L-3 Communications SKYWATCH HP SKY899 Series Installation Manual page 130

SIGNAL
Heading Input
(XYZ Synchro)
Heading Input
(XYZ Synchro)
(Continued)
Heading Valid
Page A-6 - Appendix A
July 18, 2013
The document reference is online, please check the correspondence between the online documentation and the printed version.
SKY899
Installation Manual
CHARACTERISTICS
These connections from the aircraft heading source (ARINC 407 & 407-1
Synchro System Manual) allow the unit to rotate the displayed data as
the aircraft turns. See Heading Flag in this appendix for flag input
specifications.
X(S1), Y(S3), Z(S2)
FREQUENCY
VOLTAGE
INPUT IMPEDANCE
CONNECTION
CABLE
H and C (high and low reference - 400 Hz)
FREQUENCY
VOLTAGE
INPUT IMPEDANCE
CONNECTION
CABLE
Indicates that the heading source is providing valid heading information.
The status of the heading valid signal can be none, active low, or active
high and must be selected during system setup via the service menu.
CONNECTION
CABLE
VOLTAGE
INPUT IMPEDANCE
INPUT CURRENT
Min: 50 Hz
Max: 1500 Hz
Min: 5.0 V ac rms (w/reduced angular resolution.)
Max: 14.0 V ac rms (external padding required for
higher levels.)
>50 kΩ
Connector-Pin Signal Name
P1-46 HEADING_X
P1-47 HEADING_Y
P1-48 HEADING_Z
See paragraph 2.6.4.
Min: 320 Hz
Max: 480 Hz
Min: 3 V ac rms
Max: 35 V ac rms
>50 kΩ
Connector-Pin Signal Name
P1-49 HEADING_H
P1-50 HEADING_C
See paragraph 2.6.4.
Connector-Pin Signal Name
P1-51 HEADING_FLG
See paragraph 2.6.4.
None: Open or no connection
Active Low: (ref. to aircraft electrical ground)
Valid signal: -5 V dc to +2.5 V dc
Invalid signal: +9 V dc to +32 V dc
or open
Active High: (ref. to aircraft electrical ground)
Valid signal: +9 V dc to +32 V dc
Invalid signal: -5 V dc to +2.5 V dc
or open
>2 kΩ
Active: Min: 1 mA Max: 15 mA
009-11900-001
Revision F