Note: The SV-XPNDR-261/262 power input is not protected against reversed
power connections. If the power and ground inputs to the SV-XPNDR-261/262 are
reversed, and power is applied to the Ground input, and Ground is applied to the
Power input, the SV-XPNDR-261/262 will be destroyed and this repair will not be
covered under warranty. Check wiring before applying power!
Pin 1/2 and 12/13 Loopbacks
Pins 1 and 2 must be connected together (as shown in Figure 131, Figure 132, and Figure 133
above. Pins 12 and 13 must be connected together (as shown in Figure 131, Figure 132, and
Figure 133 above.
Serial RX (Pin 5) and Serial TX (Pin 7)
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 SV-XPNDR-261/262’s 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 SV-XPNDR-261/262’s 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 SV-XPNDR-261/262.
Mutual Suppression (Pin 18) (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 SkyView-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.
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