BENDIX/KING
KAP 140
Page 4--10
Revision 2, Dec/2002
CS:15574F02.IDU
4.3.10 ENCODING ALTIMETER INTERFACE TO THE KC 140
PIN
DESCRIPTION
P1402 -- 3 C2
P1402 -- 5 C4
P1402 -- 11 A1
P1402 -- 13 A2
P1402 -- 14 A4
P1402 -- 16 BARO_SET
P1402 -- 20 B4
P1402 -- 21 C1
P1402 -- 29 D4
P1402 -- 33 B1
P1402 -- 34 B2
P1402 -- 36 BARO_REF_SUPPLY
The BARO_SET input from the encoding altimeter is supplied by a potentiometer connected to
the BARO_REF_SUPPLY output from the FCC. The value of the BARO_SET and
BARO_REF_SUPPLY can be viewed on the ANALOG VOLTAGE INPUTS diagnostic page. The
BARO_REF_SUPPLY voltage should be approximately 4 V. It can provide a maximum of 50mA
load current to the encoding altimeter.
DIAGNOSTIC NAME
SCALE FACTOR
BARO_SET 1V/V
BARO_SUPPLY_VOLTAGE 1V/V
D4 (MSB), A1, A2, A4, B1, B2, B4, C1, C2, and C4 (LSB) are the encoding altimeter gray scale
(Gillham) code representation of the current pressure reading. These inputs are displayed on the
DISCRETE INPUT STATUS diagnostic screen in hex notation, along with their equivalent altitude.
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