Machine Interface
20 MIC (microphone) interface (located on the right side)
It is used to connect attached multi-function handheld microphone.
21 Headphone interface (located on the left side)
It is a 3.5mm stereo socket (3 wires) interface used to connect earphones.
(See Page 5 for the wiring method)
22 Communication interface (located on the left side)
It is used for hardware updating of head unit and the on-line control with
computer.
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Notes: 1. It is required to insert the USB cable into this port for completing
the data communication.
2. Do not insert the cable into this port before startup, otherwise the starting
will become abnormal.
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