SID control panel (737): Connection

CONNECTOR PINOUTS REFERENCE

Pin no.	Signal type	Description
1	Output signal, INFO knob	Turning the INFO knob in one direction grounds ICM pin 11.
2	Output signal, INFO knob	Turning the INFO knob in one direction grounds ICM pin 12.
3	Power supply	Power supply from ICM pin 13
4	Output signal, button press	To ICM pin 14. PWM signal 5V 960Hz square wave with pulse ratio between 10-90%.
5	Output signal, brightness adjustment of instrument lighting	To ICM pin 15. PWM signal 5V 960Hz square wave with pulse ratio between 10-90%.
6	Ground	Ground from ICM pin 16
7	Wake-up signal	Wake-up signal from ICM pin 17

Output signal, INFO knob

Fig 1: Identifying Communication Flow - Output Signal, INFO Knob

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Signal from button push, wake-up signal and ground and power supply

Fig 2: Identifying Communication Flow - Signal From Button Push

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Fig 3: Circuit Diagram - SID Control Panel

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When the INFO knob is not depressed, SIDC sends a PWM signal with pulse width 50% and when it is depressed (SET) to save a value, the pulse width changes to 70%.