Functional Pinout Descriptions - Honeywell KLN 90B Installation Manual

BENDIX/KING

2.3.6.2 Functional Pinout Descriptions

This section gives a brief description of some of the inputs and outputs of the
KLN 90B. It is provided so the installer can determine what specific wiring
needs to be done to the aircraft in which the unit is to be installed. Unless oth-
erwise specified, pins not used are to be left open.
A. Pin 1; GPS DISPLAYED
This pin is used as an input to tell the unit whether an external indicator is con-
nected to the analog OBS resolver inputs, in which case it will be high. This pin
will be grounded if an indicator is not connected or coupled to the unit.
B. Pin 2; TAKE HOME
Pin 2, when grounded, places the KLN 90B in Take-Home mode which is used
for trip planning only. It performs as if it is receiving adequate GPS signals to
determine its position. It displays the latitude and longitude of its last known po-
sition or of whatever position it is initialized to on the Setup Page. Pin 2 should
always be left open in the aircraft installation.
C. Pin 3; SDI 1/2
Pin 3 sets the Long-range Navigation System as primary or secondary. If the pin
is open, the ARINC 429 setup is for primary. If the pin is grounded, the ARINC
429 setup is for secondary. This pin is read each time the KLN 90B is turned on.
This pin is used only for dual long range navigation installations when a
KLN 90B is interfaced, through ARINC 429, as system #2.
D. Pins 4 and 5; EFIS 429 Receiver Inputs
The KLN 90B receives information from the Electronic Flight Instrument System
(EFIS) or KA 90 display adapter in GAMA 429 format on this input bus. This bus
should be left open if no EFIS or adapter is connected to the KLN 90B. For spe-
cific label information refer to
Paragraph 1.3.1
E. Pins 6 and 7; Radar Graphics 429 Receiver Inputs
The KLN 90B receives information from the Radar Graphics unit in GAMA 429
format on this input bus. This bus should be left open if no Radar Graphics unit
is connected to the KLN 90B. For specific label information refer to
1.3.1
F. Pins 8 and 9; Air Data 429 Receiver Inputs
The KLN 90B can receive information from the Air Data unit in GAMA 429 format
on this input bus. For specific label information refer to
tion 1 of this manual. If not used, these inputs must be connected to pins 23 and
24 respectively to eliminate unnecessary "air data fail" messages.
G. Pins 10, 11, and 12; OBI Data, Clock, and Sync
This is a three wire data bus that provides bearing to the active waypoint. The
data is in Honeywell format and can be used to drive certain Honeywell RMI
units. The output can also be converted by a Honeywell KDA 692 which pro-
vides standard 4-wire SINE/COSINE OBI information.
Page 2-4
in Section 1 of this manual.
in Section 1 of this manual.
10521I05.TDC
KLN 90B
Paragraph
Paragraph 1.3.1 in Sec-
Rev 5, April/2003