Honeywell BENDIX/KING KAP 140 Maintenance Manual page 81

to the directional gyro. They are capable of supplying 30mA of current. The CRS_DATUM input
(used for heading datum and course datum) is an analog input that can be viewed through the
diagnostic pages.
DIAGNOSTIC NAME
Course Datum
4.3.7 HORIZONTAL SITUATION INDICATOR (HSI) INTERFACE TO THE KC 140
PIN
P1401 -- 2
P1401 -- 11
P1401 -- 27
P1402 -- 17
If an HSI is used with the KAP 140 autopilot system , four wires interface to the KC 140. They are
the DG_VALID input, HDG_DATUM input, CRS_DATUM input, and CRS_HDG_REF input. The
DG_VALID is a Open/Ground discrete input signal provided by the HSI to inform the KC 140 when
the information being received is valid. The DG_VALID status (Ground = Valid) can be viewed on
the DISCRETE INPUT STRAPS/VALIDS diagnostic page. The HDG_DATUM and CRS_DATUM
inputs are analog inputs that can be viewed through on the ANALOG INPUTS diagnostic page.
DIAGNOSTIC NAME
Heading Datum
Course Datum
Revision 2, Dec/2002
CS:15574F02.IDU
BENDIX/KING
KAP 140
SCALE FACTOR
210 mV/deg
DESCRIPTION
HDG_DATUM_+
DG_VALID
CRS_HDG_REF
CRS_DATUM_+
SCALE FACTOR
550 mV/deg
210 mV/deg
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