Administrator’s Guide for Polycom HDX Systems
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3. Establish a dial-up connection between the computer and the Polycom
HDX system.
a. Connect a null modem adapter to the RS-232 serial port.
b. Connect an RS-232 cable to the modem and to the null modem
adapter.
c. Connect the modem to a phone line.
d. Configure the modem for 8 bits, no parity.
You may need to configure the modem to answer automatically. You may
also need to configure it to ignore DTR signals.
4. On the computer, start the transcription application.
5. Enter text using the stenographic machine connected to the computer.
6. To stop sending closed captions, close the transcription application.
Via the System’s Serial RS-232 Port
Closed captioners can provide captions from inside the conference room,
using equipment connected directly to the serial port of the Polycom HDX
system, as shown in the following diagram.
To supply closed captions using equipment connected directly to the serial port:
1. Ensure that the computer and the Polycom HDX system are configured to
use the same baud rate and parity settings.
2. Go to System > Admin Settings > General Settings > Serial Ports and
set the RS-232 mode to Closed Caption.
3. On the computer, start the transcription application.
4. Enter text using the stenographic machine connected to the computer.
5. To stop sending closed captions, close the transcription application.
Stenograph
machine
PC with computer-aided
transcription software
Polycom
RS-232
Serial
HDX System
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