IDK MSD-5401 User Manual page 220

*8
Pulled to ground when front panel keys are locked.
*9
Pins for the currently available key are pulled to ground.
*10
Pins are pulled to ground when the MSD is turned on.
*11
The channels selected on each pin are pulled to ground, allowing current to flow through them.
Channels of video and audio to be output are independent from the channel switching modes. (If video and
audio channels are not the same when "V&A:OUTn-INn" is selected, channel selection state of video will
be output.)
*12
You can select only pins 22 to 24 and 47 to 49. You can use pins that are set to "PRESET COMMAND" to
control external devices in "8.12 Control Command Settings".
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MSD-54 SERIES User's Guide