HS34 Pinout

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The HS34 has two D25 connectors on it. The upper one is male on the HS34 and is power, DSAB, etc. The lower one is female on the HS34 and is the ARINC and analog resolver interface.

Upper D25, male on HS34, female connector on harness

  • Pin 1: Serial 1 RX (PC updates & second serial port)
  • Pin 2: Serial 2 RX (SL30, GPS, etc)
  • Pin 3: DSAB A
  • Pin 4: + In (10-30V, 250 mA maximum draw at 12V)
  • Pin 5: GP Output 1 (Same as EMS Warning Light output, not currently supported)
  • Pin 6: GP Output 2 (Same as EMS Warning Light output, not currently supported)
  • Pin 7: GP 1 in (same as EMS GP in)
  • Pin 8: GP 2 in (same as EMS GP in)
  • Pin 9:+5V out
  • Pin 10: GP 6 in (+15V GP in, not currently supported)
  • Pin 11: GP 5 in (+15V GP in, not currently supported)
  • Pin 12: GP 4 in (same as EMS GP in)
  • Pin 13: GP 3 in (same as EMS GP in)
  • Pin 14: Serial 1 TX
  • Pin 15: Serial 2 TX
  • Pin 16: DSAB B
  • Pin 17: Ground
  • Pin 18: Contact input 4 (same as EMS contacts output)
  • Pin 19: Contact input 3 (same as EMS contacts output)
  • Pin 20: Contact input 2 (same as EMS contacts output)
  • Pin 21: Contact input 1 (same as EMS contacts output)
  • Pin 22: Marker Outer Input
  • Pin 23: Marker Middle Input
  • Pin 24: Marker Inner Input
  • Pin 25: Voice audio output (8V P-P, you'll probably need an external attenuator)

Lower D25, female on HS34, male connector on harness

  • Pin 1: CDI + when deflected right
  • Pin 2: VOR + when TO flag shown
  • Pin 3: LOC +
  • Pin 4: GS + when up UP
  • Pin 5: GS + when FLAG shown
  • Pin 6: DME Analog IN (0-8V, 40mv/NM)
  • Pin 7: Resolver E
  • Pin 8: Resolver D
  • Pin 9: Resolver F
  • Pin 10: ARINC 429 RX 2 B
  • Pin 11: ARINC 429 RX 1 B
  • Pin 12: ARINC 429 TX B
  • Pin 13: ARINC 429 TX B
  • Pin 14: CDI + when Left
  • Pin 15: VOR + when From flag shown
  • Pin 16: LOC -
  • Pin 17: GS + when Down
  • Pin 18: GS + when Flag hidden
  • Pin 19: Resolver A
  • Pin 20: Resolver C
  • Pin 21: Resolver E
  • Pin 22: ARINC 429 RX 2 A
  • Pin 23: ARINC 429 RX 1 A
  • Pin 24: ARINC 429 TX A
  • Pin 25: ARINC 429 TX A