Справочник Пользователя для Honeywell International Inc. KSN770
Draft
Page 3-47
6 Dec 2012
34-70-06
SYSTEM INSTALLATION MANUAL
066-01204 / 066-01213
© Honeywell International Inc. Do not copy without express permission of Honeywell.
Maximum differential input voltage:
21 volts
Maximum voltage to GND (each side):
13.5 volts
Input impedance:
420 kilohms
J2-48
AIRDATA REFERENCE HI
J2-67
AIRDATA REFERENCE LO
These pins always read the voltage used to excite an altimeter’s potentiometer. If no other source
in the aircraft is exciting the potentiometer, the KSN 7xx may be configured to excite the
potentiometer through these pins. If this is the case, the following apply:
in the aircraft is exciting the potentiometer, the KSN 7xx may be configured to excite the
potentiometer through these pins. If this is the case, the following apply:
AIRDATA REFERENCE HI is +9.0 volts referenced to AIRDATA REFERENCE LO.
Maximum differential input voltage:
21 volts
Maximum voltage to GND (each side):
13.5 volts
Input impedance:
420 kilohms
Minimum output load impedance:
2 kilohms
NOTE: Although current limiting is provided internal to the KSN 7xx, damage could occur if the
KSN 7xx is configured to excite the potentiometer at the same time another source is
exciting it. In addition, the analog airdata interface will not function properly in this case.
exciting it. In addition, the analog airdata interface will not function properly in this case.
C.
ARINC Serial Airdata Input
J2-46
BARO ALT 429 A
J2-65
BARO ALT 429 B
This input is for high speed ARINC 429. Low speed ARINC 429 must not be connected to this input.
If the airdata source broadcasts a label used by the KSN 7xx with the SSM set to failure warning,
then the ARINC 429 AIRDATA FAIL message will appear. An example of this is when the
BENDIX/KING KDC 481 airdata computer broadcasts TAS with the SSM set to failure warning
upon its determination that the temperature probe is not connected.
then the ARINC 429 AIRDATA FAIL message will appear. An example of this is when the
BENDIX/KING KDC 481 airdata computer broadcasts TAS with the SSM set to failure warning
upon its determination that the temperature probe is not connected.
A system may have many more labels than those listed. Selection of ARINC 429 or ARINC 419 is
done in the maintenance pages.
done in the maintenance pages.
All versions of the KSN 7xx accept the following ARINC 429 serial airdata labels as shown in Table
3-9.
3-9.
Table 3-9. ARINC 429 Serial Airdata Labels
429 Label
Parameter
203
Altitude (1013.25 mB)
204
Barometer corrected altitude #1
205
MACH (reserved for growth)
206
Computed airspeed
210
True airspeed
Draft as of 10/15/2012