Yamaha MMP1 Setup Manual page 27

REFERENCE: This connection example requires custom cables for connecting MMP1 and
the cough main unit AB-1B. Below is a diagram of the pin assignment for each connector.
Contact Output
Contact Output
Open Collector Output
[MMP1 GPI IN connector and AB-1B CONTROL connector]
[MMP1 GPI OUT connector and AB-1B COMMAND connector】
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Photocoupler
Photocoupler
Photocoupler