HDP20 pin assignment

Connect A (forward)

Taxi lights

• 3 size 16 pins, pos, neg, shld

IBBS battery (shared with B connector)

• 1 size 16 pin (13A rating) - main aircraft bus (3 20AWG wires from DB15 wires condensed into 1 pin)
• 1 size 16 pin (13A rating) - gnd (3 20AWG wires from DB15 wires condensed into 1 pin)
• 4 size 20 pins, charge/sense, low voltage warning LED, batt info volt meter, backup power master

Tail ADS B-In

• 2 size 20 pins, serial rx, serial tx

Transponder

• 2 size 20 pins, serial rx, serial tx

Tail ADS B-in/ Transponder

• 2 size 20 pins, pwr, gnd

Stick

• 5 size 20 pins, lh trim up, lh trim down, rh tirm up, rh trim down, stick gnd (omit AP disconnect)

Servos

• 6 size 20 pins, net 1a, net 1b, net 2a, net 2b, pos, neg

Overhead lights

• 3 size 20 pins, white gnd, red gnd, pos

Trim

• 2 size 20 pins, red, green

Left wing OAT

• 3 size 20 pins, signal, pwr, gnd

Magnetos

• 3 size 20 pins, left, right, common shield

Start contactor

• 1 size 20 pin

Master contactor

• 1 size 20 pin

Wing OAT

• 2 size 20 pins

A subtotal

34 size 20, 5 size 16

Connect B (aft)

IBBS battery

• 1 size 16 pin (13A rating) - backup power output (4 20AWG wires from DB15 condensed into 1 pin)

Landing lights

• 4 size 16 pins, lh pos, rh pos, neg, shld

Nav/strobe lights

• 4 size 20 pins, nav pos, strb pos, neg, shld

GPS2020

• 4 size 20 pins, plus8v, gnd, serial rx, serial tx

USB

• 3 size 20 pins, pos, neg, shld

Flarm fusion

• 4 size 20 pins, serial rx, serial tx, pwr, gnd

COM radio

• 5 size 20 pins, gnd, pwr, enable, data rx, data tx

ELT beacon

• 5 size 20 pins, gnd, shld, elt rx, rmt sw, ext on

Flap control

• 5 size 20 pins, pos, gnd, flap up, flap down, airspeed

Intercom

• 6 size 20 pins, audio left, audio right, audio gnd, dim, pwr, gnd

B subtotal

35 size 20, 5 size 16

64 size 20 pins in all, 84 available

Several size 20 pin locations used to create keying (5 pins on each connector, losing 10 connections in all)

9 size 16 pins, 10 available

Size 16 pins no longer used for keying