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ADS-B FDL-978 Series and
Lite Series Installation Manual
Document No. 87343 Rev G
FFS Copyright © 2016 All rights reserved.
3-37
3.5.2.13.3 Display Output Settings
This section describes configuration settings for controlling traffic display output typically for
legacy displays.
3.5.2.13.3.1
“set max trgs” Command
This command sets the maximum number of targets to be sent on any configured serial or
ARINC 429 port configured for traffic display output. This is typically used to limit the number of
traffic targets for displays that can process a large number of traffic targets.
3.5.2.13.3.2
“set cheltonCSA” Command
This command enables/disables the (Conflict Situational Awareness) CSA bit in the Heartbeat
message of the “Traffic-Alert” protocol. This parameter defaults to “disable” and should ONLY
be set to “enable” when interfacing to a Chelton FlightLogic Display. The Chelton display is not
TSO-C195a compliant and requires this Heartbeat message bit to be set or it will generate an
ADS-B failure. The FDL-978-XVR does not implement a Conflict Situation Awareness (CSA)
algorithm since DO-217A and TSO-C195a do not currently specify any CSA applications. For all
other displays leave this parameter at the default setting of “disable.”
The FDL-978-XVR does not implement a CSA algorithm since DO-217A and TSO-
C195a do not currently specify any CSA applications.
3.5.2.13.3.3
“set trafVelVal” Command
This command enables/disables the DO-317A/TSO-C195A Traffic Velocity
Validation\Invalidation of legacy ADS-B Transmitters that transmit NACv values of 0. This
parameter defaults to “enable” and should ONLY be set to “disable” when interfacing to legacy
displays that are 1) not TSO-C195a compliant and 2) do not adequately display non-directional
traffic symbols. Several non-TSO-C195a displays adequately display non-directional traffic and
do not require velocity validation/invalidation to be disabled.
The FDL-978 Series attempts to validate NACv=0 velocities per DO-317A/TSO-C195a but
some traffic states (low-speed ground) will still cause the NACv=0 track velocities to be
invalidated and sent to the display as non-directional traffic. Setting this parameter to “disable”
turns off all DO-317A/TSO-C195a velocity validation/invalidation and passes the track’s velocity
data to the display as directional traffic. This parameter should only be set to “disable” for legacy
non-TSO-C195a displays without non-directional traffic symbols when occasional display of
non-directional traffic is deemed to be unacceptable or misleading. Otherwise leave this
parameter at the default setting of “enable.”