Dynon Avionics SkyView System Installation Guide - Manual (Page 230)

SV-XPNDR-261/262 Installation, Configuration, and Testing
11-10 SkyView System Installation Guide - Revision S
Note: The transponder power input is not protected against reversed power
connections. Reversing the power and ground inputs to the transponder will
destroy it. Check wiring before applying power.
Pin 1/2 and 12/13 Loopbacks
Pins 1/2 and pins 12/13 must be connected to each other as depicted in the figures above.
Serial RX/TX
All communication between the SV-XPNDR-261/262 module and SkyView is accomplished via a
single bidirectional serial connection. To accomplish this:

Choose an unused serial port on each display to connect the SV-XPNDR-261/262. Note
that both the TX and RX sides of the serial port are needed and both the RX and TX lines
must be connected to all displays in parallel. It is required that the same numerical serial
port on each display be used.

Connect the SV-XPNDR-261/262 TX wire (pin 7) to the SkyView serial RX of your
choosing. If you have multiple displays, the transponder TX wire must be connected to a
serial RX wire on each display.

Connect the SV-XPNDR-261/262 RX wire (pin 5) to the SkyView serial TX of your
choosing. If you have multiple displays, the transponder RX wire must be connected to a
serial TX wire on each display.

Record the SkyView serial port that you have chosen on each display as you will need to
configure it later for use with the transponder.
Mutual Suppression (optional)
Mutual Suppression allows two or more transmitters on adjacent frequencies to inhibit the
other transmitters when one is active to limit the interference effects. It is commonly used
between transponders and DME systems, and between transponders and collision avoidance
systems. Most installations will not make use of this feature, since most Dynon-equipped
aircraft have only one transponder and often do not have DME equipment or other active
traffic system that interrogate other aircraft.
The Mutual Suppression pin (18) is an ARINC compatible suppression bus interface, which acts
as both an input and an output. The SV-XPNDR-261/262 will assert this signal when it is
transmitting, and can be suppressed by other equipment that asserts the signal. The SV-
XPNDR-261/262 will drive approximately 24 Volts on the output (independently of supply
voltage), and will treat the input as active whenever the bus has greater than 10 Volts.
If you are using the Mutual Suppression feature, simply connect all of the Mutual Suppression
wires from devices that use them together.