HD9084 HDTV Caption Encoder Manual
INSTALLATION
Page 2-3
2.1.4.3.
Port C
Port C is a 9-pin male 'D' connector for connection to a computer or captioning equipment. Port C is
used for Control A protocol. The front panel menus are used to set the correct baud rate, word size
and parity for use with your captioning software.
As configured from the factory, the pin-out of this connector is designed for use with a readily available
“null modem” cable to connect to your computer via RS-232 port.
2.1.4.4.
Configuring Ports for RS-232
Ports A, B, and C are configured for RS-232 standard from the factory. Setting the HD9084’s serial
ports to RS-232 is done by first removing the lid and locating the ribbon cables for Ports A (J31),
B(J30), and C(J29) on the motherboard. The connectors are located on the right-hand side of the board
with the front panel facing the user. Next, move the three ribbon connectors to the allocated position
marked “232” on the motherboard and set DIP switch 6, 7 or 8 to the OFF position. Dip 6=Port A, Dip
7=Port B, and Dip 8=Port C. The port(s) are now configured for RS-232.
Serial I/O Port (A, B, C)
Computer End
Male (pins)
Male (pins)
Description
DB-9
DB-25
DB-9
Description
Shield
Shield
RS 232 Transmit
3
3
2
RS 232 Receive
Ground
5
7
5
Signal Ground
RS 232 Receive
2
2
3
RS 232 Transmit
RS 232 CTS
8
4
7
RS 232 RTS
RS 232 DTR
4
6
6
RS 232 DSR
RS 232 RTS
7
5
8
RS 232 CTS
RS 232 DSR
6
20
4
RS 232 DTR
Figure 2-2: Wiring RS-232 DTE Serial Port to Computer
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