TruTrak Digitrak Install and User Guide - Manual (Page 13)

TruTrak flight systems DigiTrak Installation Manual
October 2009 11 8300-009 Rev B
Electrical Pin-out
The table below provides a brief explanation of each pin function on the main 15-pin connector P101.
1
9 10 11 12 13 14 15
2 3 4 5 6 7 8
P101
Pin
Function Notes
1 Autopilot Master (+12 to +14 V DC). The autopilot itself draws less than 0.3 ampere. Most of
the current required by the system is used by the servo (up to 1Amp depending on torque
setting) and a smaller amount (up to 180 mA) for the illuminated pushbuttons.
2 Control Wheel Switch. Connect as shown in wiring diagram to a SPST momentary switch
located remotely to the autopilot for convenient engage/disengage function.
3 Primary Serial Input. Baud rate selectable, normally 4800 or 9600 baud. Automatically
decodes NMEA-0183, Garmin Aviation Format, or Apollo/UPSAT Moving-Map format.
Provides directional reference to the autopilot.
4,5,6 Reserved. Do not connect to these pins.
7 Roll Servo Torque Control. A signal from the autopilot to the roll (aileron) servo which sets
the amount of torque to be delivered by the servo.
8 Ground Connection. Provide #20 AWG to common grounding point.
9 Power Connection to Servo. Provide #20 AWG to Servo Pin 1.
10 Instrument Lamp Dimmer. A source of variable DC from external dimming control module.
Drives the LED brightness control and three 60 mA lamps. If left disconnected, LED will be
full-on but buttons will be unilluminated.
Roll (aileron) Servo control lines. These lines cause the stepping motor in the roll servo to run
in the appropriate direction at the desired velocity. They are small-signal lines and do not have
any substantial current-carrying capability or require any special shielding. Connect to roll
servo as shown on wiring diagram.
Wiring to roll servo J201
J101 Pin 11 Pin 12
Direction of servo arm / capstan rotation
(as viewed from face of the servo body)
for RIGHT aileron
Standard J201-4 J201-5 Servo CCW (counter-clockwise) Î RIGHT
11
12
13
14
Reversed J201-5 J201-4 Servo CW (clockwise) Î RIGHT
Reverse servo direction if
necessary by swapping
wires on pin 11 and 12.
See note 3 on wiring
diagram also.
15 Ground Connection to Servo. Provide #20 AWG to Servo Pin 9.
Trouble Shooting
Problem Cause Corrective Action
No display No aircraft voltage Correct power, ground,
DT controller function but
no servo movement No aircraft voltage and /or torque
signal to servo Correct power & ground at servo.
Check @5 voltage at pin 6 at servo,
AP engaged
DT controller function but
servo just clicks Control wires (pin 2-5 at servo)
open or shorted to each other Correct wire short or servo wires
continuity
Commanded right turn
causes left turn Servo wire not installed correctly Swap wire at servo pins 4 and 5
check wires at 2 & 3 to controller
No GPS communication GPS not setup correctly or Baud
rate not set Setup GPS communication correctly
and match Bauds in both units.
Rear 15-Pin Connector P101
Viewed looking at wire side of connector