Serial Cables and Converters
007-4486-001 205
RS-422 Converter (DB-9 Female) for Video Deck Control
The Silicon Graphics RS-422 converter converts the O2+ workstation’s RS-232 Transmit
Data and Receive Data signals to SMPTE 207M-compatible RS-422 for video deck control.
Table A-14 shows the pinouts for the O2+ workstation end.
Table A-15 shows the pinouts for the video deck end.
Table A-14 RS-422 Converter (DB-9 Female): Workstation End
Workstation Signal
Description Pin Number
Voltage With Regard to Ground Received From or
Supplied to Workstation
DCD 1 Passed through from RS-422 spare
RXD 2 Supplies -5V typical low, +5V typical high (RS-423)
TXD 3 0V maximum low, 1.6V minimum high
DTR 4 Requires -12V maximum low, +12 V minimum high
SG 5 0
DSR 6 Not connected
RTS 7 Requires +12V to power the converter
CTS 8 Not connected
RD 9 Not connected
Table A-15 RS-422 Converter (DB-9 Female): Video Deck End
Video Deck End Signal
Description Pin Number
Voltage
(Across Pair)
Frame GND 1 Not connected
Spare (Priority In) 5 Passed through to workstation DCD
Controller Rcv A&B 2(-) and 7 Requires 0V maximum low, 1.6V minimum high
Controller Xmit A&B 8(-) and 3 Supplies 0V typical low, +5V typical high
Signal GND 4, 6 0
Frame GND 9 Not connected
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