Macintosh To Midi Converter (Db-9 Female To Minidin-8 Female); Table A-16 Macintosh To Midi Converter (Db-9 Female): Workstation End; Table A-17 Macintosh To Midi Converter (Minidin-8): Midi Interface End - Silicon Graphics O2+ Hardware Reference Manual

A: Technical Specifications

Macintosh to MIDI Converter (DB-9 Female to MiniDIN-8 Female)

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The Silicon Graphics Macintosh to MIDI converter converts the O2+ workstation's
RS-232 Transmit Data and Receive Data signals to RS-422-like signalling used by MIDI
devices to connect to Apple Macintosh serial ports.
Table A-16 shows the pinouts for the O2+ workstation end.
Table A-16 Macintosh to MIDI Converter (DB-9 Female): Workstation End
Workstation Signal
Description Pin Number
DCD 1
RXD 2
TXD 3
DTR 4
SG 5
DSR 6
RTS 7
CTS 8
RD 9
Table A-17 shows the pinouts for the MIDI interface end.
Table A-17 Macintosh to MIDI Converter (MiniDIN-8): MIDI Interface End
Macintosh Signal
Description
GPi
RXD
TXD
HANDSHAKE OUT
SIGNAL GROUND
HANDSHAKE IN
Voltage with Regard to Ground Required from or Supplied
to Workstation
Passed through from GPi
Supplies 0V typical low, +5V typical high
Requires 0V maximum low, 1.6V minimum high (RS-423)
Requires -12V maximum low to +12V minimum high
0
Not connected
Requires +12V to power the converter
Passed through from handshake in
Not connected
Voltage with Regard to Ground Supplied to or
Pin Number Required from MIDI Interface Unit
7 Passed through to DCD
5(-) and 8 Requires -0.2V maximum low, 0.2V minimum high
32(-) and 6 Supplies -5V typical low, +5V typical high
1 Supplies -5V typical low, +5V typical high
4 0
2 Passed through to DCD
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