IDK MSD-54 Series - Manual (Page 213)

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ON/OFF alternately (blinks).
Ground can only be output when the control command is executed according to the setting of “8.12.7
Command key setting”. Ground is set ON/OFF alternately (blinks) when control commands are executed
according to the setting of “8.12.8 Flash time (Command keys and DISPLAY POWER keys)
”.
*4
The following pins are pulled to ground:
Pins of “MAX” if maximum level is set; “MIN” if minimum level is set; “MUTE” during mute.
*5
Pins are pulled to ground when the MSD is turned on.
*6
Pin is pulled to ground while parallel input is locked.