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
Re12V 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