Install Manual Part 3

SKY497
Installation Manual
A-7
Rev. C
SIGNAL CHARACTERISTICS
Soft-keys (Continued) VOLTAGE Active: Min: 0.0 V
Max: 1.5 V
Inactive: Min: 3.5 V or Open
(Internal 4.7 kΩ pull-up)
Max: 5.0 V
Squat Switch Input This signal line is to be connected to the squat switch to sense when the
aircraft is on the ground (see para 2.6.12).
CONNECTION TRC P1-88 (SQUAT)
CABLE Minimum 22 AWG wire for lengths up to 30 ft.
VOLTAGE IN FLIGHT Indication
4.5 - 32 V dc or OPEN
ON THE GROUND Indication
Aircraft Ground
CURRENT <5 mA sourced.
Stepper Heading Input These connections will accept heading information from a King KCS55
(King KCS55) stepper drive unit (see para 2.6.4).
NOTE
Stepper heading input is selected via the Heading Input Source
jumpers P1-69 & P1-70 (see Table A on the Interconnect Wiring
Diagram, figures 2-2 and 2-3, sheet 2) located in the connector
back-shell.
Stepper Drive Motor 1 & 3
FREQUENCY Min: 0 Hz
Max: Turn Rate Dependent (.25 degree
increments per edge transition)
VOLTAGE Low Level: Min: 0 V
Max: 2 V
High Level: Min: 13 V
Max: 17 V
Max: 35 Vrms
INPUT IMPEDANCE >50 kΩ
CONNECTION P1-65 (DRIVE MOTOR 1) to KI-525 P2-A
P1-54 (DRIVE MOTOR 3) to KI-525 P2-H
CABLE See paragraph 2.6.4.
Stepper Drive Motor Unregulated +15 V
VOLTAGE Min: 13 V
Max: 17 V
INPUT IMPEDANCE >50 kΩ
CONNECTION P1-55 (UNREG +15) to KI-525 P1-V
CASE GND (AIRFRAME GROUND) to
KI-525 P1-J)
CABLE See paragraph 2.6.4.