Model: 555
Standard wiring:
1-Shield
2-Audio
3-Transmit
4-Receive


Astatic wiring:
1-Shield and Blue
2-White
3-Red
4-Black
Yellow-N/C


Sadelta:
1-Shield
2-White
3-Brown
4-Green


Tuner:
1-Shield and Red
2-White
3-Blue
4-Black
Yellow-N/C