Honeywell International Inc. KSN770 Manual De Usuario
Draft
Page 3-46
6 Dec 2012
34-70-06
SYSTEM INSTALLATION MANUAL
066-01204 / 066-01213
© Honeywell International Inc. Do not copy without express permission of Honeywell.
3.9.4
Electrical Characteristics
A.
Gillham Altitude
Gillham Altitude Input
J2-13
D4
J2-34
A1
J2-35
A2
J2-49
A4
J2-17
B1
J2-54
B2
J2-53
B4
J2-45
C1
J2-18
C2
J2-31
C4
These inputs are active low, and conform to the requirements of ARINC 575-3, Attachment 5.
NOTE: Some receivers of the altitude encoder do not have internal isolation diodes to prevent the
unit from pulling the encoder lines to GND when the unit is OFF. The KSN 7xx has diodes
internal to the unit. However, some transponders and other devices do not have the
internal diodes. These units require a diode to be added to the installation harness for
every encoder line. The diodes are inserted at the connection to the unit that does not
have internal diodes. The anode is on the receiving unit’s side and the cathode is on the
encoder side. A set of diodes is required for each unit without internal diodes.
internal to the unit. However, some transponders and other devices do not have the
internal diodes. These units require a diode to be added to the installation harness for
every encoder line. The diodes are inserted at the connection to the unit that does not
have internal diodes. The anode is on the receiving unit’s side and the cathode is on the
encoder side. A set of diodes is required for each unit without internal diodes.
B.
Analog Baro Correction
J2-8
BARO CORRECTION HI
J2-28
BARO CORRECTION LO
These pins are configured on the maintenance pages for input of either DC altitude or DC
barometric correction. This is an altimeter potentiometer voltage. The most positive lead of the
potentiometer must be connected to BARO CORRECTION HI (i.e. if the potentiometer is excited
with a negative voltage, the lead with the negative voltage must be connected to BARO
CORRECTION LO).
barometric correction. This is an altimeter potentiometer voltage. The most positive lead of the
potentiometer must be connected to BARO CORRECTION HI (i.e. if the potentiometer is excited
with a negative voltage, the lead with the negative voltage must be connected to BARO
CORRECTION LO).
If the BARO CORRECTION inputs are used for baro correction, the maintenance page must be
configured properly. Some altimeters output a baro correction voltage that is linear with inches of
mercury barometric pressure. Others output a voltage that is linear with the altitude correction
between pressure altitude and indicated altitude. Refer the installation manual for the piece of
equipment being connected for more information.
configured properly. Some altimeters output a baro correction voltage that is linear with inches of
mercury barometric pressure. Others output a voltage that is linear with the altitude correction
between pressure altitude and indicated altitude. Refer the installation manual for the piece of
equipment being connected for more information.
HI:
A voltage of not less than 10.0 volts relative to AC GND or a
resistance to AC GND of not less than 100 kilohms.
resistance to AC GND of not less than 100 kilohms.
LO:
A voltage of not more than 1.9 volts relative to AC GND or a
resistance to AC GND of not more than 375 ohms.
resistance to AC GND of not more than 375 ohms.
Draft as of 10/15/2012