Sony MK7807V1 Manual Book page 140

Interface Processor Others
BKSI-2042
The BKSI-2042 IDC serial interface connector board is
used in conjunction with a BKSI-2040 IDC CPU board
configured as a serial device controller (sub-IDC board).
The BKSI-2042 provides up to six simultaneous RS-232C
or RS-422A control connections, on D-sub 9-pin
connectors, between the SIU-80 interface unit and remote
devices.
Applicable Models
SIU-80 System Interface Unit
BKSI-2043
The BKSI-2043 IDC parallel interface connector board is
used in conjunction with a BKSI-2040 IDC CPU board
configured as a parallel device controller (sub-IDC board).
The BKSI-2043 provides up to 48 input/output
connections (e.g. triggers and tallies), on a D-sub 50-pin
connector, between the SIU-80 interface unit and up to
two remote devices.
Applicable Models
SIU-80 System Interface Unit
IDC Serial I/F Connector Board
IDC Parallel I/F Connector Board
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Rear Panel
Rear Panel