Pinouts for button and LED light control connect to a low or high speed ARINC 429 transmitter board. Upper and Lower Display Unit controlled by a potentiometer.
ECAM Control Panel Pinouts
Canon plug B
Input Bus 1 (The DMC1 Controls illumination of the ECP Lights): G, H
Input Bus 2 (The DMC2 Controls Illumination of the ECP Lights): K, L
Output Bus 2 (The ECP triggers the change of system pages): E, F
Power: S (28 VDC), A (GND DC)
Bright CTL Upper DU: B (WIPER), C (LO), U (HI)
Canon plug A
Ground: V (connect to shared ground in Canon plug A, and to the ground ARINC 429 card)
Integral Lighting (5 VDC): X, W
Bright CTL Lower: DU B (WIPER), C (LO), U (HI)
Direct wiring to the ECP (bypass ARINC 429 method).