Network was designed for redundancy and has two separate power, ground, and twisted pair data lines. The
spare 9
th
wire is used to provide power to the SV-EMS-220 module for a connected fuel flow transducer. Most of the
Dynon components connect to the SV-Network to talk to the EFIS screens.
RS-232 Serial Data
Many aviation components use a RS-232 serial connection to share data. A RS-232 connection has a single transmit
wire (labeled TX or TXD) and a single receive wire (labeled RX or RXD). RS-232 was really designed for only two
devices to share data between them. You can have a limited number of devices receive data from a single transmitter,
you should never have two transmitters on the same connection. One thing that seems to confuse people new to wiring
is you need to connect the TX wire on one component to the RX wire on the other component.
ARINC-429
ARINC-429 is a data transfer standard for aircraft avionics. The physical connection wires are on twisted pairs (Tx and
Rx are on separate ports). A single wire pair is limited to one transmitter and no more than 20 receivers. If you are
installing a certified NAV-COM-GPS (IFD-440, IFD540, IFD-550, GTN-650, GTN-750, GPS-175, GNS-430W) you will
need to wire ARINC-429 data connections. Just like RS-232 you need to connect the TX wires on one component to the
RX wires on the other component.