SIDC (SID controls), 4D
The SID unit control panel communicates with the ICM on a wire and each button press or turn of the INFO knob is registered by the ICM. When turning the INFO knob in one direction, SIDC pin 1 will ground ICM pin 11, and when turning it in the other direction, SIDC pin 2 will ground ICM pin 12. The signal after pressing a button is sent from SIDC pin 4 to ICM pin 14. The signal is a 5 V, 960 Hz square wave (PWM), where the pulse ratio varies between 10% and 90%.
SIDC SPECIFICATION
| SIDC button | Pulse ratio (%) |
|---|---|
| - Extra equipment | 10 |
| ESP or TCS | 20 |
| Night Panel | 30 |
| Brightness control + | 40 |
| No button pressed | 50 |
| Brightness control - | 60 |
| CUSTOMIZE | 70 |
| CLEAR | 80 |
| INFO knob (press function) | 90 |